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The effectiveness of field wetlands in retaining pollutants from agricultural runoff: case studies from the UK

Research output: Contribution in Book/Report/ProceedingsPaper

Published

Publication date2012
Host publicationAgriculture and the Environment IX: Valuing Ecosystems: Policy, Economic and Management Interactions
EditorsKaren McCracken
Place of publicationEdinburgh
Pages244-249
Number of pages6
ISBN (Electronic)1854829963
Original languageEnglish

Abstract

Field wetlands are one option available to farmers for mitigation of diffuse pollution from agriculture. Although used worldwide, there is little evidence for their effectiveness in the UK agricultural landscape. This paper describes the construction and monitoring of ten wetlands in the UK, with different combinations of soil type, wetland design, wetland size and runoff source. In the first two years after construction, all the wetlands trapped a substantial amount of sediment, with sandy sites having the highest trapping rates (>0.5 t ha-1 yr-1), followed by silty sites (0.02–0.4 t ha-1 yr-1) and clay sites (0.01–0.07 t ha-1 yr-1), although the lower rainfall at the clay sites was a confounding factor. Phosphorus trapping rates in the first year varied from 0.006–1 kg ha-1 yr-1. Overall, small field wetlands were shown to be an effective land management option for trapping sediment and nutrients.