Nenjing Basin Is A Typical Regional Water Ecological Survey And Evaluation Index System Research

NiErJi water conservancy hub at the crossroads of Heilongjiang province and Inner Mongolia autonomous region on the Nenjiang river, the main function for flood control, power generation, industry and agriculture and urban water supply, also improve the downstream shipping conditions and improve the effect of water environment, has a unique environment characteristics and important ecological service function. Current threats to aquatic biodiversity. Aquatic biological integrity water ecosystem health evaluation index system is one of the very important indicators of, develop NiErJi ecological risk comprehensive evaluation of reservoir water environmental pollution, ecological risk index system of the building has a certain significance.Based on Nenjiang aggregate in 2014 collected samples of typical area as the research object, using the single factor evaluation method and comprehensive pollution index method, Shannon index, according to the flood and the flood season of NiErJi reservoir water quality situation, evaluate the degree of eutrophication and algae biodiversity, also in flood season from the composition, density and Margalef abundance index to evaluate the plankton and benthos. Using the above conclusion NiErJi reservoir ecological risk evaluation index system, and combined with analytic hierarchy process(ahp) to NiErJi reservoir water environmental pollution condition carries on the preliminary ecological risk comprehensive evaluation.Of NiErJi reservoir of main pollutants of water environment risk assessment, out of the water pollution risk index and risk index of two build NiErJi reservoir water ecological risk evaluation index system, the system contains five elements and 16 index layer, according to the analytic hierarchy process(ahp) to determine the index weight, according to the risk assessment standards at home and abroad to classification of NiErJi reservoir water ecological risk degree, order of the index weight and the level of single building judgment matrix sex, of NiErJi reservoir comprehensive evaluation of water environmental pollution condition. Evaluation results show that NiErJi reservoir overall risk and ecological risk mild needs to take corresponding measures to reduce risk.