重庆市主城区备用水源富营养化评价

Evaluation of Eutrophic States of Spare Drinking Water Resources in Chongqing City

对重庆市主城区的12个备用水源（水库）进行水质调查，采用综合营养状态指数法对营养指标进行富营养化评价。结果表明：2006年10月调查水库CODMn浓度范围为1．79～8．13mg／L，TN浓度范围为0．783～4．12mg／L，TP范围为0．013～0．067mg／L；2007年1月CODMn浓度范围0．83～7．08mg／L，TN浓度范围为1．36～3．37mg／L，TP范围为0．012-0．094mg／L。备用水源中TN含量较高，均已达到富营养化水平；TP含量则较低。由于N、P比值影响，水体中藻类的生长受到P的抑制作用。2007年1月水库富营养化情况比2006年10月好，只有已建成的2座水库达到轻度富营养化；而2006年10月8座水库达到富营养化水平，其中2座已建成水库为中度富营养化，其余6座为轻度富营养化。已建成的水库富营养化程度比拟建水库富营养化程度严重。

It was studied that the water quality of 12 Spare Drinking Water Resources in Chongqing City, and the eutrophic state of these resources by using the comprehensive nutritive index. The results showed that the values of CODMn, TN, TP of the drinking water resources on October, 2006 were 1. 79-8. 13 mg/L, 0.783-4.12 mg/L, 0. 013-0. 067 mg/L respectively, and the values of CODMn, TN, TP on January, 2007 were 0.83-7.08 mg/L, 1.36-3.37 mg/L, 0. 012-0. 094 mg/L respectively. The concentrations of TN in these spare resources were up to eutrophic level, the concentrations of TP were low. The growth of alga been restrained by P owing to N/P. The Eutrophic States of reservoir on October, 2006 were more serious than on January, 2007. Two established reservoirs belong to the slight eutrophic level on January, 2007. Eight reservoirs belong to the slight eutrophic level on October, 2006, two established reservoirs belong to the middle eutrophic level,the other reservoirs belong to the slight eutrophic level. The result also indicated that the eutrophic level of 6 builded reservoirs were more serious than building reservoirs.