若尔盖湿地国家级自然保护区水质评价

Water Quality Assessment of National Nature Reserve in Ruoergai Wetland, Sichuan, China

用单因子评价指数法对若尔盖湿地国家级自然保护区的水质状况进行了分析和评价,以期为该区域湿地生态系统的恢复与保护提供科学依据。结果表明,80%以上的检测项目达到地面水国家Ⅰ类水质标准,部分项目超标但尚未对保护区生物构成严重威胁。受湿地自然因素的影响,保护区水体的pH值和Fe2+浓度较高;自然因素和人为因素的共同作用导致保护区水体的CODCr、NH3 N和油等项目超标,湖泊呈富营养化趋势,水体的有机污染较严重。建议采取相应的调控措施如减少人畜生活污水排放并加强其治理、疏通湖泊出入水口以促进水体更新。

Water quality analysis and assessment of national nature reserve in Ruoergai wetland were studied using the method of single-factor assessment index to provide scientific guide for the restoration and protection of wetland ecosystem in the area.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 danger to the organism in the natural reserve although that of several (items) exceeded the standard value slightly.The concentration of Fe^(2+) and pH value were higher for the natural factor, the value of COD_(Cr)、NH_3-N and oil exceeded the standard value, ultrophication and organic pollution of the lake water were serious because of the interaction of natural and anthropogenic factor.Some countermeasures for the restoration and protection of wetland ecosystem were put forward.These include decreasing the drain amount of life sewage and dispose sewage water and dredging the inlet and outlet of lake for water turnover cycle in the area.