最新大江大河污染及治理情况的调查.doc

大江大河污染及治理情况的调查
of rural drinking water sources, protection of drinking water sources in rural areas by the end 条主要干流上的72个监测断面，能到达三类以上水质的断面已只有46个。与此同时，，半数以上也都已处于不同程度的富营养化状态，其中杭州西湖、南京玄武湖、武汉东湖等，均到达了富营养化程度。
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
　　长江污水排放总量远远超过黄河、淮河
　　长江污水排放总量远远超过黄河、淮河，但由于长江水量大，尚有一定的自净能力，因此一定程度上掩盖了污染的严重性。
　　中国地质大学教授袁爱国说，即使在目前长江污染已经不容小觑的情况下，许多地方领导还觉得，“长江水大，污染点没啥〞。
　　实际上，三类水体变成四类和五类水体的速度很快，通常也就是三五年时间。国家水文局去年两月份的监测资料显示，长江流域现在一二类水体的比例已只占31%，三类水占34%，其余都是四类、五类和劣五类水。五年后，长江70%左右的水体都变成三类以下水体，是完全有可能的。
　　澳籍华裔科学家刘光钊说，如果长江70%左右的水都变成四类、五类和劣五类水，首先带来的灾难就是长江中局部水生生物将面临灭绝危险，长江的生物多样性会被破坏，食物链会断裂，蓝藻等会大面积爆发，生态平衡会被彻底打破，长江也将变成一江死水。
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
　　华东师范大学教授陆健健说，上世纪80年代中期，长江口能观测到的水生底栖动物共有126种，到2022年，能观测到的已只剩下52种。大量有机物