基于ASSETS的长江口海域富营养化评价——2002年以来人为影响压力趋势分析

Eutrophication evaluation in Changjiang river estuary based on ASSETS——trend analysis on overall human influence from 2002

利用总人为影响的比值评价了2002年以来人类活动对长江口海域的压力及其变化趋势,结果表明:6 a间总人为影响比值均大于0.8,属于人为影响级别中最高的一种,但总体呈现出降低的趋势;人为影响压力的降低与长江径流量及其无机氮物质通量有直接关系,此外,长江三峡工程的拦洪、蓄水等功能的正常运转及"十五"期间长江上游的生态建设工程等亦在一定程度上减轻了长江口的污染负荷。

In this paper, the assessment on the pressure of human activity in Changjiang River Estuary was made using all of the human influence. The results are as follows： （ 1 ） the ratio of OHI are higher than 0. 8, belonging to the highest influence grade; （ 2 ） the trend of OHI of 2002 - 2007 declined gradually, which relates to the reduction of the Changjiang river flux of dissolved inorganic nitrogen （DIN） since 2002, partly probably with Three Gorges Project and the Chang Jiang upriver ecology construction of the 10th five program.