TY - JOUR
A1 - Flögel, W.-A,
A1 - Märker, Michael
A1 - Moretti, S.
A1 - Rodolfi, G.
T1 - Integrating GIS, Remote Sensing, Ground Trouthing and Modelling Approaches for Regional Erosion Classification of semiarid catchments in South Africa and Swaziland
Y1 - 2003
ER -
TY - JOUR
A1 - Sidorchuk, A.
A1 - Märker, Michael
A1 - Moretti, S.
A1 - Rodolfi, G.
T1 - Gully erosion modelling and landscape response in the Mbuluzi River catchment of Swaziland
Y1 - 2003
SN - 0341-8162
ER -
TY - JOUR
A1 - Ochschild, V.
A1 - Staudenbrausch, H.
A1 - Märker, Michael
T1 - Detection of different land degradation stages in semi-arid grassland areas in Souhtern Africa
Y1 - 2003
ER -
TY - JOUR
A1 - Märker, Michael
A1 - Sidorchuk, A.
T1 - Assessment of gully erosion process dynamics for water resources management in a semiarid catchment of Swaziland, Southern Africa
Y1 - 2003
SN - 1-901502-22-8
ER -
TY - CHAP
A1 - Kühling, Matthias
A1 - Märker, Michael
A1 - Zehe, Erwin
ED - Gzik, Axel
ED - Hochschild, Volker
ED - Schneider, Ingo
ED - Schröder, Boris
T1 - Musterdynamik und Fernerkundung in der Döberitzer Heide : [Poster]
N2 - Mit der politischen Wende in den Staaten des ehemaligen Ostblockes wurde für viele militärisch genutzte Flächen ein tiefgreifender Nutzungswandel eingeleitet. Truppenübungsplätze als stark gestörte Bestandteile unserer Kulturlandschaft weisen auf großen Flächen naturschutzfachlich wertvolle Habitatmosaike mit speziellen Lebensgemeinschaften auf. Der Nutzungswandel ist mit einer Veränderung der Vegetationsstrukturen (Sukzession) und weiteren landschaftsökologischen Prozessen verbunden. Der ehemalige Truppenübungsplatz Döberitz im Norden der Landeshauptstadt Potsdam kann auf eine lange militärische Nutzungsgeschichte verweisen (erste Manöver des Soldatenkönigs im Jahr 1713). Nach 1992 wurden das NSG Döberitzer Heide (3.415 ha) und das NSG Ferbitzer Bruch (1.155 ha) ausgewiesen. Als Schutzgebiete nach der Vogelschutzrichtlinie sind sie Bestandteile des kohärenten Schutzgebietssystems Natura 2000 der europäischen Gemeinschaft. Trotz des Schutzstatus und der militärischen Altlasten unterliegt das Gebiet als größte zusammenhängende Naturfläche im engeren Verflechtungsraum des Landes Brandenburg einem hohen Nutzungsdruck.
Interdisziplinäres Zentrum für Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-7277
ER -
TY - CHAP
A1 - Märker, Michael
A1 - Schröder-Esselbach, Boris
A1 - Capolongo, Domenico
A1 - Bentivenga, Mario
T1 - Geomorphological and pedological processes in badland areas of Southern Italy and their interaction with Mediterranean vegetation
N2 - Interdisziplinäres Zentrum für Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-7288
N1 - [Poster]
ER -
TY - JOUR
A1 - Bridgwater, D.
A1 - Scott, D. J.
A1 - Balagansky, V. V.
A1 - Timmerman, Martin Jan
A1 - Marker, Michael
A1 - Bushmin, S. S.
A1 - Alexeyev, N. L.
A1 - Daly, J. S.
T1 - Age and provenance of early Precambrian metasedimentary rocks in the Lapland-Kola Belt, Russia : evidence from Pb and Nd isotopic data
Y1 - 2001
ER -
TY - JOUR
A1 - Vorpahl, Peter
A1 - Dislich, Claudia
A1 - Elsenbeer, Helmut
A1 - Märker, Michael
A1 - Schröder-Esselbach, Boris
T1 - Biotic controls on shallow translational landslides
JF - Earth surface processes and landforms : the journal of the British Geomorphological Research Group
N2 - In undisturbed tropical montane rainforests massive organic layers accommodate the majority of roots and only a small fraction of roots penetrate the mineral soil. We investigated the contribution of vegetation to slope stability in such environments by modifying a standard model for slope stability to include an organic layer with distinct mechanical properties. The importance of individual model parameters was evaluated using detailed measurements of soil and vegetation properties to reproduce the observed depth of 11 shallow landslides in the Andes of southern Ecuador. By distinguishing mineral soil, organic layer and above-ground biomass, it is shown that in this environment vegetation provides a destabilizing effect mainly due to its contribution to the mass of the organic layer (up to 973 t ha-1 under wet conditions). Sensitivity analysis shows that the destabilizing effect of the mass of soil and vegetation can only be effective on slopes steeper than 37.9 degrees. This situation applies to 36% of the study area. Thus, on the steep slopes of this megadiverse ecosystem, the mass of the growing forest promotes landsliding, which in turn promotes a new cycle of succession. This feedback mechanism is worth consideration in further investigations of the impact of landslides on plant diversity in similar environments.
KW - shallow translational landslides
KW - tropical montane forest
KW - biomass
KW - organic layer
Y1 - 2013
U6 - https://doi.org/10.1002/esp.3320
SN - 0197-9337
VL - 38
IS - 2
SP - 198
EP - 212
PB - Wiley-Blackwell
CY - Hoboken
ER -
TY - JOUR
A1 - Vorpahl, Peter
A1 - Elsenbeer, Helmut
A1 - Märker, Michael
A1 - Schröder-Esselbach, Boris
T1 - How can statistical models help to determine driving factors of landslides?
JF - Ecological modelling : international journal on ecological modelling and engineering and systems ecolog
N2 - Landslides are a hazard for humans and artificial structures. From an ecological point of view, they represent an important ecosystem disturbance, especially in tropical montane forests. Here, shallow translational landslides are a frequent natural phenomenon and one local determinant of high levels of biodiversity. In this paper, we apply weighted ensembles of advanced phenomenological models from statistics and machine learning to analyze the driving factors of natural landslides in a tropical montane forest in South Ecuador. We exclusively interpret terrain attributes, derived from a digital elevation model, as proxies to several driving factors of landslides and use them as predictors in our models which are trained on a set of five historical landslide inventories. We check the model generality by transferring them in time and use three common performance criteria (i.e. AUC, explained deviance and slope of model calibration curve) to, on the one hand, compare several state-of-the-art model approaches and on the other hand, to create weighted model ensembles. Our results suggest that it is important to consider more than one single performance criterion.
Approaching our main question, we compare responses of weighted model ensembles that were trained on distinct functional units of landslides (i.e. initiation, transport and deposition zones). This way, we are able to show that it is quite possible to deduce driving factors of landslides, if the consistency between the training data and the processes is maintained. Opening the 'black box' of statistical models by interpreting univariate model response curves and relative importance of single predictors regarding their plausibility, we provide a means to verify this consistency.
With the exception of classification tree analysis, all techniques performed comparably well in our case study while being outperformed by weighted model ensembles. Univariate response curves of models trained on distinct functional units of landslides exposed different shapes following our expectations. Our results indicate the occurrence of landslides to be mainly controlled by factors related to the general position along a slope (i.e. ridge, open slope or valley) while landslide initiation seems to be favored by small scale convexities on otherwise plain open slopes.
KW - Landslides
KW - Tropical montane forests
KW - Statistical modeling
KW - Model comparison
KW - Artificial neuronal network
KW - Classification trees
KW - Random forests
KW - Boosted regression trees
KW - Generalized linear models
KW - Multivariate adaptive regression splines
KW - Maximum entropy method
KW - Weighted model ensembles
Y1 - 2012
U6 - https://doi.org/10.1016/j.ecolmodel.2011.12.007
SN - 0304-3800
SN - 1872-7026
VL - 239
IS - 7
SP - 27
EP - 39
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Grimm, Rosina
A1 - Behrens, T.
A1 - Märker, Michael
A1 - Elsenbeer, Helmut
T1 - Soil organic carbon concentrations and stocks on Barro Colorado Island : digital soil mapping using random forests analysis
Y1 - 2008
UR - http://si-pddr.si.edu/jspui/bitstream/10088/8584/1/ Grimm_et_al_Soil_organic_carbon_concentrations_and_stocks_on_B.pdf
U6 - https://doi.org/10.1016/j.geoderma.2008.05.008
SN - 0016-7061
ER -