Case studies and reviews. Analysis of current policies and alternative strategies for the reduction of nutrient loads on eutrophicated lakes: The example of Slapton Ley, Devon

Abstract

Abstract The efficacy of strategies to reduce external nutrient loads to eutrophicated lakes may be evaluated using the example of Slapton Ley, a freshwater Site of Special Scientific Interest in south‐west England. The results of this study suggest that, in dealing with eutrophication, a reduction in point‐source loads is important, but attention must also be given to non‐point, agricultural sources. One measure which would appear to be effective against diffuse nutrient export from farmland involves the creation of woodland buffer zones along the courses of the rivers draining into the Ley. Problems arise in the implementation of strategies since it is concluded that no current EC or UK national legislation addresses the problem of freshwater eutrophication in a comprehensive manner. Forthcoming Statutory Water Quality Objectives may be instrumental in providing the legal means by which such reductions could be achieved, if the importance of diffuse sources from agriculture is acknowledged.