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Phosphorus load variations and retention in non-point source wetlands in southern Sweden
Linköping University, Department of Physics, Chemistry and Biology, Ecology . Linköping University, The Institute of Technology. (Wetland Ecology)
Linköping University, Department of Physics, Chemistry and Biology, Ecology . Linköping University, The Institute of Technology.
Ekologgruppen i Landskrona AB, Sweden.
Halmstad University, Sweden. (Wetland Research Centre)
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(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.

National Category
Ecology
Identifiers
URN: urn:nbn:se:liu:diva-67877OAI: oai:DiVA.org:liu-67877DiVA: diva2:413994
Available from: 2011-05-02 Created: 2011-05-02 Last updated: 2011-05-10Bibliographically 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)
Abstract [en]

Seven wetlands, constructed on agricultural land in the south of Sweden, were investigated with respect to phosphorus (P) retention. The overall aim was to increase the understanding of P retention and find possible explanations for the variations in retention that have been observed in previous studies. This was done by i) investigating P retention in wetlands receiving various water and P loads, ii) investigating the effect of variations in water flow on P transport, iii) comparing how well retention estimates based on water quality data agreed with measurements of the amount of P accumulated in the sediment.

Results showed that P retention was positive in all wetlands, but it was variable (1–58 kg ha-1 yr-1) and months with negative retention were observed in nearly all wetlands. Such  monthly negative retention coincided with i) high flow periods, when particulate P was either flushed straight through the wetlands or resuspended from the bottoms, and ii) warm low flow periods, in which case dissolved P was probably released from wetland sediments due to anoxic conditions.

The results from the two methods for estimating P retention differed. Based on water quality data, the total P load during four years was 65 kg ha-1 and the mean P retention 2.8 kg ha-1 yr-1, or 17% of the total P load. In contrast, the amount of P accumulated in the inlet zone alone amounted to 78% of the P load, and the P content in the upper sediment of the whole wetland area exceeded the P load with a factor four. This discrepancy showed the need to add studies of sediment accumulation to inflow-outflow estimates for an improved understanding of wetland P retention.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2011. 28 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1482
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-67893 (URN)LIU-TEK-LIC-2011:21 (Local ID)978-91-7393-168-7 (ISBN)LIU-TEK-LIC-2011:21 (Archive number)LIU-TEK-LIC-2011:21 (OAI)
Presentation
2011-05-25, Schrödinger, E324, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2011-05-10 Created: 2011-05-02 Last updated: 2011-05-10Bibliographically approved

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Johannesson, KarinTonderski, Karin

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