Trend-analysis of eutrophication variables in lakes in The Netherlands

摘要: Abstract A trend-analysis of eutrophication variables was performed for a large number lakes in The Netherlands. Data total 231 were available. on chlorophyll-a, phosphorus (total-P) and nitrogen (total-N) analysed over the period 1980–1996. Summer-averaged concentrations total-P total-N decreased respectively 65%, 73% 75% with at least eight years data between 1980 1996. Results winter means comparable (a negative trend 54%, 77% 69% respectively). Since median decrease summer averaged is 2.61 μg l−1 y−1, 0.008 mg y−1 0.046 respectively, illustrating effects (inter)national regional measures to combat eutrophication.