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自2004以来,对黄河下游(山东段)的渔业生态环境进行连续7年的调查,结果表明:黄河干流水体的氨氮、亚硝酸盐、硝酸盐含量的年际变化规律不明显;上游的总氮含量表现为先上升后下降,河口段则表现为总体上升;2个监测站的总磷含量都有明显下降趋势;高锰酸钾指数7年内均表现平稳。采用综合营养状态指数法评价黄河下游(山东段)的营养状态,7年内营养化状态处于中度营养到(中度)富营养。定性评价为良好～中度污染。
Since 2004, the fisheries eco-environment in the lower reaches of the Yellow River (Shandong section) has been continuously investigated for seven years. The results show that there is no obvious interannual variation of ammonia nitrogen, nitrite and nitrate content in the mainstream of the Yellow River; The contents of total phosphorus in the two monitoring stations all decreased obviously. The potassium permanganate index all showed stable in 7 years. The nutritional status of the lower reaches of the Yellow River (Shandong section) was evaluated by comprehensive nutritional status index method, and the eutrophic status was moderate to (moderately) eutrophic within 7 years. Qualitatively evaluated as good to moderately polluting.