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Hydrologic Extremes and Legacy Sources Can Override Efforts to Mitigate Nutrient and Sediment Losses at the Catchment Scale
Swedish Univ Agr Sci, Sweden.
Swedish Univ Agr Sci, Sweden.
Swedish Univ Agr Sci, Sweden.
Swedish Univ Agr Sci, Sweden.
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2019 (English)In: Journal of Environmental Quality, ISSN 0047-2425, E-ISSN 1537-2537, Vol. 48, no 5, p. 1314-1324Article in journal (Refereed) Published
Abstract [en]

Combating eutrophication requires changes in land and water management in agricultural catchments and implementation of mitigation measures to reduce phosphorus (P), nitrogen (N) and suspended sediment (SS) losses. To date, such mitigation measures have been built in many agricultural catchments, but there is a lack of studies evaluating their effectiveness. Here we evaluated the effectiveness of mitigation measures in a clay soildominated headwater catchment by combining the evaluation of long-term and high-frequency data with punctual measurements upstream and downstream of three mitigation measures: limefilter drains, a two-stage ditch, and a sedimentation pond. Long-term hydrochemical data at the catchment outlet showed a significant decrease in P (-15%) and SS (-28%) and an increase in nitrate nitrogen (NO3-N, + 13%) concentrations. Highfrequency (hourly) measurements with a wet-chemistry analyzer (total and reactive P) and optical sensor (NO3-N and SS) showed that the catchment is an abundant source of nutrients and sediments and that their transport is exacerbated by prolonged drought and resuspension of stream sediments during storm events. Lime-filter drains showed a decrease in SS by 76% and total P by 80% and an increase in NO3-N by 45% compared with traditional drains, potentially indicating pollution swapping. The effectiveness of two-stage ditch and sedimentation pond was less evident and depended on the prevalent hydrometeorological conditions that drove the resuspension of bed sediments and associated sediment-bound P transport. These results suggest that increased frequency of prolonged drought due to changing weather patterns and resuspension of SS and sediment-bound P during storm events can override the generally positive effect of mitigation measures.

Place, publisher, year, edition, pages
AMER SOC AGRONOMY , 2019. Vol. 48, no 5, p. 1314-1324
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:liu:diva-161198DOI: 10.2134/jeq2019.02.0063ISI: 000485719700016PubMedID: 31589708OAI: oai:DiVA.org:liu-161198DiVA, id: diva2:1365680
Note

Funding Agencies|Swedish Farmers Foundation for Agricultural Research [O-16-23-640]; Marie Sklodowska-Curie Fellowship (European Commission) [657192]; Foundation AForsk [17-373]; Carl Tryggers Foundation [CTS 17: 59]

Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25

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  • apa
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