TY - JOUR A1 - Sturzbecher, Dietmar A1 - Dietrich, Peter T1 - Risiko- und Schutzfaktoren in der Entwicklung von Kindern und Jugendlichen Y1 - 2007 ER - TY - JOUR A1 - Them, W. A1 - Kopp, Andrea A1 - Großmann, Heidrun A1 - Dietrich, Peter A1 - Sturzbecher, Dietmar T1 - Erfassung und Optimierung von Strukturen der Ausbildungs- und Beschäftigungsförderung für Unterstellte der Bewährungshilfe : ein Praxisprojekt Y1 - 2006 SN - 3-926371-71-4 ER - TY - JOUR A1 - Dietrich, Peter A1 - Sturzbecher, Dietmar T1 - Scheidungskinder und Soldatenväter vor dem Hintergrund von Auslandseinsätzen der Bundeswehr : ein Fallbeispiel Y1 - 2005 SN - 3-631-53357-8 ER - TY - THES A1 - Dietrich, Peter T1 - Organisationaler Wandel öffentlicher Wohnungsunternehmen : eine fallstudie, betrachtet aus ökonomischer und soziologischer Perspektive Y1 - 2003 SN - 3-87292-167-3 PB - Hammonia CY - Hamburg ER - TY - JOUR A1 - Zech, Alraune A1 - Attinger, Sabine A1 - Bellin, Alberto A1 - Cvetkovic, Vladimir A1 - Dietrich, Peter A1 - Fiori, Aldo A1 - Teutsch, Georg A1 - Dagan, Gedeon T1 - A Critical Analysis of Transverse Dispersivity Field Data JF - Groundwater : journal of the Association of Ground-Water Scientists and Engineers, a division of the National Ground Water Association N2 - Transverse dispersion, or tracer spreading orthogonal to the mean flow direction, which is relevant e.g, for quantifying bio-degradation of contaminant plumes or mixing of reactive solutes, has been studied in the literature less than the longitudinal one. Inferring transverse dispersion coefficients from field experiments is a difficult and error-prone task, requiring a spatial resolution of solute plumes which is not easily achievable in applications. In absence of field data, it is a questionable common practice to set transverse dispersivities as a fraction of the longitudinal one, with the ratio 1/10 being the most prevalent. We collected estimates of field-scale transverse dispersivities from existing publications and explored possible scale relationships as guidance criteria for applications. Our investigation showed that a large number of estimates available in the literature are of low reliability and should be discarded from further analysis. The remaining reliable estimates are formation-specific, span three orders of magnitude and do not show any clear scale-dependence on the plume traveled distance. The ratios with the longitudinal dispersivity are also site specific and vary widely. The reliability of transverse dispersivities depends significantly on the type of field experiment and method of data analysis. In applications where transverse dispersion plays a significant role, inference of transverse dispersivities should be part of site characterization with the transverse dispersivity estimated as an independent parameter rather than related heuristically to longitudinal dispersivity. Y1 - 2018 U6 - https://doi.org/10.1111/gwat.12838 SN - 0017-467X SN - 1745-6584 VL - 57 IS - 4 SP - 632 EP - 639 PB - Wiley CY - Hoboken ER - TY - BOOK A1 - Sturzbecher, Dietmar A1 - Dietrich, Peter T1 - Die Situation von Jugendlichen in Brandenburg : zusammenfassende Darstellung zu den Feldstudien "Jugendszene und Jugendgewalt im Land Brandenburg " und "Freizeitverhalten Jugendlicher und Freizeitangebote..." T3 - Schriftenreihe zur politischen Bildung Y1 - 1992 VL - 4 PB - Brandenburgische Landeszentrale für Politische Bildung CY - Potsdam ER - TY - BOOK A1 - Sturzbecher, Dietmar A1 - Dietrich, Peter ED - Sturzbecher, Dietmar ED - Dietrich, Peter T1 - Die Situation von Jugendlichen in Brandenburg Y1 - 1992 PB - Eisermann CY - Werder (Havel) ER - TY - BOOK A1 - Dietrich, Peter A1 - Sturzbecher, Dietmar A1 - Mudersbach, Antje ED - Oswald, H. ED - Sturzbecher, Dietmar T1 - Trennung und Scheidung : eine Analyse des Beratungsangebots in den neuen Bundesländern T3 - Potsdamer Berichte zur Bildungs- und Sozialisationsforschung Y1 - 1998 SN - 3-931147-69-X VL - 2 PB - Verl. Empirische Pädagogik CY - Landau ER - TY - JOUR A1 - Sturzbecher, Dietmar A1 - Dietrich, Peter T1 - In die Freiheit entlassen Y1 - 1993 SN - 3-87134-113-4 ER - TY - JOUR A1 - Dietrich, Peter A1 - Kohlstruck, Michael A1 - Sturzbecher, Dietmar T1 - Jugendliche Mentalitäten in Brandenburg Y1 - 1993 ER - TY - JOUR A1 - Sturzbecher, Dietmar A1 - Dietrich, Peter T1 - Jugendgewalt und Fremdenfeindlichkeit : eine Herausforderung an Schule und politische Bildung Y1 - 1993 ER - TY - BOOK A1 - Sturzbecher, Dietmar A1 - Dietrich, Peter T1 - Gewaltbereitschaft, Fremdenfeindlichkeit und Politikverdrossenheit Y1 - 1993 ER - TY - JOUR A1 - Dietrich, Peter A1 - Tronicke, Jens T1 - Integrated analysis and interpretation of cross-hole P- and S-wave tomograms : a case study N2 - We present cross-hole P- and S-wave seismic experiments that have been performed along a similar to 100 m long transect for the detailed characterization of a contaminated sedimentary site (Bitterfeld research test site, Germany). We invert the corresponding first break arrival times for the P- and S-wave velocity structure and compare two different strategies to interpret these models in terms of pertinent lithological and geotechnical parameter variations. The first (common) approach is based on directly translating the tomographic velocity models into the parameters of interest (e.g., elastic moduli). The second (zonal) approach first reduces the tomographic parameter information to a limited number of characteristic velocity combinations via k-means cluster analysis. Then, for each zone (cluster) further parameters including uncertainties can be estimated. In the presented case study, Our results indicate that the zonal approach provides an effective means for the integrated interpretation of different co-located data. Y1 - 2009 UR - http://nsg.eage.org/ U6 - https://doi.org/10.3997/1873-0604.2008041 SN - 1569-4445 ER - TY - JOUR A1 - Sturzbecher, Dietmar A1 - Hermann, Ute A1 - Dietrich, Peter T1 - Neuere Ergebnisse zum FIT-KIT Y1 - 2004 ER - TY - BOOK A1 - Dietrich, Peter A1 - Sturzbecher, Dietmar A1 - Mudersbach, A. T1 - Beratung bei Trennung und Scheidung in den neuen Bundesländern T3 - Forschungsbericht Y1 - 1997 VL - 11 PB - Eigenverl. CY - Vehlefanz ER - TY - BOOK A1 - Sturzbecher, Dietmar A1 - Dietrich, Peter A1 - Kohlstruck, Michael T1 - Jugend in Brandenburg 93 T3 - Forschungsbericht Y1 - 1994 VL - 4 PB - Eigenverl. CY - Vehlefanz ER - TY - JOUR A1 - Sturzbecher, Dietmar A1 - Dietrich, Peter T1 - Zu den Ursachen schulverweigerischen Verhaltens bei 12- bis 18jährigen Schülern Y1 - 1994 ER - TY - BOOK A1 - Sturzbecher, Dietmar A1 - Dietrich, Peter T1 - Schulverweigerung von Jugendlichen im Land Brandenburg T3 - Forschungsbericht Y1 - 1993 VL - 3 PB - Eigenverl. CY - Vehlefanz ER - TY - JOUR A1 - Sturzbecher, Dietmar A1 - Dietrich, Peter T1 - Jugendliche in Brandenburg : Signale einer unverstandenen Generation Y1 - 1993 ER - TY - BOOK A1 - Sturzbecher, Dietmar A1 - Dietrich, Peter T1 - Die Situation von Jugendlichen in Brandenburg T3 - Forschungsbericht Y1 - 1992 VL - 2 PB - Eigenverl. CY - Vehlefanz ER - TY - JOUR A1 - Paasche, Hendrik A1 - Werban, Ulrike A1 - Dietrich, Peter T1 - Near-surface seismic traveltime tomography using a direct-push source and surface-planted geophones N2 - Information about seismic velocity distribution in heterogeneous near-surface sedimentary deposits is essential for a variety of environmental and engineering geophysical applications. We have evaluated the suitability of the minimally invasive direct-push technology for near-surface seismic traveltime tomography. Geophones placed at the surface and a seismic source installed temporarily in the subsurface by direct-push technology quickly acquire reversed multioffset vertical seismic profiles (VSPs). The first-arrival traveltimes of these data were used to reconstruct the 2D seismic velocity distribution tomographically. After testing this approach on synthetic data, we applied it to field data collected over alluvial deposits in a former river floodplain. The resulting velocity model contains information about high- and low-velocity anomalies and offers a significantly deeper penetration depth than conventional refraction tomography using surface-planted sources and receivers at the investigated site. A combination of refraction seismic and direct-push data increases resolution capabilities in the unsaturated zone and enables reliable reconstruction of velocity variations in near-surface unconsolidated sediments. The final velocity model structurally matches the results of cone-penetration tests and natural gamma-radiation data acquired along the profile. The suitability of multiple rapidly acquired reverse VSP surveys for 2D tomographic velocity imaging of near-surface unconsolidated sediments was explored. Y1 - 2009 UR - http://scitation.aip.org/geophysics/ U6 - https://doi.org/10.1190/1.3131612 SN - 0016-8033 ER - TY - JOUR A1 - Sauer, David A1 - Popp, Steffen A1 - Dittfurth, Angela A1 - Altdorff, Daniel A1 - Dietrich, Peter A1 - Paasche, Hendrik T1 - Soil moisture assessment over an alpine hillslope with significant soil heterogeneity JF - Vadose zone journal N2 - We strive to assess soil water content on a well-studied slow-moving hillslope in Austria. In doing so, we employ time lapse mapping of bulk electrical conductivity using a geophysical electromagnetic induction system operated at low induction numbers. This information is complemented by the acquisition of soil samples for gravimetric water content analysis during one survey campaign. Simple visual soil sample analysis reveals that the upper material in the survey area is a spatially highly variable mixture of predominately sandy, silty, clayey and organic materials. Due to this heterogeneity, classical approaches of mapping soil moisture on the basis of stationary mapping of electrical conductivity variations are not successful. Also the time-lapse approach does not allow ruling out some of the ambiguity inherent to the linkage of bulk electrical conductivity to soil water content. However, indication is found that time-lapse measurements may have supportive capabilities to identify regions of low precipitation infiltration due to high soil saturation. Furthermore, the relationship between the mean electrical conductivity averaged over a full vegetation period and an already available ecological moisture map produced by vegetation analysis is found to resemble closely the relationship observed between gravimetric soil water content and electrical conductivity during the time of sample collection except for highly organic soils. This leads us to the assumption that the relative soil moisture distribution is temporarily stable except for those areas characterized by highly organic soils. Y1 - 2013 U6 - https://doi.org/10.2136/vzj2013.01.0009 SN - 1539-1663 VL - 12 IS - 4 PB - Soil Science Society of America CY - Madison ER - TY - JOUR A1 - Dietrich, Peter T1 - Zu den Erscheinungsformen und Ursachen von schulverweigerischem Verhalten - Ausgewählte Ergebnisse einer Brandenburger Studie Y1 - 1996 ER - TY - JOUR A1 - Paasche, Hendrik A1 - Tronicke, Jens A1 - Dietrich, Peter T1 - Zonal cooperative inversion of partially co-located data sets constrained by structural a priori information JF - Near surface geophysics N2 - In many near-surface geophysical studies it is now common practice to collect co-located disparate geophysical data sets to explore subsurface structures. Reconstruction of physical parameter distributions underlying the available geophysical data sets usually requires the use of tomographic reconstruction techniques. To improve the quality of the obtained models, the information content of all data sets should be considered during the model generation process, e.g., by employing joint or cooperative inversion approaches. Here, we extend the zonal cooperative inversion methodology based on fuzzy c-means cluster analysis and conventional single-input data set inversion algorithms for the cooperative inversion of data sets with partially co-located model areas. This is done by considering recent developments in fuzzy c-means cluster analysis. Additionally, we show how supplementary a priori information can be incorporated in an automated fashion into the zonal cooperative inversion approach to further constrain the inversion. The only requirement is that this a priori information can be expressed numerically; e.g., by physical parameters or indicator variables. We demonstrate the applicability of the modified zonal cooperative inversion approach using synthetic and field data examples. In these examples, we cooperatively invert S- and P-wave traveltime data sets with partially co-located model areas using water saturation information expressed by indicator variables as additional a priori information. The approach results in a zoned multi-parameter model, which is consistent with all available information given to the zonal cooperative inversion and outlines the major subsurface units. In our field example, we further compare the obtained zonal model to sparsely available borehole and direct-push logs. This comparison provides further confidence in our zonal cooperative inversion model because the borehole and direct-push logs indicate a similar zonation. Y1 - 2012 U6 - https://doi.org/10.3997/1873-0604.2011033 SN - 1569-4445 VL - 10 IS - 2 SP - 103 EP - 116 PB - European Association of Geoscientists & Engineers CY - Houten ER - TY - JOUR A1 - Schrön, Martin A1 - Zacharias, Steffen A1 - Womack, Gary A1 - Köhli, Markus A1 - Desilets, Darin A1 - Oswald, Sascha Eric A1 - Bumberger, Jan A1 - Mollenhauer, Hannes A1 - Kögler, Simon A1 - Remmler, Paul A1 - Kasner, Mandy A1 - Denk, Astrid A1 - Dietrich, Peter T1 - Intercomparison of cosmic-ray neutron sensors and water balance monitoring in an urban environment JF - Geoscientific instrumentation, methods and data systems N2 - Sensor-to-sensor variability is a source of error common to all geoscientific instruments that needs to be assessed before comparative and applied research can be performed with multiple sensors. Consistency among sensor systems is especially critical when subtle features of the surrounding terrain are to be identified. Cosmic-ray neutron sensors (CRNSs) are a recent technology used to monitor hectometre-scale environmental water storages, for which a rigorous comparison study of numerous co-located sensors has not yet been performed. In this work, nine stationary CRNS probes of type "CRS1000" were installed in relative proximity on a grass patch surrounded by trees, buildings, and sealed areas. While the dynamics of the neutron count rates were found to be similar, offsets of a few percent from the absolute average neutron count rates were found. Technical adjustments of the individual detection parameters brought all instruments into good agreement. Furthermore, we found a critical integration time of 6 h above which all sensors showed consistent dynamics in the data and their RMSE fell below 1% of gravimetric water content. The residual differences between the nine signals indicated local effects of the complex urban terrain on the scale of several metres. Mobile CRNS measurements and spatial simulations with the URANOS neutron transport code in the surrounding area (25 ha) have revealed substantial sub-footprint heterogeneity to which CRNS detectors are sensitive despite their large averaging volume. The sealed and constantly dry structures in the footprint furthermore damped the dynamics of the CRNS-derived soil moisture. We developed strategies to correct for the sealed-area effect based on theoretical insights about the spatial sensitivity of the sensor. This procedure not only led to reliable soil moisture estimation during dry-out periods, it further revealed a strong signal of intercepted water that emerged over the sealed surfaces during rain events. The presented arrangement offered a unique opportunity to demonstrate the CRNS performance in complex terrain, and the results indicated great potential for further applications in urban climate research. Y1 - 2018 U6 - https://doi.org/10.5194/gi-7-83-2018 SN - 2193-0856 SN - 2193-0864 VL - 7 IS - 1 SP - 83 EP - 99 PB - Copernicus CY - Göttingen ER - TY - JOUR A1 - Schroen, Martin A1 - Koehli, Markus A1 - Scheiffele, Lena A1 - Iwema, Joost A1 - Bogena, Heye R. A1 - Lv, Ling A1 - Martini, Edoardo A1 - Baroni, Gabriele A1 - Rosolem, Rafael A1 - Weimar, Jannis A1 - Mai, Juliane A1 - Cuntz, Matthias A1 - Rebmann, Corinna A1 - Oswald, Sascha Eric A1 - Dietrich, Peter A1 - Schmidt, Ulrich A1 - Zacharias, Steffen T1 - Improving calibration and validation of cosmic-ray neutron sensors in the light of spatial sensitivity JF - Hydrology and earth system sciences : HESS N2 - In the last few years the method of cosmic-ray neutron sensing (CRNS) has gained popularity among hydrologists, physicists, and land-surface modelers. The sensor provides continuous soil moisture data, averaged over several hectares and tens of decimeters in depth. However, the signal still may contain unidentified features of hydrological processes, and many calibration datasets are often required in order to find reliable relations between neutron intensity and water dynamics. Recent insights into environmental neutrons accurately described the spatial sensitivity of the sensor and thus allowed one to quantify the contribution of individual sample locations to the CRNS signal. Consequently, data points of calibration and validation datasets are suggested to be averaged using a more physically based weighting approach. In this work, a revised sensitivity function is used to calculate weighted averages of point data. The function is different from the simple exponential convention by the extraordinary sensitivity to the first few meters around the probe, and by dependencies on air pressure, air humidity, soil moisture, and vegetation. The approach is extensively tested at six distinct monitoring sites: two sites with multiple calibration datasets and four sites with continuous time series datasets. In all cases, the revised averaging method improved the performance of the CRNS products. The revised approach further helped to reveal hidden hydrological processes which otherwise remained unexplained in the data or were lost in the process of overcalibration. The presented weighting approach increases the overall accuracy of CRNS products and will have an impact on all their applications in agriculture, hydrology, and modeling. Y1 - 2017 U6 - https://doi.org/10.5194/hess-21-5009-2017 SN - 1027-5606 SN - 1607-7938 VL - 21 SP - 5009 EP - 5030 PB - Copernicus CY - Göttingen ER - TY - JOUR A1 - Zehe, E. A1 - Ehret, U. A1 - Pfister, L. A1 - Blume, Theresa A1 - Schroeder, Boris A1 - Westhoff, M. A1 - Jackisch, C. A1 - Schymanski, Stanislauv J. A1 - Weiler, M. A1 - Schulz, K. A1 - Allroggen, Niklas A1 - Tronicke, Jens A1 - van Schaik, Loes A1 - Dietrich, Peter A1 - Scherer, U. A1 - Eccard, Jana A1 - Wulfmeyer, Volker A1 - Kleidon, Axel T1 - HESS Opinions: From response units to functional units: a thermodynamic reinterpretation of the HRU concept to link spatial organization and functioning of intermediate scale catchments JF - Hydrology and earth system sciences : HESS N2 - According to Dooge (1986) intermediate-scale catchments are systems of organized complexity, being too organized and yet too small to be characterized on a statistical/conceptual basis, but too large and too heterogeneous to be characterized in a deterministic manner. A key requirement for building structurally adequate models precisely for this intermediate scale is a better understanding of how different forms of spatial organization affect storage and release of water and energy. Here, we propose that a combination of the concept of hydrological response units (HRUs) and thermodynamics offers several helpful and partly novel perspectives for gaining this improved understanding. Our key idea is to define functional similarity based on similarity of the terrestrial controls of gradients and resistance terms controlling the land surface energy balance, rainfall runoff transformation, and groundwater storage and release. This might imply that functional similarity with respect to these specific forms of water release emerges at different scales, namely the small field scale, the hillslope, and the catchment scale. We thus propose three different types of "functional units" - specialized HRUs, so to speak - which behave similarly with respect to one specific form of water release and with a characteristic extent equal to one of those three scale levels. We furthermore discuss an experimental strategy based on exemplary learning and replicate experiments to identify and delineate these functional units, and as a promising strategy for characterizing the interplay and organization of water and energy fluxes across scales. We believe the thermodynamic perspective to be well suited to unmask equifinality as inherent in the equations governing water, momentum, and energy fluxes: this is because several combinations of gradients and resistance terms yield the same mass or energy flux and the terrestrial controls of gradients and resistance terms are largely independent. We propose that structurally adequate models at this scale should consequently disentangle driving gradients and resistance terms, because this optionally allow sequifinality to be partly reduced by including available observations, e. g., on driving gradients. Most importantly, the thermodynamic perspective yields an energy-centered perspective on rainfall-runoff transformation and evapotranspiration, including fundamental limits for energy fluxes associated with these processes. This might additionally reduce equifinality and opens up opportunities for testing thermodynamic optimality principles within independent predictions of rainfall-runoff or land surface energy exchange. This is pivotal to finding out whether or not spatial organization in catchments is in accordance with a fundamental organizing principle. Y1 - 2014 U6 - https://doi.org/10.5194/hess-18-4635-2014 SN - 1027-5606 SN - 1607-7938 VL - 18 IS - 11 SP - 4635 EP - 4655 PB - Copernicus CY - Göttingen ER - TY - JOUR A1 - Schrön, Martin A1 - Rosolem, Rafael A1 - Köhli, Markus A1 - Piussi, L. A1 - Schröter, I. A1 - Iwema, J. A1 - Kögler, S. A1 - Oswald, Sascha Eric A1 - Wollschläger, U. A1 - Samaniego, Luis A1 - Dietrich, Peter A1 - Zacharias, Steffen T1 - Cosmic-ray Neutron Rover Surveys of Field Soil Moisture and the Influence of Roads JF - Water resources research N2 - Measurements of root-zone soil moisture across spatial scales of tens to thousands of meters have been a challenge for many decades. The mobile application of Cosmic Ray Neutron Sensing (CRNS) is a promising approach to measure field soil moisture noninvasively by surveying large regions with a ground-based vehicle. Recently, concerns have been raised about a potentially biasing influence of local structures and roads. We employed neutron transport simulations and dedicated experiments to quantify the influence of different road types on the CRNS measurement. We found that roads introduce a substantial bias in the CRNS estimation of field soil moisture compared to off-road scenarios. However, this effect becomes insignificant at distances beyond a few meters from the road. Neutron measurements on the road could overestimate the field value by up to 40 % depending on road material, width, and the surrounding field water content. The bias could be largely removed with an analytical correction function that accounts for these parameters. Additionally, an empirical approach is proposed that can be used without prior knowledge of field soil moisture. Tests at different study sites demonstrated good agreement between road-effect corrected measurements and field soil moisture observations. However, if knowledge about the road characteristics is missing, measurements on the road could substantially reduce the accuracy of this method. Our results constitute a practical advancement of the mobile CRNS methodology, which is important for providing unbiased estimates of field-scale soil moisture to support applications in hydrology, remote sensing, and agriculture. Plain Language Summary Measurements of root-zone soil moisture across spatial scales of tens to thousands of meters have been a challenge for many decades. The mobile application of Cosmic Ray Neutron Sensing (CRNS) is a promising approach to measure field soil moisture noninvasively by surveying large regions with a ground-based vehicle. Recently, concerns have been raised about a potentially biasing influence of roads. We employed physics simulations and dedicated experiments to quantify the influence of different road types on the CRNS measurement. We found that the presence of roads biased the CRNS estimation of field soil moisture compared to nonroad scenarios. Neutron measurements could overestimate the field value by up to 40 % depending on road material, width, surrounding field water content, and distance from the road. We proposed a correction function that successfully removed this bias and works even without prior knowledge of field soil moisture. Tests at different study sites demonstrated good agreement between corrected measurements and other field soil moisture observations. Our results constitute a practical advancement of the mobile CRNS methodology, which is important for providing unbiased estimates of field-scale soil moisture to support applications in hydrology, remote sensing, and agriculture. KW - road effect KW - field-scale KW - soil moisture KW - cosmic ray neutrons KW - mobile survey KW - COSMOS rover Y1 - 2018 U6 - https://doi.org/10.1029/2017WR021719 SN - 0043-1397 SN - 1944-7973 VL - 54 IS - 9 SP - 6441 EP - 6459 PB - American Geophysical Union CY - Washington ER - TY - JOUR A1 - Becker, Dirk A1 - Geiger, D. A1 - Dunkel, M. A1 - Roller, A. A1 - Bertl, Adam A1 - Latz, A. A1 - Carpaneto, Armando A1 - Dietrich, Peter A1 - Roelfsema, M. R. G. A1 - Voelker, C. A1 - Schmidt, D. A1 - Müller-Röber, Bernd A1 - Czempinski, Katrin A1 - Hedrich, R. T1 - AtTPK4, an Arabidopsis tandem-pore K+ channel, poised to control the pollen membrane voltage in a pH- and Ca2+- dependent manner N2 - The Arabidopsis tandem-pore K+ (TPK) channels displaying four transmembrane domains and two pore regions share structural homologies with their animal counterparts of the KCNK family. In contrast to the Shaker-like Arabidopsis channels (six transmembrane domains/one pore region), the functional properties and the biological role of plant TPK channels have not been elucidated yet. Here, we show that AtTPK4 (KCO4) localizes to the plasma membrane and is predominantly expressed in pollen. AtTPK4 (KCO4) resembles the electrical properties of a voltage-independent K+ channel after expression in Xenopus oocytes and yeast. Hyperpolarizing as well as depolarizing membrane voltages elicited instantaneous K+ currents, which were blocked by extracellular calcium and cytoplasmic protons. Functional complementation assays using a K+ transport-deficient yeast confirmed the biophysical and pharmacological properties of the AtTPK4 channel. The features of AtTPK4 point toward a role in potassium homeostasis and membrane voltage control of the growing pollen tube. Thus, AtTPK4 represents a member of plant tandem-pore-K+ channels, resembling the characteristics of its animal counterparts as well as plant-specific features with respect to modulation of channel activity by acidosis and calcium Y1 - 2004 SN - 0027-8424 ER - TY - GEN A1 - Schrön, Martin A1 - Köhli, Markus A1 - Scheiffele, Lena A1 - Iwema, Joost A1 - Bogena, Heye R. A1 - Lv, Ling A1 - Martini, Edoardo A1 - Baroni, Gabriele A1 - Rosolem, Rafael A1 - Weimar, Jannis A1 - Mai, Juliane A1 - Cuntz, Matthias A1 - Rebmann, Corinna A1 - Oswald, Sascha Eric A1 - Dietrich, Peter A1 - Schmidt, Ulrich A1 - Zacharias, Steffen T1 - Improving calibration and validation of cosmic-ray neutron sensors in the light of spatial sensitivity T2 - Postprints der Universität Potsdam : Mathematisch Naturwissenschaftliche Reihe N2 - In the last few years the method of cosmic-ray neutron sensing (CRNS) has gained popularity among hydrologists, physicists, and land-surface modelers. The sensor provides continuous soil moisture data, averaged over several hectares and tens of decimeters in depth. However, the signal still may contain unidentified features of hydrological processes, and many calibration datasets are often required in order to find reliable relations between neutron intensity and water dynamics. Recent insights into environmental neutrons accurately described the spatial sensitivity of the sensor and thus allowed one to quantify the contribution of individual sample locations to the CRNS signal. Consequently, data points of calibration and validation datasets are suggested to be averaged using a more physically based weighting approach. In this work, a revised sensitivity function is used to calculate weighted averages of point data. The function is different from the simple exponential convention by the extraordinary sensitivity to the first few meters around the probe, and by dependencies on air pressure, air humidity, soil moisture, and vegetation. The approach is extensively tested at six distinct monitoring sites: two sites with multiple calibration datasets and four sites with continuous time series datasets. In all cases, the revised averaging method improved the performance of the CRNS products. The revised approach further helped to reveal hidden hydrological processes which otherwise remained unexplained in the data or were lost in the process of overcalibration. The presented weighting approach increases the overall accuracy of CRNS products and will have an impact on all their applications in agriculture, hydrology, and modeling. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 636 KW - forested headwater catchment KW - moisture observing system KW - soil-water content KW - parameterization methods KW - scale KW - field KW - dynamics KW - observatories KW - networks Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-419134 IS - 636 SP - 5009 EP - 5030 ER -