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Efficiency of a con...
Efficiency of a constructed wetland for retention of sediment associated phosphorus
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- Johannesson, Karin, 1982- (författare)
- Linköpings universitet,Ekologi,Tekniska högskolan,Wetland Ecology,IFM Biology, Section Ecology, Linköping University, Linköping, Sweden
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- Andersson, Jonas (författare)
- WRS Uppsala AB, Uppsala, Sweden
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- Sundblad-Tonderski, Karin (författare)
- Linköpings universitet,Ekologi,Tekniska högskolan,IFM Biology, Section Ecology, Linköping University, Linköping, Sweden
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(creator_code:org_t)
- 2011-05-12
- 2011
- Engelska.
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Ingår i: Hydrobiologia. - Dordrecht : Springer. - 0018-8158 .- 1573-5117. ; 674:1, s. 179-190
- Relaterad länk:
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https://liu.diva-por... (primary) (Raw object)
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http://liu.diva-port...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- A constructed wetland (2.1 ha; 2% of catchment area) in southeast Sweden, in a catchment with 35% arable land on clay soils, was investigated with respect to phosphorus (P) retention, focusing on particulate P (PP) and sediment accretion. The aims were to i) estimate P retention and identify the dominating retention processes; ii) investigate how well estimates of P retention based on inflow-outflow measurements compared with the amount of P accumulated in the sediment. In- and outflow of P was measured during four years with continuous flow measurements and flow proportional weekly composite samples. P in the accumulated sediment was estimated based on core samples and analyzed using sequential fractionation. Total P load during four years was 65 kg/ha and intensive sampling events detected 69% as PP. Based on inflow-outflow estimates the mean P retention was 2.8 kg/ha/yr, or 17%, but the amount of P accumulated in the inlet zone equated 78% of the TP load. This discrepancy showed the need to add studies of sediment accumulation to inflow-outflow estimates for an improved understanding of the P retention. The dominating P forms in the sediment were organic P (38%) and P associated with iron or aluminum (39%), i.e. potentially mobile forms. In areas colonized by Typha latifolia, the amount of P in the upper sediment layer (390 kg) was more than double the total P load of 136 kg. Cycling and release in those areas is a potential source of P that deserves further attention.
Ämnesord
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Nyckelord
- Constructed wetland
- long-term retention
- diffuse pollution
- particulate phosphorus
- sediment accretion
- sediment phosphorus fractions
- Freshwater ecology
- Limnisk ekologi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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