In this paper, seven indices including pH, SS, DO, COD, BOD, TP and NH_4+-N were measured to calculate the integrative pollution index of Shahu Lake in Ninxia and to evaluate the exterior stress on the aquatic ecosystem of the Lake.

• 以宁夏沙湖为例,选取pH值、悬浮物、溶解氧、化学耗氧量、生物耗氧量、总磷及铵氮等7项指标进行实测,并计算沙湖水体的综合污染指数,确定了水生环境的外部压力状态。