Prediction of contributing areas for Phosphorus losses from agricultural land
In many situations, diffuse P-losses from grassland are generated on a limited part of a catchment (critical source areas CSAs). In a previous study, a parsimonious hydrological model has been developed to predict the spatial extent of CSAs (Lazzarotto et al., 2006). In this project, the existing model has been developed and tested further to address the following research questions:
(1) Is the existing parsimonious model, calibrated in the lake Sempach catchment, transferable to other similar regions and can it thus build the basis for further research on contributing areas for P-losses?
(2) How does recently applied manure affect runoff behavior and P-losses? What are the factors controlling incidental P loss (IPL) from manure?
(3) How should the model be extended to account for recent manure application, for connectivity (field – stream) and drainage without overparameterization?
(4) How certain / reliable / useable are the model predictions? How can the spatial predictions be assessed? Is the model capable to evaluate mitigation options / management strategies?
(5) Which
management strategies / mitigation options are advisable?
Status
finished
Contractor
SBF, within COST Action 869 on “Mitigation options for nutrient reduction
in surface water and groundwaters”.
Publications
Hahn, C., V. Prasuhn, C. Stamm, and R. Schulin. 2012. Phosphorus losses in runoff from manured grassland of different soil P status at two rainfall intensities. Agriculture, Ecosystems and Environment 153:65 - 74.