重庆市渝西地区水库富营养化调查及评价

EUTROPHICATION INVESTIGATION AND ASSESSMENT OF RESERVOIRS IN WESTERN CHONGQING

对重庆市渝西地区14座大中型水库监测结果表明,所有水库水体中总氮、总磷含量高,均已经达到产生富营养化条件的水平。14座水库TP含量范围为0.022～0.598mg/L;TN含量范围为0.520～2.49mg/L;CODMn含量范围为2.60～9.30mg/L;透明度范围为0.65～1.95m;Chla范围为1.59～39.3mg/m3。利用中国环境监测总站推荐使用的评价标准,对监测结果进行了富营养化评价。评价结果表明,重度富营养化水库3座、中度富营养化水库6座、轻度富营养化水库3座、中营养水库2座。渝西地区大中型水库的富营养化,严重影响当地居民的饮用水质量。

An investigation of the trophic state 14 large- and medium-sized reservoirs in western Chongqing carried out in 2003 revealed that total N and total P in these reservoirs were high enough for eutrophication to occur. Total P (TP), total N (TN), COD_(Mn) and Secchi disk depth (SD) varied from 0.002 to 0.598 mg/L, from 0.520 to 2.49 mg/L, from 2.60 to 9.30 mg/L and from 0.65 to 1.95 m, respectively. Chlorophyll a was in the range from 1.59 to 39.3 mg/m^3. Evaluated with the method recommended by Environmental Monitoring Centre of China, 3 of the 14 reservoirs investigated were hyper eutrophers, 6 were medium eutrophers, 3 were light eutrophers and 2 were mesotrophers. The eutrophication of the reservoirs in western Chongqing seriously affects the quality of the drinking water of the local residents.