宁夏主要养殖池塘水质评价

Assessment of water quality in main aquaculture ponds in Ningxia

池塘养殖是宁夏渔业生产的主要形式。2009—2011年对宁夏主要养殖池塘水质质量状况进行了监测,测定了水温、pH、亚硝酸盐、硝酸盐氮、氨氮、非离子氨(NH3)、溶氧(DO)、总磷(TP)、总氮(TN)、高锰酸盐指数和化学耗氧量(CODcr)等参数。采用单项污染指数和负荷比对监测参数进行单项评价,用综合污染指数法对水体质量进行整体评价。结果表明,3年来宁夏主要养殖池塘非离子氨的污染最为突出,其次是氮磷营养物质的污染。由综合污染指数判定,2009—2011年宁夏主要养殖池塘水体污染程度均为污染,超出警戒水平。

Pond - farming is the main form of fisheries production in Ningxia. The water quality in main aquaculture ponds in Ningxia from 2009 to 2011was monitored in this study. Eleven parameters including water temperature, pH, nitrite, ni- trate nitrogen, ammonia nitrogen, non- ionic ammonia（NH3 ）, dissolved oxygen（DO）, total phosphorus（TP）, total nitro- gen（TN）, potassium permanganate, chemical oxygen consumption（CODer） were analyzed. The parameters were assessed by single pollution index and duty ratio, and the pond water quality was assessed by comprehensive pollution index. The re- sults showed that the non -ionic ammonia is the main pollutants in Ningxiag major aquaculture ponds in three years, and the other pollutants include nitrogen and phosphorus. The water quality in main aquaculture ponds was polluted and the de- gree of contamination exceeded the alert level by the comprehensive pollution index in three years.