南水北调中线水源区水体营养状态评价

Water Trophic State of the Water Resource Area of the Mid-Line Project of South to North Water Division

为了给南水北调中线水源区长期生态研究数据信息库的建立及生态工程规划提供科学依据,在丹江口水库水域设立5个监测站,于2012对南水北调中线水源区叶绿素a和水质理化指标进行监测,并采用营养状态指数法和单因子评价法对中线水源区进行营养状态评价。结果表明,2012年南水北调中线水源区叶绿素a质量浓度为0.003 mg/L,营养状态指数TSI(Chla)为41.35;丰水期营养状态指数最高(EI为45.3),枯水期和平水期相近;单项指标中总氮超标,已达中富营养状态。综合评价表明,2012年南水北调中线水源区处于中营养状态,符合南水北调调水水质的要求。

Chla content and physicochemical indexes were monitored at five stations to establish the science foundation of the databank of the long-term ecological research and layout of ecological project of the water resource area of the mid-line project of south to north water diversion in 2012.Water samples were collected using standard methods.Trophic status index and sole factor method were used to evaluate the trophic status of the water resource area.Chla concentration was 0.003 mg / L and nutrition status index TSI（Chla） was 41.35.Trophic status index（EI） of wet period was the highest among three water periods.The physicochemical indexes except total nitrogen are under the standard of Ⅰ type water.All results showed that water trophic state of this water area could be regarded as mesotrophy,and Danjiang reservoir is suitable for water resource area.