caa a22 4500 445892196 CHVBK 20180317145620.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s10750-011-0728-y doi (NATIONALLICENCE)springer-10.1007/s10750-011-0728-y Efficiency of a constructed wetland for retention of sediment-associated phosphorus [Elektronische Daten] [Karin Johannesson, Jonas Andersson, Karin Tonderski] A constructed wetland (2.1ha; 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 4years 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 65kg ha−1 and intensive sampling events detected 69% as PP. Based on inflow-outflow estimates the mean P retention was 2.8kgha−1year−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 (390kg) was more than double the total P load of 136kg. Cycling and release in those areas is a potential source of P that deserves further attention. Springer Science+Business Media B.V., 2011 Constructed wetland nationallicence Long-term retention nationallicence Diffuse pollution nationallicence Particulate phosphorus nationallicence Sediment accretion nationallicence Sediment phosphorus fractions nationallicence Johannesson Karin IFM Biology, section Ecology, Linköping University, 581 83, Linköping, Sweden aut Andersson Jonas WRS Uppsala AB, 753 22, Uppsala, Sweden aut Tonderski Karin IFM Biology, section Ecology, Linköping University, 581 83, Linköping, Sweden aut Hydrobiologia Springer Netherlands 674/1(2011-10-01), 179-190 0018-8158 674:1<179 2011 674 10750 https://doi.org/10.1007/s10750-011-0728-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0728-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Johannesson Karin IFM Biology, section Ecology, Linköping University, 581 83, Linköping, Sweden aut NATIONALLICENCE 700 1- Andersson Jonas WRS Uppsala AB, 753 22, Uppsala, Sweden aut NATIONALLICENCE 700 1- Tonderski Karin IFM Biology, section Ecology, Linköping University, 581 83, Linköping, Sweden aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 674/1(2011-10-01), 179-190 0018-8158 674:1<179 2011 674 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer