关键词: 污染评价;水质综合污染指数;生物多样性指数;长江口南支水域;

Abstract: In this paper,we used the water comprehensive pollution index and biodiversity index(Shannon-Weiner index) to analyze the water pollution of the South Branch of the Changjiang River estuary in spring and autumn in 2020,and evaluated the results of each analysis method. The results indicated that the pollution level of the South Branch of the Changjiang River estuary were slight pollution to heavy pollution,and decreased from upstream to downstream. The results of water quality evaluated by water comprehensive pollution index were slight pollution and heavy pollution. The result of water quality evaluated by phytoplankton Shannon-Weiner index were slight-moderate pollution to heavy pollution. The result of water quality evaluated by zooplankton Shannon-Weiner index were slight pollution to heavy pollution. The variation trend of evaluation results of water comprehensive pollution index and zooplankton Shannon-Weiner index were generally consistent. Among these three methods,the evaluation results of the zooplankton Shannon-Weiner index was relatively moderate,which was a relatively good evaluation indicator for the degree of water pollution.

Key words: pollution assessment; water comprehensive pollution index; biodiversity index; South Branch of the Changjiang River estuary;