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Phosphorus retention in a newly constructed wetland receiving agricultural tile drainage
Swedish University of Agricultural Sciences, Uppsala, Sweden.
Swedish University of Agricultural Sciences, Uppsala, Sweden.
Swedish University of Agricultural Sciences, Uppsala, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Ecology. Linköping University, The Institute of Technology.
2013 (English)In: Journal of Environmental Quality, ISSN 0047-2425, Vol. 42, no 2, 596-605 p.Article in journal (Refereed) Published
Abstract [en]

One measure used in Sweden to mitigate eutrophication of watersis the construction of small wetlands (free water surface wetland forphosphorus retention [P wetlands]) to trap particulate phosphorus(PP) transported in ditches and streams. Th is study evaluated Pretention dynamics in a newly constructed P wetland serving a 26-haagricultural catchment with clay soil. Flow-proportional compositewater samples were collected at the wetland inlet and outlet over 2yr (2010–2011) and analyzed for total P (TP), dissolved P (DP),particulate P (PP), and total suspended solids (TSS). Both wintershad unusually long periods of snow accumulation, and additionaltime-proportional water samples were frequently collected duringsnowmelt. Infl ow TP and DP concentrations varied greatly (0.02–1.09 mg L−1) during the sampling period. During snowmelt in 2010,there was a daily oscillation in P concentration and water fl ow inline with air temperature variations. Outfl ow P concentrationswere generally lower than infl ow concentrations, with net P lossesobserved only in August and December 2010. On an annual basis,the wetland acted as a net P sink, with mean specifi c retentionof 69 kg TP, 17 kg DP, and 30 t TSS ha−1 yr−1, corresponding toa reduction in losses of 0.22 kg TP ha−1 yr−1 from the agriculturalcatchment. Relative retention was high (36% TP, 9% DP, and36% TSS), indicating that small constructed wetlands (0.3% ofcatchment area) can substantially reduce P loads from agriculturalclay soils with moderately undulating topography.

Place, publisher, year, edition, pages
American Society of Agronomy , 2013. Vol. 42, no 2, 596-605 p.
National Category
Environmental Sciences
URN: urn:nbn:se:liu:diva-89832DOI: 10.2134/jeq2012.0266ISI: 000315942600032OAI: diva2:609897
Phosphorus wetlands, funded by Swedish Farmers’ Foundation (SLF)
Available from: 2013-03-07 Created: 2013-03-07 Last updated: 2013-04-11

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