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Analysis of phospho...
Analysis of phosphorus retention variations in constructed wetlands receiving variable loads from arable land
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- Johannesson, Karin, 1982- (författare)
- Linköpings universitet,Ekologi,Tekniska högskolan,Wetland Ecology,Linköping University, Linköping, Sweden
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- Tonderski, Karin, Associate professor (preses)
- Linköpings universitet,Ekologi,Tekniska högskolan,Linköping University, Linköping, Sweden
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- Kjaergaard, Charlotte, Dr. (opponent)
- Århus universitet, Danmark
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- Weisner, Stefan (preses)
- Högskolan i Halmstad, Våtmarkscentrum
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(creator_code:org_t)
- ISBN 9789173931687
- Linköping : Linköping University Electronic Press, 2011
- Engelska 28 s.
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Serie: Linköping Studies in Science and Technology. Thesis, 0280-7971 ; 1482
- Relaterad länk:
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https://liu.diva-por... (primary) (Raw object)
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https://liu.diva-por...
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https://hh.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://urn.kb.se/re...
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Abstract
Ämnesord
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- 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.
Nyckelord
- NATURAL SCIENCES
- NATURVETENSKAP
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