@inproceedings{ItzerottKaden2006,
author = {Itzerott, Sibylle and Kaden, Klaus},
title = {Zur G{\"u}te der automatisierten Erkennung von Ackerkulturen in Abh{\"a}ngigkeit vom Bodenmuster : Projektergebnisse und weiterf{\"u}hrende Ans{\"a}tze},
url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7031},
year = {2006},
abstract = {Problemstellung • Geo{\"o}kologische Prozessforschung versucht f{\"u}r große Landschaftsausschnitte, die in der Natur ablaufenden und vom Menschen beeinflussten Prozesse mit Hilfe von Modellen nachzuvollziehen • exakte Erfassung der Ausstattung des Untersuchungsraumes ist wesentliche Voraussetzung f{\"u}r eine wirklichkeitsnahe Abbildung • Modelle derzeit weder in der Lage, alle ablaufenden Prozesse in die Betrachtung einzubeziehen, noch pr{\"a}zise Eingangsdaten bei der Beschreibung des Ausgangszustandes zu verarbeiten • h{\"a}ufig liegen Modelleingangsdaten nicht in der notwendigen Pr{\"a}zision vor • In Modellen wird Ausstattung eines Untersuchungsgebietes {\"u}ber den Boden, den Grundwassereinfluss und die Fl{\"a}chennutzung beschrieben • Fl{\"a}chennutzung besitzt weitgehend statische Elemente (Nutzungstypen Wald, Gew{\"a}sser, Siedlung) und hochdynamische Elemente (j{\"a}hrlicher Wechsel der Fruchtart auf jedem Acker) • Bedarf nach detaillierter (lage- und zeitkonkreter) Eingabe der Verteilung der Ackerfr{\"u}chte im Modellzeitraum, da Landwirtschaft als eine der bedeutenden Quellen f{\"u}r diffusen N{\"a}hrstoffeintrag ins {\"O}kosystem angesehen wird Stand der Forschung • bei Erfassung von Kulturen der Landwirtschaft aus Fernerkundungsdaten hat sich multitemporale Klassifizierung als sinnvoll erwiesen, weil sich anhand einer Einzelaufnahme die verschiedenen Kulturen nicht sicher trennen lassen • Klassifizierung erfolgt mit {\"u}berwachten Methoden unter Verwendung von Trainingsfl{\"a}chen im Datensatz, von denen die dort angebaute Frucht bekannt ist • in die Klassifizierung werden zus{\"a}tzliche Informationen einbezogen (Fuzzy), die Auskunft {\"u}ber die Wahrscheinlichkeit des Auftretens der Frucht geben (Anbaueignung in Abh{\"a}ngigkeit von Hangneigung, Niederschlag, H{\"o}henlage, Boden) Die Ergebnisse dieser Klassifikationen sind meist nicht auf andere Landschaftsausschnitte und Anbaujahre {\"u}bertragbar, weil die Auspr{\"a}gung der Spektralsignatur einer Kultur durch ver{\"a}nderte Boden- und Witterungsbedingungen variiert. L{\"o}sungsansatz • auf Basis von Satellitendaten und Anbauinformationen aus 15 aufeinander folgenden Jahren (35 Aufnahmetermine) sollten von Witterung und Boden unabh{\"a}ngige Jahreskurven der spektralen Charakteristik wichtiger Ackerkulturen gewonnen werden, die den Wachstumsverlauf der Pflanzen beschreiben • diese Kurven sollen anstelle von Trainingsgebieten zur multitemporalen Klassifizierung von Daten eines Anbaujahres herangezogen werden Schlussfolgerungen und Ausblick • Prinzipiell erscheint Vorgehen erfolgreich, jedoch in Abh{\"a}ngigkeit von der Brauchbarkeit der herangezogenen Szenen schwankt G{\"u}te des Ergebnisses noch • Verfahren stellt wesentlichen Fortschritt zu bisherigem Vorgehen auf Trainingsfl{\"a}chenbasis dar • ist zumindest im Untersuchungsgebiet immer wieder ohne weitere Kenntnis von Anbauinformationen anwendbar, lediglich exakte ph{\"a}nologische Datierung der dann verwendeten Aufnahmen erforderlich • f{\"u}r andere Gebiete (Variation in Niederschlag und Boden) ist Anpassung der ph{\"a}nologischen Datierung der Kurven erforderlich (Form ist weiter verwendbar) • optimale Bildkombination zur Trennung aller Kulturen ist: Anfang/Mitte April - Mitte Mai - Anfang Juli - Mitte August - Mitte September • Kombination sollte bei verbesserter Verf{\"u}gbarkeit von Daten beschaffbar sein • problematisch scheinen Trockensituationen im Mai und Juni zu sein, so dass zu schnell reifende Wintergetreide nicht richtig erkannt werden, Bedarf Bodeninformationen einzubeziehen • Trennung von Hackfr{\"u}chten weiterhin problematisch (wie schon in bisherigen Verfahren), f{\"u}hrt zu {\"u}berm{\"a}ßigen Anteilen im Ergebnis, in Abh{\"a}ngigkeit vom Anbauanteil besser vernachl{\"a}ssigen • Einbeziehung von Fuzzyinformationen erscheint sinnvoll • Zusammenhang von Bodeng{\"u}te und Frucht (Anbaueignung eines Bodens f{\"u}r eine Frucht) • Wasserverf{\"u}gbarkeit am Standort (in Abh{\"a}ngigkeit von Speicherverm{\"o}gen des Bodens, Grundwasseranschluss und Niederschlag) • Summe der Niederschl{\"a}ge bis zum Aufnahmezeitpunkt (Trockenheitsindex)
Dokument 1: Foliensatz | Dokument 2: Abstract
Interdisziplin{\"a}res Zentrum f{\"u}r Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006},
language = {de}
}
@article{Heller2006,
author = {Heller, Wilfried},
title = {Zur Bedeutung von Ethnizit{\"a}t in Transformationsl{\"a}ndern unter dem Einfluss von Globalisierung},
editor = {Sallanz, Josef},
year = {2006},
language = {de}
}
@article{GermerElsenbeerdeMoraes2006,
author = {Germer, Sonja and Elsenbeer, Helmut and de Moraes, Jorge M.},
title = {Throughfall and temporal trends of rainfall redistribution in an open tropical rainforest, south-western Amazonia (Rond{\^o}nia, Brazil)},
issn = {1027-5606},
doi = {10.5194/hess-10-383-2006},
year = {2006},
language = {en}
}
@article{ZimmermannElsenbeerdeMoraes2006,
author = {Zimmermann, Beate and Elsenbeer, Helmut and de Moraes, Jorge M.},
title = {The influence of land-use changes on soil hydraulic properties : implications for runoff generation},
issn = {0378-1127},
doi = {10.1016/j.foreco.2005.10.070},
year = {2006},
language = {en}
}
@article{Heller2006,
author = {Heller, Wilfried},
title = {Studienreform im Lichte des Bologna-Prozesses (mit dem Beispiel Geographie der Universit{\"a}t Potsdam)},
year = {2006},
language = {de}
}
@article{SommerKaczorekKuzyakovetal.2006,
author = {Sommer, Michael and Kaczorek, Danuta and Kuzyakov, Yakov and Breuer, J{\"o}rn},
title = {Silicon pools and fluxes in soils and landscapes : a review},
year = {2006},
abstract = {Silicon (Si) is the second-most abundant element in the earth's crust. In the pedosphere, however, huge spans of Si contents occur mainly caused by Si redistribution in soil profiles and landscapes. Here, we summarize the current knowledge on the different pools and fluxes of Si in soils and terrestrial biogeosystems. Weathering and subsequent release of soluble Si may lead to (1) secondarily bound Si in newly formed Al silicates, (2) amorphous silica precipitation on surfaces of other minerals, (3) plant uptake, formation of phytogenic Si, and subsequent retranslocation to soils, (4) translocation within soil profiles and formation of new horizons, or (5) translocation out of soils (desilication). The research carried out hitherto focused on the participation of Si in weathering processes, especially in clay neoformation, buffering mechanisms for acids in soils or chemical denudation of landscapes. There are, however, only few investigations on the characteristics and controls of the low-crystalline, almost pure silica compounds formed during pedogenesis. Further, there is strong demand to improve the knowledge of (micro)biological and rhizosphere processes contributing to Si mobilization, plant uptake, and formation of phytogenic Si in plants, and release due to microbial decomposition. The contribution of the biogenic Si sources to Si redistribution within soil profiles and desilication remains unknown concerning the pools, rates, processes, and driving forces. Comprehensive studies considering soil hydrological, chemical, and biological processes as well as their interactions at the scale of pedons and landscapes are necessary to make up and model the Si balance and to couple terrestrial processes with Si cycle of limnic, fluvial, or marine biogeosystems},
language = {en}
}
@article{SzaramowiczJessel2006,
author = {Szaramowicz, Martin and Jessel, Beate},
title = {Regionale Fl{\"a}chenpools in der Praxis},
year = {2006},
language = {de}
}
@article{SchatzabelMeyer2006,
author = {Schatzabel, Hartmut and Meyer, S.},
title = {Reality, system, model, prediction : the modeling approach},
year = {2006},
language = {en}
}
@article{BlumensteinVanRensburgKruegeretal.2006,
author = {Blumenstein, Oswald and Van Rensburg, L. and Kr{\"u}ger, Wolfgang and Schachtzabel, Hartmut},
title = {Preface},
year = {2006},
language = {en}
}
@article{HennenbergFischerKouadioetal.2006,
author = {Hennenberg, K. J. and Fischer, Franka and Kouadio, K and Goetze, D and Orthmann, B and Linsenmair, KE and Jeltsch, Florian and Porembski, Stefan},
title = {Phytornass and fire occurrence along forest-savanna transects in the Comoe National Park, Ivory Coast},
issn = {0266-4674},
doi = {10.1017/S026646705003007},
year = {2006},
abstract = {In tropical West Africa, distribution patterns of forest islands in savannas are influenced by fires which occur regularly in the grass stratum. Along continuous forest-savanna transects in the Comoe National Park, the change in the amount and composition of non-woody phytomass was investigated from savanna to forest interior. This was correlated with the cover of vegetation strata above, soil depth, and the occurrence of seasonal surface fires. Phytomass mainly consisted of leaf litter in the forests (about 400 g m(-2) at the end of the rainy season, and about 600 g m(-2) at the end of the dry season) and of grasses in the savanna (about 900 g m(-2)). Low grass biomass appeared to be primarily the result of suppression by competing woody species and not of shallow soil. The occurrence of early dry-season fires seemed to be determined mainly by the amount of grass biomass as fuel because fires occurred in almost all savanna plots while forest sites remained unaffected. However, late dry-season fires will encounter higher amounts of leaf litter raising fire probability in forests. Due to the importance of the amount of combustible phytomass, fire probability and intensity might increase with annual precipitation in both savanna and forest},
language = {en}
}
@article{SeppeltSchroeder2006,
author = {Seppelt, Ralf and Schr{\"o}der, Boris},
title = {Pattern and processes of dynamic mosaic landscapes},
series = {Ecological modelling : international journal on ecological modelling and engineering and systems ecolog},
volume = {199},
journal = {Ecological modelling : international journal on ecological modelling and engineering and systems ecolog},
number = {4},
publisher = {Elsevier},
address = {Amsterdam},
issn = {0304-3800},
doi = {10.1016/j.ecolmodel.2006.06.011},
pages = {377 -- 378},
year = {2006},
language = {en}
}
@inproceedings{KuehlingMaerkerZehe2006,
author = {K{\"u}hling, Matthias and M{\"a}rker, Michael and Zehe, Erwin},
title = {Musterdynamik und Fernerkundung in der D{\"o}beritzer Heide : [Poster]},
editor = {Gzik, Axel and Hochschild, Volker and Schneider, Ingo and Schr{\"o}der, Boris},
url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7277},
year = {2006},
abstract = {Mit der politischen Wende in den Staaten des ehemaligen Ostblockes wurde f{\"u}r viele milit{\"a}risch genutzte Fl{\"a}chen ein tiefgreifender Nutzungswandel eingeleitet. Truppen{\"u}bungspl{\"a}tze als stark gest{\"o}rte Bestandteile unserer Kulturlandschaft weisen auf großen Fl{\"a}chen naturschutzfachlich wertvolle Habitatmosaike mit speziellen Lebensgemeinschaften auf. Der Nutzungswandel ist mit einer Ver{\"a}nderung der Vegetationsstrukturen (Sukzession) und weiteren landschafts{\"o}kologischen Prozessen verbunden. Der ehemalige Truppen{\"u}bungsplatz D{\"o}beritz im Norden der Landeshauptstadt Potsdam kann auf eine lange milit{\"a}rische Nutzungsgeschichte verweisen (erste Man{\"o}ver des Soldatenk{\"o}nigs im Jahr 1713). Nach 1992 wurden das NSG D{\"o}beritzer Heide (3.415 ha) und das NSG Ferbitzer Bruch (1.155 ha) ausgewiesen. Als Schutzgebiete nach der Vogelschutzrichtlinie sind sie Bestandteile des koh{\"a}renten Schutzgebietssystems Natura 2000 der europ{\"a}ischen Gemeinschaft. Trotz des Schutzstatus und der milit{\"a}rischen Altlasten unterliegt das Gebiet als gr{\"o}ßte zusammenh{\"a}ngende Naturfl{\"a}che im engeren Verflechtungsraum des Landes Brandenburg einem hohen Nutzungsdruck.
Interdisziplin{\"a}res Zentrum f{\"u}r Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006},
language = {de}
}
@misc{vondemBussche2006,
type = {Master Thesis},
author = {von dem Bussche, Jens},
title = {Modelling the spatial distribution of blackbird (Turdus merula) and ring ouzel (Turdus torquatus) in Switzerland},
url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-14012},
school = {Universit{\"a}t Potsdam},
year = {2006},
abstract = {To characterise the habitat preferences of ring ouzel (Turdus torquatus) and blackbird (T. merula) in Switzerland, we adopt species distribution modelling and predict the species' spatial distribution. We model on two different scales to analyse in how far downscaling leads to a different set of predictors to describe the realised habitat best. While the models on macroscale (grid of one square kilometre) cover the entire country, we select a set of smaller plots for modelling on territory scale. Whereas ring ouzels occur in altitudes above 1'000 m a.s.l. only, blackbirds occur from the lowlands up to the timber line. The altitudinal range overlap of the two species is up to 400 m. Despite both species coexist on macroscale, a direct niche overlap on territory scale is rare. Small-scale differences in vegetation cover and structure seem to play a dominant role for habitat selection. On macroscale however, we observe a high dependency on climatic variables mainly representing the altitudinal range and the related forest structure preferred by the two species. Applying the models for climate change scenarios, we predict a decline of suitable habitat for the ring ouzel with a simultaneous median altitudinal shift of +440 m until 2070. In contrast, the blackbird is predicted to benefit from higher temperatures and expand its range to higher elevations.},
language = {en}
}
@article{TietjenHuth2006,
author = {Tietjen, Britta and Huth, Andreas},
title = {Modelling dynamics of managed tropical rainforests - An aggregated approach},
series = {Ecological modelling : international journal on ecological modelling and engineering and systems ecolog},
volume = {199},
journal = {Ecological modelling : international journal on ecological modelling and engineering and systems ecolog},
number = {4},
publisher = {Elsevier},
address = {Amsterdam},
issn = {0304-3800},
doi = {10.1016/j.ecolmodel.2005.11.045},
pages = {421 -- 432},
year = {2006},
abstract = {The overuse of rainforests in the last century and its consequences necessitate a rethinking of logging policies. To this end models have been developed to simulate rainforest dynamics and to allow optional management strategies to be evaluated. Parameterisation of presently existing models for a certain site needs a lot of work, thus the parameterisation effort is too high to apply the models to a wide range of rainforests. Hence, in this paper we introduce the simplified model FORREG using the knowledge we have gained from a more complex model, FORMIX3-Q. The FORREG model uses differential equations to determine the volume growth of three successional species groups. Parameterisation is simplified by a genetic algorithm, which determines the required internal model parameters from characteristics of the forest dynamics. The new model is employed to assess the sustainability of various logging policies in terms of yield and damage. Results for three forests are discussed: (1) the tropical lowland rain forest in the Deramakot Forest Reserve, (2) the Lambir National Park in Malaysia and (3) a subtropical forest in Paraguay. Our model reproduces both undisturbed forest dynamics and dynamics of logged forests simulated with FORMIX3-Q very well. However, the resultant volumes of yield and damage differ slightly from those gained by FORMIX3-Q if short logging cycles are simulated. Choosing longer logging cycles leads to a good correspondence of both models. For the Deramakot Forest Reserve different logging cycles are compared and discussed. (c) 2006 Elsevier B.V. All rights reserved.},
language = {en}
}
@article{DeAraujoGuentnerBronstert2006,
author = {De Araujo, Jos{\`e} Carlos and G{\"u}ntner, Andreas and Bronstert, Axel},
title = {Loss of reservoir volume by sediment deposition and its impact on water availability in semiarid Brazil},
issn = {0262-6667},
doi = {10.1623/hysj.51.1.157},
year = {2006},
abstract = {A methodology is presented to assess the impact of reservoir silting oil water availability for semiarid environments, applied to seven representative watersheds in the state of Ceara, Brazil. Water yield is computed using stochastic modelling for several reliability levels and water yield reduction is quantified for the focus areas. The yield-volume elasticity concept, which indicates the relative yield reduction in terms of relative storage capacity of the reservoirs, is presented and applied. Results chow that storage capacity was reduced by 0.2\% year(-1) due to silting, that the risk of water shortage almost doubled in less than 50 years for the most critical reservoir, and that reduction of storage capacity had three times more impact oil yield reduction than the increase in evaporation. Average 90\% reliable yield-volume elasticity was 0.8, which means that the global water yield (Q(90)) in Ceara is expected to diminish yearly by 388 L s(-1) due to reservoir silting},
language = {en}
}
@misc{Clausing2006,
type = {Master Thesis},
author = {Clausing, Thomas},
title = {Landschaftszerschneidung : Anwendung und Vergleich verschiedener methodischer Varianten am Beispiel des Landkreises Havelland (Brandenburg)},
url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-13656},
school = {Universit{\"a}t Potsdam},
year = {2006},
abstract = {Analyse der Landschaftszerschneidung und -fragmentierung, Untersuchung und Anwendung verschiedener Zerschneidungsgeometrien und deren Implementierung f{\"u}r unterschiedliche Indikatoren. Die Ergebnisse des methodischen Vergleiches f{\"u}r den Landkreis Havelland sollen die Grundlage f{\"u}r die Auswahl der geeignetesten Methode bei einer landesweite Untersuchung in Brandenburg liefern.},
language = {de}
}
@book{GeldmacherKruegerGerickeetal.2006,
author = {Geldmacher, Karl and Kr{\"u}ger, Wolfgang and Gericke, Andreas and Blumenstein, Oswald and Guo, Jianbin H. and Tang, Xilin},
title = {Landschaftswandel im Turbotempo : Geo{\"o}kologische Probleme des Guanting Beckens (VR China)},
series = {Stoffdynamik in Geosystemen},
volume = {13},
journal = {Stoffdynamik in Geosystemen},
editor = {Blumenstein, Oswald and Kr{\"u}ger, Wolfgang and Schachtzabel, Hartmut},
publisher = {Selbstverl. der Arbeitsgruppe Stoffdynamik in Geosystemen},
address = {Potsdam},
issn = {0949-4731},
pages = {110 S.},
year = {2006},
language = {de}
}
@book{Geldmacher2006,
author = {Geldmacher, Karl},
title = {Landschaftsentwicklung und Landnutzungswandel im Pazifischen Nordwesten der USA seit 1850},
series = {Stoffdynamik in Geosystemen},
volume = {12},
journal = {Stoffdynamik in Geosystemen},
publisher = {Selbstverl. der Arbeitsgruppe Stoffdynamik in Geosystemen},
address = {Potsdam},
issn = {0949-4731},
pages = {113 S.},
year = {2006},
language = {de}
}
@inproceedings{Bronstert2006,
author = {Bronstert, Axel},
title = {Interdisziplin{\"a}res Zentrum f{\"u}r Musterdynamik und angewandte Fernerkundung (IMAF) an der Universit{\"a}t Potsdam : Gegenwart und Zukunft},
url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7021},
year = {2006},
abstract = {Stand des IMAF zu Beginn des Jahres 2006 Zum 1. April 2005 wurde per Beschluss des Rektorats der Universit{\"a}t Potsdam das Interdisziplin{\"a}re Zentrum f{\"u}r Musterdynamik und Angewandte Fernerkundung (IMAF) an der Universit{\"a}t Potsdam eingerichtet. Diesem Beschluss gingen knapp zwei Jahre konzeptionelle, organisatorische und administrative Vorarbeiten voraus. Inzwischen ist das IMAF also offiziell gegr{\"u}ndet, der Vorstand wurde „bestellt" (Prof. M. Mutti. Prof. E. Zehe, Prof. A. Bronstert), der Gesch{\"a}ftsf{\"u}hrer bzw. wissenschaftliche Koordinator Dr. M. K{\"u}hling arbeitet in dieser Funktion seit Sommer 2005 und seit kurzem ist auch die 1. Version der Homepage des IMAF (http://www.uni-potsdam.de/imaf/) frei geschaltet. Auch die Infrastruktur des IMAF ist in der Entstehungsphase: B{\"u}ror{\"a}ume sind versprochen (wenn auch noch nicht bezugsfertig) im Haus 13 auf dem Campus Golm der Universit{\"a}t Potsdam und der 1. erfolgreiche Drittmittelantrag erbrachte 8 leistungsf{\"a}hige Tischrechner und einen Server f{\"u}r das IMAF aus EU-Mitteln. Wichtiger als die administrativen und organisatorischen Arbeiten sind aber die inhaltlichen Forstschritte. Hier ist die große Resonanz, die die Gr{\"u}ndung des IMAF sowohl innerhalb als auch außerhalb der Universit{\"a}t gefunden hat, besonders erfreulich. {\"U}ber 30 Angeh{\"o}rige des Zentrums sind inzwischen zu verzeichnen und es gibt bereits eine Reihe von wissenschaftlichen Projektinitiativen und Ideen f{\"u}r dieses Zentrum. Neben den wissenschaftlichen Arbeiten am IMAF ist ein zweites Hauptziel f{\"u}r dieses Zentrum die Entwicklung und der Ausbau eines strukturierten Ausbildungsangebotes f{\"u}r Musterdynamik und angewandte Fernerkundung. Dies sollen gleichermaßen Masterstudenten als auch Doktoranden der Universit{\"a}t Potsdam und der mit ihr assoziierten außeruniversit{\"a}ren Institute nutzen. Zudem werden Kurse und Weiterbildungsveranstaltungen mit nationalen und internationalen Experten angestrebt. Neben diesen positiven Entwicklungen gibt es auch (noch ??) {\"u}ber einige M{\"a}ngel zu berichten: Das Sekretariat ist nach wie vor unbesetzt, die Finanzausstattung des Zentrums ist v{\"o}llig ungen{\"u}gend und die im Konzept f{\"u}r das Zentrum beantragte Wissenschaftlerstelle f{\"u}r Softwareanwendung ist nicht in Sicht. F{\"u}r einen Erfolg des Zentrums ist es unbedingt notwendig, dass sich diese Situation deutlich verbessert!! Forschungsschwerpunkte des IMAF R{\"a}umliche Muster und deren Struktur in der Umwelt R{\"a}umliche Muster sind in vielen naturwissenschaftlichen Disziplinen (Hydrologie, {\"O}kologie, Geologie, Biologie, Chemie, Physik) von zentraler Bedeutung. Z.B. bestimmen die r{\"a}umlichen (und zeitlichen) Muster von Bodeneigenschaften und Vegetation in ihrem Zusammenspiel mit den Mustern von Niederschlag und Strahlungsinput maßgeblich den Wasser- und Stoffhaushalt auf unterschiedlichsten Skalen und f{\"u}hren {\"u}ber R{\"u}ckkopplung wiederum zu Ver{\"a}nderungen in Klima, Vegetation und {\"O}kosystemen. Vom kleinr{\"a}umigen Transport von Schadstoffen und von der Hochwasserentstehung bis zur Frage nach den regionalen und globalen Ver{\"a}nderungen von Klima, Vegetation und Landnutzung seien hier nur einige Problemkreise genannt, in denen Muster und Musterdynamik eine zentrale Stellung einnehmen. Dar{\"u}ber hinaus liefert die Betrachtung der zeitlichen Ver{\"a}nderung von r{\"a}umlichen Mustern, in Erg{\"a}nzung zur klassischen Erfassung dynamischer Prozesse in Form von Messungen lokaler zeitlicher {\"A}nderungen, eine v{\"o}llig neue Perspektive auf Dynamik und er{\"o}ffnet damit v{\"o}llig neue wissenschaftliche M{\"o}glichkeiten. Aktuelle und sehr dr{\"a}ngende Fragen innerhalb dieses Forschungsschwerpunktes sind unter anderem: • Analyse der generelle Raumstruktur von Geodaten (Variabilit{\"a}t, Struktur, Konnektivit{\"a}t); • Thematische Verbindungen verschiedener Datenebenen und M{\"o}glichkeiten f{\"u}r deren Assimilation; • M{\"o}glichkeiten und Grenzen des Skalen{\"u}bergangs zwischen verschiedenen r{\"a}umlichen Aufl{\"o}sungen und Informationsquellen; • Ableitung der zeitlichen Dynamik bzw. Entwicklung von großen fl{\"a}chenhaften Datenfeldern. Angewandte Fernerkundung Wie keine andere Technik bietet die Fernerkundung in jeglicher Form (unter anderem Satelliten, flugzeuggetragene Sensoren, Wetterradar und auch geophysikalische Methoden) umfangreiche M{\"o}glichkeiten, r{\"a}umliche Muster und deren zeitliche Ver{\"a}nderungen zu erfassen. Allen Methoden der Fernerkundung gemein ist, dass sie nur indirekte Ergebnisse liefern. Das heißt, es besteht nur ein mittelbarer Zusammenhang zwischen dem beobachteten Signal, meist der Reflektivit{\"a}t oder Emissivit{\"a}t elektromagnetischer Strahlung in verschiedenen Spektralbereichen (optisch oder Radar), und der eigentlich interessierenden Gr{\"o}ße, wie dem Feuchtezustand der Vegetation, der Bodenfeuchte oder Bodenrauhigkeit, der Niederschlagsintensit{\"a}t, dem Zustand der Schneedecke oder der Ausdehnung eines Oberfl{\"a}chenfilms auf Gew{\"a}ssern. Ein Satellitenbild enth{\"a}lt beispielsweise immer die spektrale Signatur des r{\"a}umlichen Musters mehrerer der oben genannten Einflussgr{\"o}ßen, was die Extraktion oder Diskriminierung der eigentlich interessierenden Gr{\"o}ße erschwert. Dieser „vermischte" Charakter der Fernerkundungsdaten bietet aber auch immense Chancen. So lassen sich durch geeignete Interpretationsverfahren aus jedem mit hohem finanziellem und technischem Aufwand erstellten Satellitenbild zahlreiche und im Detail v{\"o}llig unterschiedliche Fragestellungen bearbeiten. Die Extraktion der gew{\"u}nschten Information aus dem Fernerkundungssignal f{\"u}hrt mathematisch gesehen meist auf die L{\"o}sung so genannter inverser, schlecht gestellter Probleme. Somit beinhaltet die interdisziplin{\"a}re Nutzung von Fernerkundung auch ein hohes methodisches Synergiepotential. Durch die heutigen technischen M{\"o}glichkeiten zur Archivierung auch sehr umfangreicher raumbezogener Informationen ist die Bearbeitung zu jedem beliebigen Zeitpunkt nach der Aufnahme m{\"o}glich - zum Beispiel bis entsprechend lange Zeitreihen und/oder geeignete Interpretationsverfahren zur Verf{\"u}gung stehen. Tats{\"a}chlich d{\"u}rfte der weitaus gr{\"o}ßte Teil der raumbezogenen Informationen, die in den bisher erhobenen Fernerkundungsdaten stecken, nur in Ans{\"a}tzen ausgewertet sein. Einer bereits sehr hoch entwickelten technischen Dimension der Fernerkundung steht ein gewisses Defizit im Umfang ihrer Anwendung in den verschiedenen naturwissenschaftlichen Disziplinen gegen{\"u}ber. Aktuelle und sehr dr{\"a}ngende Fragen innerhalb dieses Forschungsschwerpunktes sind unter anderem: • Nutzung der r{\"a}umlichen und inhaltlichen Breite von Fernerkundungsinformationen; • Verbindung mit automatisierten, u.a. geophysikalischen Methoden des „ground-truthings"; • Identifizierung der Grenzen bzgl. Repr{\"a}sentanz der Daten (spektral, raum-zeitliche Aufl{\"o}sung); • Verbindung unterschiedlicher Methoden der Fernerkundung und der Geophysik. Dieser Beitrag illustriert die o.g. Fragestellungen anhand einiger Darstellungen aus verschiedenen wissenschaftlichen Disziplinen und erl{\"a}utert 2 Beispiele zu beabsichtigten Forschungsprojekten: • Erfassung und Bedeutung von Boden-Oberfl{\"a}cheneigenschaften auf die Abflussbildung von Landschaften; • Ph{\"a}nomene des Stofftransportes in homogenen vs. heterogenen B{\"o}den.},
language = {de}
}
@phdthesis{Post2006,
author = {Post, Joachim},
title = {Integrated process-based simulation of soil carbon dynamics in river basins under present, recent past and future environmental conditions},
url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-11507},
school = {Universit{\"a}t Potsdam},
year = {2006},
abstract = {Soils contain a large amount of carbon (C) that is a critical regulator of the global C budget. Already small changes in the processes governing soil C cycling have the potential to release considerable amounts of CO2, a greenhouse gas (GHG), adding additional radiative forcing to the atmosphere and hence to changing climate. Increased temperatures will probably create a feedback, causing soils to release more GHGs. Furthermore changes in soil C balance impact soil fertility and soil quality, potentially degrading soils and reducing soils function as important resource. Consequently the assessment of soil C dynamics under present, recent past and future environmental conditions is not only of scientific interest and requires an integrated consideration of main factors and processes governing soil C dynamics. To perform this assessment an eco-hydrological modelling tool was used and extended by a process-based description of coupled soil carbon and nitrogen turnover. The extended model aims at delivering sound information on soil C storage changes beside changes in water quality, quantity and vegetation growth under global change impacts in meso- to macro-scale river basins, exemplary demonstrated for a Central European river basin (the Elbe). As a result this study: ▪ Provides information on joint effects of land-use (land cover and land management) and climate changes on croplands soil C balance in the Elbe river basin (Central Europe) presently and in the future. ▪ Evaluates which processes, and at what level of process detail, have to be considered to perform an integrated simulation of soil C dynamics at the meso- to macro-scale and demonstrates the model's capability to simulate these processes compared to observations. ▪ Proposes a process description relating soil C pools and turnover properties to readily measurable quantities. This reduces the number of model parameters, enhances the comparability of model results to observations, and delivers same performance simulating long-term soil C dynamics as other models. ▪ Presents an extensive assessment of the parameter and input data uncertainty and their importance both temporally and spatially on modelling soil C dynamics. For the basin scale assessments it is estimated that croplands in the Elbe basin currently act as a net source of carbon (net annual C flux of 11 g C m-2 yr-1, 1.57 106 tons CO2 yr-1 entire croplands on average). Although this highly depends on the amount of harvest by-products remaining on the field. Future anticipated climate change and observed climate change in the basin already accelerates soil C loss and increases source strengths (additional 3.2 g C m-2 yr-1, 0.48 106 tons CO2 yr-1 entire croplands). But anticipated changes of agro-economic conditions, translating to altered crop share distributions, display stronger effects on soil C storage than climate change. Depending on future use of land expected to fall out of agricultural use in the future (~ 30 \% of croplands area as "surplus" land), the basin either considerably looses soil C and the net annual C flux to the atmosphere increases (surplus used as black fallow) or the basin converts to a net sink of C (sequestering 0.44 106 tons CO2 yr-1 under extensified use as ley-arable) or reacts with decrease in source strength when using bioenergy crops. Bioenergy crops additionally offer a considerable potential for fossil fuel substitution (~37 PJ, 1015 J per year), whereas the basin wide use of harvest by-products for energy generation has to be seen critically although offering an annual energy potential of approximately 125 PJ. Harvest by-products play a central role in soil C reproduction and a percentage between 50 and 80 \% should remain on the fields in order to maintain soil quality and fertility. The established modelling tool allows quantifying climate, land use and major land management impacts on soil C balance. New is that the SOM turnover description is embedded in an eco-hydrological river basin model, allowing an integrated consideration of water quantity, water quality, vegetation growth, agricultural productivity and soil carbon changes under different environmental conditions. The methodology and assessment presented here demonstrates the potential for integrated assessment of soil C dynamics alongside with other ecosystem services under global change impacts and provides information on the potentials of soils for climate change mitigation (soil C sequestration) and on their soil fertility status.},
subject = {Kohlenstoff},
language = {en}
}
@article{WiggeringDalchowGlemnitzetal.2006,
author = {Wiggering, Hubert and Dalchow, Claus and Glemnitz, Michael and Helming, Katharina and M{\"u}ller, Klaus and Schultz, Alfred and Stachow, Ulrich and Zander, Peter},
title = {Indicators for multifunctional land use : linking socio-economic requirements with landscape potentials},
year = {2006},
abstract = {Indicators to assess sustainable land development often focus on either economic or ecologic aspects of landscape use. The concept of multifunctional land use helps merging those two focuses by emphasising on the rule that economic action is per se accompanied by ecological utility: commodity outputs (CO, e.g., yields) are paid for on the market, but non-commodity outputs (NCO, e.g., landscape aesthetics) so far are public goods with no markets. Agricultural production schemes often provided both outputs by joint production, but with technical progress under prevailing economic pressure, joint production increasingly vanishes by decoupling of commodity from non-commodity production. Simultaneously, by public and political awareness of these shortcomings, there appears a societal need or even demand for some non-commodity outputs of land use, which induces a market potential, and thus, shift towards the status of a commodity outputs. An approach is presented to merge both types of output by defining an indicator of social utility (SUMLU): production schemes are considered with respect to social utility of both commodity and non-commodity outputs. Social utility in this sense includes environmental and economic services as long as society expresses a demand for them. For each combination of parameters at specific frame conditions (e.g., soil and climate properties of a landscape) a production possibility curve can reflect trade-offs between commodity and non-commodity outputs. On each production possibility curve a welfare optimum can be identified expressing the highest achievable value of social utility as a trade-off between CO and NCO production. When applying more parameters, a cluster of welfare optimums is generated. Those clusters can be used for assessing production schemes with respect to sustainable land development. Examples of production possibility functions are given on easy applicable parameters (nitrogen leaching versus gross margin) and on more complex ones (biotic integrity). Social utility, thus allows to evaluate sustainability of land development in a cross-sectoral approach with respect to multifunctionality. (C) 2005 Elsevier Ltd. All rights reserved},
language = {en}
}
@article{SchulzSeppeltZeheetal.2006,
author = {Schulz, K. and Seppelt, Ralf and Zehe, Erwin and Vogel, Hans-J{\"o}rg and Attinger, Sabine},
title = {Importance of spatial structures in advancing hydrological sciences},
doi = {10.1029/2005wr004301},
year = {2006},
abstract = {[1] Spatial patterns of land surface and subsurface characteristics often exert significant control over hydrological processes at many scales. Recognition of the dominant controls at the watershed scale, which is a prerequisite to successful prediction of system responses, will require significant progress in many different research areas. The development and improvement of techniques for mapping structures and spatiotemporal patterns using geophysical and remote sensing techniques would greatly benefit watershed science but still requires a significant synthesis effort. Effective descriptions of hydrological systems will also significantly benefit from new scaling and averaging techniques, from new mathematical description for spatial pattern/structures and their dynamics, and also from an understanding and quantification of structure and pattern-building processes in different compartments ( soils, rocks, and land surface) and at different scales. The advances that are needed to tackle these complex challenges could be greatly facilitated through the development of an interdisciplinary research framework that explores instrumentation, theory, and simulation components and that is implemented in a coordinated manner},
language = {en}
}
@article{NeillElsenbeerKruscheetal.2006,
author = {Neill, Christopher and Elsenbeer, Helmut and Krusche, Alex V. and Lehmann, Johannes and Markewitz, Daniel and Figueiredo, Ricardo de O.},
title = {Hydrological and biogeochemical processes in a changing Amazon : results from small watershed studies and the large-scale biosphere-atmosphere experiment},
doi = {10.1002/Hyp.6210},
year = {2006},
abstract = {The Amazon Basin is the world's largest tropical forest region and one where rapid human changes to land cover have the potential to cause significant changes to hydrological and biogeochemical processes. The Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA) is a multidisciplinary, multinational research program led by Brazil. The goal of LBA is to understand how the Amazon Basin functions as a regional entity in the earth system and how these functions are changing as a result of ongoing human activity. This compilation of nine papers focuses on a central LBA question in the area of nutrient dynamics and surface water chemistry-how do changes in land use alter fluxes of dissolved and particulate materials from uplands across riparian zones and down the channels of river corridors? These papers cover work conducted in small watersheds on a wide range of topics within the spirit and geographical focus area of LBA: water balance and runoff generation, nutrient transformations in riparian zones and stream channels, carbon fluxes in water moving from land to water and the influence of soils on flowpath structure and stream chemistry. Important new insights can be gained from these and other studies. Forest clearing for pastures results in a decrease in soil hydraulic conductivity that forces water into surficial flowpaths throughout most of the rainy season across wide regions of the Amazon. Riparian zones along small forest streams appear to be very effective in removing nitrate arriving from the uplands, while forest streams take up nitrate at very low rates, allowing them to travel downstream for long distances. Although substantial, the contribution of dissolved organic C (DOC) to the carbon flux from forests to streams appears to be lower than the flux of dissolved inorganic C that is subsequently outgassed as CO2. Remaining key challenges within LBA will be to synthesize existing data sets on river networks, soils, climate, land use and planned infrastructure for the Amazon to develop models capable of predicting hydrologic and biogeochemical fluxes at a variety of scales relevant to the development of strategies for sustainable management of the Amazon's remarkable forest, soil and freshwater resources.},
language = {en}
}
@inproceedings{ZeheBronstertItzerottetal.2006,
author = {Zehe, Erwin and Bronstert, Axel and Itzerott, Sibylle and B{\´a}rdossy, Andr{\´a}s and Ihringer, J{\"u}rgen},
title = {Hochwasservorhersage, Großhangbewegungen, Schadstofftransport},
url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7128},
year = {2006},
abstract = {Interdisziplin{\"a}res Zentrum f{\"u}r Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006},
language = {de}
}
@phdthesis{Heller2006,
author = {Heller, Wilfried},
title = {Heller, W., The 'Bohemians' in New Zealand : an ethnik group?; Auckland, Univ., 2005},
year = {2006},
language = {en}
}
@phdthesis{Heller2006,
author = {Heller, Wilfried},
title = {Heller, W., The 'Bohemians' in New Zealand : an ethnik group?; Auckland, Univ., 2005},
year = {2006},
language = {en}
}
@article{Heller2006,
author = {Heller, Wilfried},
title = {Grenzen und Minderheiten : Einf{\"u}hrung},
year = {2006},
language = {de}
}
@inproceedings{MaerkerSchroederEsselbachCapolongoetal.2006,
author = {M{\"a}rker, Michael and Schr{\"o}der-Esselbach, Boris and Capolongo, Domenico and Bentivenga, Mario},
title = {Geomorphological and pedological processes in badland areas of Southern Italy and their interaction with Mediterranean vegetation},
url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-7288},
year = {2006},
abstract = {Interdisziplin{\"a}res Zentrum f{\"u}r Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006},
language = {en}
}
@phdthesis{Jacobs2006,
author = {Jacobs, J{\"o}rg},
title = {Entwicklung von Landschaftsszenarien f{\"u}r die Bewirtschaftung von Flusseinzugsgebieten nach den Anforderungen der EU-Wasserrahmenrichtlinie},
address = {Potsdam},
pages = {168 Bl. : graph. Darst.},
year = {2006},
language = {de}
}
@misc{HellerSaupeFelgentreffetal.2006,
author = {Heller, Wilfried and Saupe, Gabriele and Felgentreff, Carsten and Lindner, Waltraud},
title = {Entrepreneurial initiative and regional development: supporting policies in the land of Brandenburg (Eastern Germany)},
year = {2006},
language = {en}
}
@article{Jessel2006,
author = {Jessel, Beate},
title = {Elements, characteristics and character : information functions of landscapes in terms of indicators},
issn = {1470-160X},
doi = {10.1016/j.ecolind.2005.08.009},
year = {2006},
abstract = {When monitoring landscape changes, the visual landscape should also be considered. This pertains to the information function of ecosystems and landscapes that refers to environmental structure and its function for satisfying needs. These needs of human perception include a certain equipment of landscape with stimuli, spatial orientation, as well as aesthetical-emotional needs. However, previous approaches of environment monitoring and registration of landscape changes exclusively focus on the ecosystem; aesthetic and structural characteristics are evalu-ated, if at all, only via easily quantifiable variables in a data oriented manner that illustrates the diversity of individual landscape elements without theoretically grounding them based on general hypotheses and a theoretical concept. Based on results from perception research and information theory, therefore, a method for registering the visual landscape on different complexity levels was developed. This includes: Elements (i.e. "element level"), that is the description of the different types of land use and structure elements within a landscape unit. Furthermore, under these elements a variety of manifestations are also subsumed such as small spatial dimensional relations, as well as individual synesthetic perceptions (noise, smells);},
language = {en}
}
@book{Knappe2006,
author = {Knappe, Susanne},
title = {Die Regionalwirksamkeit der Wissenschaftseinrichtungen in Potsdam : eine empirische Analyse wissenschaftsbedingter Besch{\"a}ftigungs-, Einkommens- und Informationseffekte},
series = {Praxis Kultur- und Sozialgeographie},
volume = {40},
journal = {Praxis Kultur- und Sozialgeographie},
publisher = {Universit{\"a}tsverlag Potsdam},
address = {Potsdam},
isbn = {3-939469-51-3},
issn = {0934-716X},
pages = {110 S.},
year = {2006},
language = {de}
}
@book{OPUS4-11771,
title = {Die islamische Republik Iran : eine Studienreise},
series = {Praxis Kultur- und Sozialgeographie},
volume = {39},
journal = {Praxis Kultur- und Sozialgeographie},
editor = {Felgentreff, Carsten},
publisher = {Univ.-Verl. Potsdam},
address = {Potsdam},
isbn = {3-939469-25-4},
issn = {0934-716X},
pages = {78 S.},
year = {2006},
language = {de}
}
@article{Jessel2006,
author = {Jessel, Beate},
title = {Die Hintert{\"u}r seelischer Bed{\"u}rfnisse : Vertrautheit und Sehnsucht als Motive des Naturschutzes},
isbn = {3-86581-019-5},
year = {2006},
language = {de}
}
@article{BorkGeldmacherRoepkeetal.2006,
author = {Bork, Hans-Rudolf and Geldmacher, Karl and R{\"o}pke, Bj{\"o}rn and Schaphoff, Sibyll and Schnur, Tilo and Berdel, Franka and Bork, Helga and Dalchow, Claus and Faust, Berno},
title = {Die goldene Gans wird zu Tode gerupft : Bodenzerst{\"o}rung in der L{\"o}sslandschaft des Palouse (Washington und Idaho, USA)},
isbn = {978-3-89678-584-8},
year = {2006},
language = {de}
}
@article{BorkGeldmacherSchaphoffetal.2006,
author = {Bork, Hans-Rudolf and Geldmacher, Karl and Schaphoff, Sibyll and Dalchow, Claus and Faust, Berno},
title = {Der halbierte Brunnen am East Fork Cottonwood Creek in Oregon (USA)},
isbn = {3-89678-584-2},
year = {2006},
language = {de}
}
@article{Heller2006,
author = {Heller, Wilfried},
title = {Demographie, Migration und r{\"a}umliche Entwicklung in Rum{\"a}nien : Rum{\"a}nien, quo vadis?},
year = {2006},
language = {de}
}
@article{Heller2006,
author = {Heller, Wilfried},
title = {Demographie, Migration und r{\"a}umliche Entwicklung},
year = {2006},
language = {de}
}
@article{BolduanZehe2006,
author = {Bolduan, Rainer and Zehe, Erwin},
title = {Degradation of isoproturon in earthworm macropores and subsoil matrix : a field study},
issn = {1436-8730},
doi = {10.1002/jpin.200521754},
year = {2006},
abstract = {The objective is to compare the time scale of microbial degradation of the herbicide Isoproturon at the end of earthworm burrows with the time scale of microbial degradation in the surrounding soil matrix. To this end, we developed a method which allows the observation of microbial degradation on Isoproturon in macropores under field conditions. Study area was the well-investigated Weiherbach catchment (Kraichgau, SW Germany). The topsoil of a 12 m(2) large plot parcel was removed, the parcel was covered with a tent and instrumented with TDR and temperature sensors at two depths. After preliminary investigations to optimize application and sampling techniques, the bottom of 55 earthworm burrows, located at a depth of 80-100cm, was inoculated with Isoproturon. Within an interval of 8 d, soil material from the bottom of 5-6 earthworm burrows was taken into the laboratory and analyzed for the Isoproturon concentration for investigation of the degradation kinetics. Furthermore, the degradation of Isoproturon in the soil matrix, that surrounded the macropores at the field plot, was observed in the laboratory. Microbial degradation of Isoproturon at the bottom of the earthworm burrows was with a DT-50-value of 15.6 d almost as fast as in the topsoil. In the soil matrix that closely surrounded the center of the earthworm burrows, no measurable degradation was observed within 30 d. The clearly slower degradation in the soil matrix may be likely explained by a lower microbial activity that was observed in the surrounding soil matrix. The results give evidence that deterministic modeling of the fate of pesticides once transported into heterogeneous subsoils by preferential flow requires an accuracy of a few centimeters in terms of predicting spatial locations: time scales of microbial degradation in the subsoil drop almost one order of magnitude, in case the herbicides dislocates from the bottom of an earthworm burrow a few centimeter into the surrounding soil matrix. If at all, predictions of such an accuracy can only be achieved at locations at sites where the soil hydraulic properties and the macropore system are known at a very high spatial resolution},
language = {en}
}
@phdthesis{Stauch2006,
author = {Stauch, Vanessa Juliane},
title = {Data-led methods for the analysis and interpretation of eddy covariance observations},
url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-12389},
school = {Universit{\"a}t Potsdam},
year = {2006},
abstract = {The terrestrial biosphere impacts considerably on the global carbon cycle. In particular, ecosystems contribute to set off anthropogenic induced fossil fuel emissions and hence decelerate the rise of the atmospheric CO₂ concentration. However, the future net sink strength of an ecosystem will heavily depend on the response of the individual processes to a changing climate. Understanding the makeup of these processes and their interaction with the environment is, therefore, of major importance to develop long-term climate mitigation strategies. Mathematical models are used to predict the fate of carbon in the soil-plant-atmosphere system under changing environmental conditions. However, the underlying processes giving rise to the net carbon balance of an ecosystem are complex and not entirely understood at the canopy level. Therefore, carbon exchange models are characterised by considerable uncertainty rendering the model-based prediction into the future prone to error. Observations of the carbon exchange at the canopy scale can help learning about the dominant processes and hence contribute to reduce the uncertainty associated with model-based predictions. For this reason, a global network of measurement sites has been established that provides long-term observations of the CO₂ exchange between a canopy and the atmosphere along with micrometeorological conditions. These time series, however, suffer from observation uncertainty that, if not characterised, limits their use in ecosystem studies. The general objective of this work is to develop a modelling methodology that synthesises physical process understanding with the information content in canopy scale data as an attempt to overcome the limitations in both carbon exchange models and observations. Similar hybrid modelling approaches have been successfully applied for signal extraction out of noisy time series in environmental engineering. Here, simple process descriptions are used to identify relationships between the carbon exchange and environmental drivers from noisy data. The functional form of these relationships are not prescribed a priori but rather determined directly from the data, ensuring the model complexity to be commensurate with the observations. Therefore, this data-led analysis results in the identification of the processes dominating carbon exchange at the ecosystem scale as reflected in the data. The description of these processes may then lead to robust carbon exchange models that contribute to a faithful prediction of the ecosystem carbon balance. This work presents a number of studies that make use of the developed data-led modelling approach for the analysis and interpretation of net canopy CO₂ flux observations. Given the limited knowledge about the underlying real system, the evaluation of the derived models with synthetic canopy exchange data is introduced as a standard procedure prior to any real data employment. The derived data-led models prove successful in several different applications. First, the data-based nature of the presented methods makes them particularly useful for replacing missing data in the observed time series. The resulting interpolated CO₂ flux observation series can then be analysed with dynamic modelling techniques, or integrated to coarser temporal resolution series for further use e.g., in model evaluation exercises. However, the noise component in these observations interferes with deterministic flux integration in particular when long time periods are considered. Therefore, a method to characterise the uncertainties in the flux observations that uses a semi-parametric stochastic model is introduced in a second study. As a result, an (uncertain) estimate of the annual net carbon exchange of the observed ecosystem can be inferred directly from a statistically consistent integration of the noisy data. For the forest measurement sites analysed, the relative uncertainty for the annual sum did not exceed 11 percent highlighting the value of the data. Based on the same models, a disaggregation of the net CO₂ flux into carbon assimilation and respiration is presented in a third study that allows for the estimation of annual ecosystem carbon uptake and release. These two components can then be further analysed for their separate response to environmental conditions. Finally, a fourth study demonstrates how the results from data-led analyses can be turned into a simple parametric model that is able to predict the carbon exchange of forest ecosystems. Given the global network of measurements available the derived model can now be tested for generality and transferability to other biomes. In summary, this work particularly highlights the potential of the presented data-led methodologies to identify and describe dominant carbon exchange processes at the canopy level contributing to a better understanding of ecosystem functioning.},
language = {en}
}
@phdthesis{Mueller2006,
author = {M{\"u}ller, Christoph},
title = {Climate change and global land-use patterns : quantifying the human impact on the terrestrial biosphere},
address = {Potsdam},
pages = {XII, 104, XXII S. : graph. Darst.},
year = {2006},
language = {en}
}
@book{OPUS4-954,
title = {Bewirtschaftungsm{\"o}glichkeiten im Einzugsgebiet der Havel},
number = {18},
editor = {Bronstert, Axel and Itzerott, Sibylle},
publisher = {Universit{\"a}tsverlag Potsdam},
address = {Potsdam},
isbn = {978-3-939469-17-9},
issn = {1434-2375},
url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-8177},
publisher = {Universit{\"a}t Potsdam},
pages = {211},
year = {2006},
abstract = {Das Verbundprojekt "Bewirtschaftungsm{\"o}glichkeiten im Einzugsgebiet der Havel" hat Methoden und Werkzeuge entwickelt, welche zur Bewertung alternativer Bewirtschaftungsm{\"o}glichkeiten im Einzugsgebiet der Havel mit dem Ziel der Verbesserung der Gew{\"a}sserg{\"u}te dienen. Neben den naturr{\"a}umlichen Gegebenheiten dieses typischen, langsam fließenden Tieflandflusses mit eingelagerten Flachseen, weit gespannten Auen und der direkten Kopplung von Grund- und Oberfl{\"a}chenwasser galt das Interesse einer Reihe von Nutzungsanspr{\"u}chen mit ihren Auswirkungen auf den Wasser- und Stoffhaushalt. Im Mittelpunkt stehen hierbei die Stoffeintr{\"a}ge aus Landwirtschafts- und Siedlungsfl{\"a}chen sowie Aspekte der wasserwirtschaftlichen Steuerung. Es werden die Auswirkungen verschiedener Bewirtschaftungsoptionen der Gew{\"a}sser und ihrer Einzugsgebiete auf die Wassermenge und -qualit{\"a}t untersucht. Damit werden die wissenschaftlichen Grundlagen f{\"u}r die Bewertung des Zustandes der Gew{\"a}sser sowie k{\"u}nftiger Handlungsoptionen und Entwicklungsszenarios nach der EG-Wasserrahmenrichtlinie (EG-WRRL) geschaffen. Neben den methodischen Aufgaben zur Erstellung, Anpassung und Kopplung von Modellwerkzeugen (Systemmodelle, Szenarientechniken) werden naturraumspezifische und sozio{\"o}konomische Bewertungsmaßst{\"a}be, umsetzungsorientierte Handlungsoptionen sowie Werkzeuge f{\"u}r die Verwertung der Ergebnisse durch die Fachverwaltung erarbeitet.},
language = {de}
}
@book{BlumensteinVanRensburgKruegeretal.2006,
author = {Blumenstein, Oswald and Van Rensburg, L. and Kr{\"u}ger, Wolfgang and Schachtzabel, Hartmut},
title = {Basics for modelling of heavy metal dynamics in tailing dam systems},
series = {Stoffdynamik in Geosystemen},
volume = {11},
journal = {Stoffdynamik in Geosystemen},
publisher = {Selbstverl. der Arbeitsgruppe Stoffdynamik in Geosystemen},
address = {Potsdam},
issn = {0949-4731},
pages = {109 S.},
year = {2006},
language = {en}
}
@article{SchroederSeppelt2006,
author = {Schr{\"o}der, Boris and Seppelt, Ralf},
title = {Analysis of pattern-process interactions based on landscape models - Overview, general concepts, and methodological issues},
series = {Ecological modelling : international journal on ecological modelling and engineering and systems ecolog},
volume = {199},
journal = {Ecological modelling : international journal on ecological modelling and engineering and systems ecolog},
number = {4},
publisher = {Elsevier},
address = {Amsterdam},
issn = {0304-3800},
doi = {10.1016/j.ecolmodel.2006.05.036},
pages = {505 -- 516},
year = {2006},
abstract = {Pattern-process analysis is one of the main threads in landscape ecological research. It aims at understanding the complex relationships between ecological processes and landscape patterns, identifying the underlying mechanisms and deriving valid predictions for scenarios of landscape change and its consequences. Today, various studies cope with these tasks through so called "landscape modelling" approaches. They integrate different aspects of heterogeneous and dynamic landscapes and model different driving forces, often using both statistical and process-oriented techniques. We identify two main approaches to deal with the analysis of pattern-process interactions: the first starts with pattern detection, pattern description and pattern analysis, the second with process description, simulation and pattern generation. Focussing on the interplay between these two approaches, landscape analysis and landscape modelling will improve our understanding of pattern-process interactions. The comparison of simulated and observed pattern is a prerequisite for both approaches. Therefore, we identify a set of quantitative, robust, and reproducible methods for the analysis of spatiotemporal patterns that is a starting point for a standard toolbox for ecologists as major future challenge and suggest necessary further methodological developments. (c) 2006 Elsevier B.V. All rights reserved.},
language = {en}
}