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Efficiency of a constructed wetland for retention of sediment-associated phosphorus
IFM Biology, Section Ecology, Linköping University, Linköping, Sweden.
WRS Uppsala AB, Uppsala, Sweden.
IFM Biology, Section Ecology, Linköping University, Linköping, Sweden.
2011 (English)In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 674, no 1, p. 179-190Article in journal (Refereed) Published
Abstract [en]

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 4 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 4 years was 65 kg ha-1 and intensive sampling events detected 69% as PP. Based on inflow-outflow estimates the mean P retention was 2.8 kg ha-1 year-1, 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. © 2011 Springer Science+Business Media B.V.

Place, publisher, year, edition, pages
Dordrecht: Springer Netherlands, 2011. Vol. 674, no 1, p. 179-190
Keyword [en]
Constructed wetland, Diffuse pollution, Long-term retention, Particulate phosphorus, Sediment accretion, Sediment phosphorus fractions
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:hh:diva-20295DOI: 10.1007/s10750-011-0728-yISI: 000293163900013Scopus ID: 2-s2.0-79960739072OAI: oai:DiVA.org:hh-20295DiVA, id: diva2:582382
Note

Ingår i avhandling: Analysis of phosphorus retention variations in constructed wetlands receiving variable loads from arable land

Available from: 2013-01-04 Created: 2013-01-04 Last updated: 2018-03-22Bibliographically 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. p. 28
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: 2018-03-22Bibliographically approved

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Johannesson, Karin M.

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