2006年珠江入海口营养现状调查及生态危害评价

Study on nutrition variation at coastal water areas of Pearl River estuary

2006年对珠江口水质营养盐进行了3次调查,设8个监测点,据此分析水域营养现状与污染情况。调查结果表明,珠江口氮营养盐含量占很高比例,N∶P比达41.9∶1,其中超过国家海水水质4类标准包括无机氮100%超标准,无机磷20%,化学需氧量5%,珠江口溶解氧饱和度在56.2%～94.4%之间。此次调查应用营养指数法(EI)和有机污染指数(A)评价法进行分析,EI值结果显示珠江口水域各监测点均大于1已处于富营养化水平,A值结果也全部大于4显示水域已受到重污染的危险。

In order to understand the eutrophication and pollution condition of Pearl River estuary,this paper studied the water quality 3 times in 2006.The results indicated that nitrogen was main contributor to total nutrients and the ratio of N∶P reached 41.9∶1.Several nutrients value were over the fourth standard of national marine water quality,including DIN（100%）,DIP（20%） and chemical oxygen demand（5%）.The DO saturation degree of Pearl River estuary was in range of 56.2%～94.4%。 We analysed the results by nutritional index（EI） and the index of organic pollution（A）,all the EI value were bigger than 1（eutrophication）,and all the A value were bigger than 4 which indicating heavy pollution.