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Dissolved phosphorus transport from soil to surface water in catchments with different land use
Authors:Dries Verheyen  Nele Van Gaelen  Benedicta Ronchi  Okke Batelaan  Eric Struyf  Gerard Govers  Roel Merckx  Jan Diels
Affiliation:1.Department of Earth and Environmental Sciences,Leuven,Belgium;2.Department of Earth and Environmental Sciences,Leuven,Belgium;3.Department of Earth Sciences,Flinders University,Adelaide,Australia;4.Department of Biology,University of Antwerp,Wilrijk,Belgium;5.Department of Earth and Environmental Sciences,Leuven,Belgium;6.Department of Earth and Environmental Sciences,Leuven,Belgium
Abstract:
Diffuse phosphorus (P) export from agricultural land to surface waters is a significant environmental problem. It is critical to determine the natural background P losses from diffuse sources, but their identification and quantification is difficult. In this study, three headwater catchments with differing land use (arable, pasture and forest) were monitored for 3 years to quantify exports of dissolved (<0.45 µm) reactive P and total dissolved P. Mean total P exports from the arable catchment ranged between 0.08 and 0.28 kg ha?1 year?1. Compared with the reference condition (forest), arable land and pasture exported up to 11-fold more dissolved P. The contribution of dissolved (<0.45 µm) unreactive P was low to negligible in every catchment. Agricultural practices can exert large pressures on surface waters that are controlled by hydrological factors. Adapting policy to cope with these factors is needed for lowering these pressures in the future.
Keywords:
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