1 Water Quality of Potholes in Agricultural Landscapes of East-Brandenburg (Germany) Centre for Agricultural Landscape and Land Use Research (ZALF) Thomas Kalettka 1 & Catrin Rudat 2 1 ZALF, Institute for Hydrology, [email protected]2 Umweltplan Stralsund Gmbh, [email protected]
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1 Water Quality of Potholes in Agricultural Landscapes of East-Brandenburg (Germany) Centre for Agricultural Landscape and Land Use Research (ZALF) Thomas.
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Water Quality of Potholes in Agricultural Landscapes of East-Brandenburg
(Germany)
Centre for Agricultural Landscape and Land Use Research (ZALF)
Characteristics of potholes eutrophication :- summer period: dense hydrophyte stands with reduced species number- winter period: maximum of algae- cyclic reduced oxygen: internal matter loading from the sediment
6
Correlation between phytoplancton and macrophytes
B-S
PF
B-2
07c
B-2
03
B-I
I /8
L -20
L -19
L -18
b
L -18
L -13
B-2
05
B-B
Fa
B-K
LAP
F
BA
PF
0
20
40
60
80
100
120
Ch
loro
ph
y ll A
[µ g
/l ]
MV March-Nov. MV June-Sept.
Macrophytes
dominant
Macrophytes not
dominant
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Analysis of bioavailability of phosphorus from sediments
(2,5-2,9 = eutroph; 3,0-3,4 = high eutroph; 3,5-3,9 = polytroph; 4,0-4,4 = high polytroph)
low trophic level within arable land = low matter loading disposition big potholes with wide buffer strips (high buffer capacity) small potholes within small slightly rolling catchment (low soil erosion) lacking of input from drainages soil ramparts at the upper shore (high buffer capacity)
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Correlation between trophic level and matter loading dispositionof potholes
n = 29; r = 0,79; significant p < 0,001
Assessment of matter loding disposition (MLD) by score system:
MLD = Total (matter loading factors) – Total (buffer capacity of pothole)
Chl. A, MV 3-11, after melting of ice cover [mg/l]
Only if macrophytes not dominant 1* </= 3 </= 10 </= 40 </= 60 > 60
Macrophytes/filamentous green algae 2*
Visible depth, MV 3-11 [m]
After melting of ice cover, use only if water level is deep enough for whole year
- >/= 4 >/= 1,5 >/= 1,0 >/= 0,5 >/= 0,2 < 0,2
Water quality classification of potholes (modified after Klapper 1992)
1* - Sum coverage of macrophytes + filamentous green algae </= 50 %
2* - Coverage % of whole surface water area with litoral charakter (maximum of vegetation period), Trophic level indication by species combinations, use only if sum of coverage of macrophytes/filamentous green algae >/= 25 %
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Species name Trophic level
N* NO3 NH4 P I°
Floating covers / pleustophytes
Lemna gibba 3-4 8 rich rich rich
Lemna minor 2,5-3-4 6 5,0
Spirodela polyrhiza (2)-3 6 rich 5,0
Wolffia arrhiza 3 6
Suspendes mats / pleustophytes
Lemna trisulca (2)-3-(4) 5 moderate
Ceratophyllum submersum (2)-3, 4 7
Ceratophyllum demersum (2)-3, 4 8 rich rich
Fadengrünalgen 3-4
Riccia fluitans 2-2,9 poor moderate
Utricularia vulgaris 2-3 4 poor-moderate
Rooted floating leaf lawn / rhizophytes
Nuphar lutea 2-3-4 6
Potamogeton natans 1-3 5 2,5
Ranunculus aquatilis 3 6
Polygonum amphibium 2-3-4 4 not rich
Rooted submersed plants /rhizophytes
Potamogeton crispus 3-4 5 4,5
Potamogeton acutifolius 3 6
Myriophyllum spicatum 2,5-3-4 7 not rich 3,0
Hottonia palustris 2-3 4 not high
Trophic level indication of standing waters by hydrophytes (literature)