太湖金墅湾水源保护区陆域水质特征

Characteristics of Water Quality in the Land of Taihu Lake Jinshu Bay Water Source Protection

水源保护区陆域良好的水质是供水安全的重要保证。为探讨太湖地区水源保护区陆域水质现状及陆域污染对水源地取水口水质的影响,以太湖金墅湾水源保护区为研究对象,对陆域河流、入湖河口及邻近湖区进行了系统的调查。结果表明:陆域水质氮含量超过国家Ⅳ类水标准,污染程度高于湖区,其中以硝态氮为主的农业非点源污染对水源地水质构成较大威胁;磷含量维持在Ⅲ类水质,污染程度较小。保护区河流污染受季节性变化影响显著,且存在明显的空间差异。

Good quality of water in the land of water source protection areas is a guarantee for the security of water supply. In order to investigate the situation of water quality in the land areas of Taihu water source protection and the effects of their pollution on water quality in water intake of the protection areas, the Jinshu bay, a water source protection area of Taihu, was selected and water quality in land rivers, lake estuary and adjacent lake areas were investigated. The results showed that concentration of nitro- gen in the land area exceeds the IV water quality standard for drinking water, with the pollution being greater than that in adjacent lake area. The pollution of NO3^- - N is especially serious, which should be produced from agricultural non - point source. Coneentration of phosphorus generally reaches the m water quality standard for drinking water and thus has less pollution to the water intake. Seasonal changes and spatial variation are evident for these water quality indexes.