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Hydrogeomorphic Pothole Types in Agricultural Landscapes of East-Brandenburg

Centre for Agricultural Landscape and Land Use Research (ZALF). Hydrogeomorphic Pothole Types in Agricultural Landscapes of East-Brandenburg. Thomas Kalettka. ZALF, Institute of Hydrology, tkalettka@zalf.de. Agricultural landscape with potholes in spring.

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Hydrogeomorphic Pothole Types in Agricultural Landscapes of East-Brandenburg

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  1. Centre for Agricultural Landscape and Land Use Research (ZALF) Hydrogeomorphic Pothole Types in Agricultural Landscapes of East-Brandenburg Thomas Kalettka ZALF, Institute of Hydrology, tkalettka@zalf.de

  2. Agricultural landscape with potholes in spring

  3. Soll (German); pothole, kettle hole (English) = glacially shaped isolated depression within the sink of an internal catchment inthe young moraine landscape standing water or wetland respectively - water area </= 1 ha- - depression area </= 3 ha - hydrogeomorphic (HGM) type (Brinson 1993): isolated depression with vertical water fluctuation

  4. Water regime of potholes in agricultural landscapes of East-Brandenburg Mapping of wetness 1993-2002

  5. Cross section Morphological parameters of a pothole Top view EB = Edge border TSB = Top shore border BSB = Bottom shore border HwL = High water line MwL = Middel water line

  6. Classification of hydrogeomorphic variables of potholes

  7. Factor analysis of hydrogeomorphic variables of potholes (n=144) extraction: main components; factor rotation: varimax; results: factor loadings of variables, marked loadings  0,65

  8. Cluster analysis for derivation of hydrogeomorphic pothole types Example: Cluster of shallow potholes (n=95, mean values, K-Means-Cluster analysis) WR = Water regime; SBT = Shore overflow tendency, CA = Catchment area; PA = Pothole area at top shore; SS = Shore slope

  9. Hydrogeomorphic types of potholes in agricultural landscapes WR = Water Regime 1: never, 2: episodic (temporary, 3: periodic (seasonal), 4: semipermanent, 5: permanent

  10. Short form of the determination key for water bearing hydrogeomorphic pothole types MD = max. depth; SS = Shore slope; OT = overflow tendency; PA = pothole area; CA = catchment area; WR = water regime; CR = catchment relief

  11. HGM-type:Big deep storage type Dom. veg.:Edge type with shore woods (Sambucus nigra, Salix cinerea)

  12. HGM-type: Small shallow shore overflow type Dom. vegetation: Edge type with Phalaris-reed (P. arundinacea)

  13. HGM-type: Bigshallow shore overflow type Dom. veg.: Full reedtype with sedges(C. elata) and reed (P. australis)

  14. HGM-type: Big shallow shore overflow type + peaty island Dominant vegetation: Wood type with Betula stand (B. pubescens)

  15. HGM-type: Big shallow storage type Dominant vegetation: Full reed type (Phragmites australis)

  16. HGM-type: Small wadeable overflow type Dominant vegetation: Full reed type (Phalaris arundinacea)

  17. HGM-type: Puddle type Dominant vegetation: Annual herbs

  18. Example of a target image for a hydrogeomorphic pothole type

  19. Potential abiotic functions for HGM pothole types in the agricultural landscape 0 – no x - low xx – moderate xxx - high other functions: source function (groundwater recharge, gas emission) microclimat. function (slowing down of wind, local humidity)

  20. Potential habitat functions for vegetation of HGM pothole types in the agricultural landscape 0 – no x - low xx – moderate xxx - high Other functions: Hideaway for endangered species of open landscape Stepping stone in the biotope integrated system

  21. Distribution of hydrogeomorphic pothole types depending on landscape relief slightly to middle rolling ground moraine 78 % small, 36 % wadeable, 52 % shore overflow hilly rolling ground moraine 88 % big, 6 % wadeable, 38 % shore overflow

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