珊溪水源地水质时空变化特征及其影响因子分析

珊溪水源地是浙江省温州市重要的水源地，运用水质标识指数法分析了珊溪水源地水质时空变化，识别了水质影响因子。结果表明：（1）2001-2010年间，珊溪水源地综合水质良好，均满足Ⅱ类水功能区要求。2003年水质最差，此后水质总体呈变好趋势。（2）入库支流水质污染主要以TN、Tp污染为主，黄坦坑断面污染最严重，其次为泗溪、珊溪和李井溪断面。（3）居民生活、畜禽养殖、种植业及单一的土地利用方式对水源地水质影响较为显著，其中畜禽养殖和居民生活是流域水质的最大影响因素。

Analysis of Spatial-temporal Distribution and its Influencing Factors of Water Quality in Shan Xi Headwater

Shanxi Headwater is one of the key fi＇eshwater sources of Wenzhou City. The water quality identification index was employed to investigate the spatial-temporal variation of water quality and the main factors affecting the quality. The results showed that the comprehensive water quality of Shanxi Headwater has attained to or been better than grade- Ⅱ during 2001 to 2010.The water quality was worst in 2003 and has generally increased since then. In spatial terms, the TN and TP pollution were main pollution. The most seriously polluted were Huangtan, Sixi,Shanxi and Lijing monitoring stations. The factors affecting quality were domestic pollution, livestock pollution, planting pollution and the single land use. The livestock pollution and domestic pollution were main factors.