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Phosphorus load variations and retention in non-point source wetlands in southern Sweden
Institutionen för fysik, kemi och biologi, Ekologi, Linköpings universitet, Linköping, Sverige.
Institutionen för fysik, kemi och biologi, Ekologi, Linköpings universitet, Linköping, Sverige.ORCID iD: 0000-0002-0722-6083
Ekologgruppen i Landskrona AB, Landskrona, Sverige.
Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Environmental Science, Wetland Research Centre.ORCID iD: 0000-0003-4297-8683
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2011 (English)Manuscript (preprint) (Other academic)
Abstract [en]

Data from seven constructed wetlands receiving runoff from agricultural catchments in the south of Sweden were investigated with respect to phosphorus (P) retention. The seven wetlands differed in size (0.22-2 ha), design, land use and catchment characteristics. The hydraulic load varied between 7 and 725 m yr-1, which reflect the different geographical and hydrological conditions. The overall aim of this study was to increase the understanding of how water flow and inflow P concentration varations affect the P retention in constructed wetlands receiving runoff from arable land. Water flow was measured continuously, and time or flow proportional water samples were taken. Grab samples were taken during high flow periods and also to supplement the automatic water sampling. P retention varied between wetlands, from 1 to 58 kg ha-1 yr-1, and was correlated to the P load (R2=0.9, p<0.05). P retention in the wetlands varied strongly between years, and negative retention was recorded for some years and wetlands. When investigating monthly retention for each wetland, release of P corresponded to either high flow or possible anoxic conditions during low-flow periods in summer or during winter when ice covered the wetlands. Analyses of grab samples revealed a relationship between TP concentration and water flow for most wetlands. In some wetlands, P was transported mainly as particulate P (PP), but in other wetlands, soluble P was the dominating form in both inflow and outflow. Incoming concentrations varied greatly between wetlands (1-2000 μg l-1) which reflected the different catchment characteristics, e.g. land use, soil type and topography.

Place, publisher, year, edition, pages
2011.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:hh:diva-20141ISBN: 978-91-7393-168-7 (print)OAI: oai:DiVA.org:hh-20141DiVA: diva2:577098
Available from: 2012-12-14 Created: 2012-12-14 Last updated: 2017-05-17Bibliographically approved
In thesis
1. Analysis of phosphorus retention variations in constructed wetlands receiving variable loads from arable land
Open this publication in new window or tab >>Analysis of phosphorus retention variations in constructed wetlands receiving variable loads from arable land
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Linköping: Department of Physics, Chemistry and Biology, Linköping University, 2011. 28 p.
Series
Linköping Studies in Science and Technology, ISSN 0280-7971 ; 1482
National Category
Natural Sciences
Identifiers
urn:nbn:se:hh:diva-20140 (URN)978-91-7393-168-7 (ISBN)
Supervisors
Available from: 2013-01-04 Created: 2012-12-14 Last updated: 2013-11-15Bibliographically approved

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