Influence factor analysis and assessment of water quality in national nature reserve in Ruoergai Wetland, Sichuan, China

Water quality analysis and assessment of national nature reserve in Ruoergai wetland were studied using a method of single-factor assessment index to provide scientific guide for the protection of water quality in Ruoergai Nature Reserve. The results indicated that the determining values of more than 80% of analysis item reached the quality assessment standard of the first-class surface water, there was no dangers to the organism of the reserve although that of a little of items exceeded standard value. The concentration of Fe2+ and pH value were higher for the natural factor, the value of CODCr, NH3-N and oil exceeded standard value, eutrophication and organic pollution of the lake water were serious because of the interaction of natural and anthropogenic factor. Some countermeasures for protection of water quality were put forward such as (a) to decrease the drain amount of life sewage and dispose sewage water; (b) to dredge the inlet and outlet of lake for water turnover cycle in Ruoergai National Nature Reserve.