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Title (Primary) Management options to reduce phosphorus leaching from vegetated buffer strips
Author Hille, S.; Graeber, D.; Kronvang, B.; Rubæk, G.H.; Onnen, N.; Molina-Navarro, E.; Baattrup-Pedersen, A.; Heckrath, G.J.; Stutter, M.I.;
Journal Journal of Environmental Quality
Year 2019
Department ASAM;
Volume 48
Issue 2
Language englisch;
POF III (all) T31;
Supplements https://dl.sciencesocieties.org/publications/jeq/supplements/48/322-supplement1.pdf
https://dl.sciencesocieties.org/publications/jeq/supplements/48/322-supplement2.pdf
Abstract Vegetated buffer strips (VBS) between agricultural areas and surface waters are important retention areas for eroded particulate P through which they may obtain critically high degrees of P saturation imposing high risk of soluble P leaching. We tested topsoil removal and three harvesting frequencies (once, twice, or four times per year) of natural buffer vegetation to reduce P leaching with the aim to offset erosional P accumulation and high degrees of P saturation. We used a simple numerical time-step model to estimate changes in VBS soil P levels with and without harvest. Harvesting offset erosional deposition as it resulted in an annual ammonium oxalate-extractable P reduction of 0.3 to 2.8% (25-cm topsoil content) in soils of the VBS and thus, with time, reduced potential P leaching below a baseline of 50 μg L−1. Topsoil removal only marginally reduced potential leaching at two sites and not anywhere near this baseline. The harvest frequency only marginally affected the annual P removal, making single annual harvests the most economical. We estimate 50 to 300 yr to reach the P leaching baseline, due to substantial amounts of P accumulated in the soils. Even in high-erosion-risk situations in our study, harvesting reduced soil P content and the P leaching risk. We suggest harvesting as a practical and efficient management to combat P leaching from agricultural VBS, not just for short-term reductions of dissolved P, but also for reductions of the total soil P pool and for possible multiple benefits for VBS.
ID 20762
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=20762
Hille, S., Graeber, D., Kronvang, B., Rubæk, G.H., Onnen, N., Molina-Navarro, E., Baattrup-Pedersen, A., Heckrath, G.J., Stutter, M.I. (2019):
Management options to reduce phosphorus leaching from vegetated buffer strips
J. Environ. Qual. 48 (2), 322 - 329