沙湖水体富营养化评价及防治对策

Water Eutrophication Assessment and Its Countermeasures for Shahu Lake

本文采用营养状态指数法对沙湖营养状况进行综合评价。评价结果表明,沙湖富营养化日趋严重,已经由2002年的轻度富营养发展到2005年的中度富营养,磷和有机污染物是沙湖富营养化限制因子。对富营养化成因进行分析,结果表明外源污染和内源释放是造成沙湖富营养化的主要原因,黄河补水和地表径流是主要的外污染源,最后根据分析结果提出沙湖富营养化的防治对策。

The water eutrophication in Shahu Lake was evaluated comprehensively by using trophic status index in this paper. The results showed that the water eutrophication in Shahu Lake became serious gradually and it had changed from the light eutrophication in 2002 to mesotrophication in 2005. Phosphors and organic pollutants were the limiting factors to water eutrophication in Shahu Lake. The results of eutrophication analysis showed that in- ternal pollution sources and external pollution sources were the main causes for water eutrophication in Shahu Lake. Especially the water supply from Yellow River and surface runoff were the main external pollution sources. According to the analysis, some countermeasures were suggested to control the water eutrophication in Shahu Lake finally.