Phosphorus retention in a newly constructed wetland receiving agricultural tile drainage
2013 (English)In: Journal of Environmental Quality, ISSN 0047-2425, Vol. 42, no 2, 596-605 p.Article in journal (Refereed) Published
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.
IdentifiersURN: urn:nbn:se:liu:diva-89832DOI: 10.2134/jeq2012.0266ISI: 000315942600032OAI: oai:DiVA.org:liu-89832DiVA: diva2:609897
ProjectsPhosphorus wetlands, funded by Swedish Farmers’ Foundation (SLF)