Evaluation of the Water Ecological Health of the Watershed Upstream of Miyun Reservoir(Beijing Section)
As an important drinking water source in Beijing,it is of great significance to carry out watershed aquatic ecological health assess-ment and analyze the key influencing factors affecting aquatic ecological health for aquatic ecological protection in the watershed upstream of Miyun Reservoir.Based on the habitat,water quality and aquatic organisms data of 20 small watersheds upstream of Miyun Reservoir,and combining with the ecological status of the mountainous watersheds upstream of Miyun Reservoir,we built an evaluation index system cover-ing 10 indexes in 3 categories,namely,habitat structure,water quality and aquatic organisms,and utilized the comprehensive health index method based on the entropy method to comprehensively evaluate the health of the aquatic ecosystems of the watersheds.The results show that:the health status of the water ecosystem in the upper basin of Miyun Reservoir is generally sub-healthy,with 10%of the sub-watersheds in the healthy grade;65%of the sub-watersheds in the sub-healthy grade;and 25%of the sub-watersheds in the general grade.The health status of aquatic ecosystems in the watershed upstream of Miyun Reservoir has strong spatial heterogeneity,the areas with higher health grades mainly distributed in the upper reaches of the Baimaguan River,the Liuli River,the middle reaches of the Tanghe River and the up-per reach of the Tianhe River,and those with relatively lower health grades are mainly distributed in the Chaohe River,the middle and lower reaches of the Baihe River,the lower reaches of the Tanghe River,the Qingshui River,and the upper reaches of the Andamu River.Anthro-pogenic disturbance and surface source pollution,low vegetation cover and soil erosion are the key factors affecting the water ecological health of the upper Miyun Reservoir watershed.
water ecological healthhabitat structurewater qualityaquatic organismsupstream watershed of Miyun Reservoir
国家科技期刊平台
NSTL
万方数据
