沙湖水体富营养化限制性因子分析

为确定沙湖水体富营养化发展的主要限制因子,根据沙湖2002—2004年水质监测资料,运用回归统计方法,选择氮、磷等8项理化因素与藻类叶绿素a进行回归分析.结果表明:水温、总磷、透明度与藻类叶绿素a呈显著线性关系,其中总磷和水温是沙湖富营养化的限制因子.对富营养化成因进行分析表明,外源污染和内源释放是造成沙湖富营养化的主要原因,且黄河水补给和地表径流是主要的外污染源.提出了沙湖富营养化的防治对策,为沙湖综合治理方案提供科学依据.

Analysis of limiting factor to eutrophication and its countermeasures in Shahu Lake

To determine the main limiting factor about development of water eutrophication in Shahu Lake,this paper dealt with the relation between algal chlorophyll-a(Chla) and eight environmental factors such as total phosphors(Tp),total nitrogen(TN),water temperature(T),pH,secci-depth(SD) based on the monitoring data in Shahu Lake from 2002 to 2004.The regression statistical method was used to calculate the relation between algal chlorophyll-a and these environmental factors.The results showed that water temperature,Tp and SD were the most significant related factors to algal chlorophyll-a,and water temperature and TP were the limiting factors to eutrophication in Shahu Lake.The results of eutrophication analysis show that internal pollution sources and external pollution sources are the main causes for water eutrophication in Shahu Lake.Especially the water supply from Yellow River and surface runoff are the main external pollution sources.According to the analysis,some countermeasures were given to control the water eutrophication in Shahu Lake finally.