流溪河水源林流域径流水化学含量及评价

对流溪河２７个水源林汇水区地下径流、５个河段、３个湖水中１２项元素检测，各检测区的水温、ｐＨ、ＤＯ、ＴＤＳ、ＢＯＤ５、Ｐｂ、Ｃｄ范围分别为１９．０～２２．５℃，６．３６～７．６５，８２％～９４％，７．６５～９５．６ｍｇ·Ｌ－１，０．２０～３．３０ｍｇ·Ｌ－１，０．０４～＜０．０００１ｍｇ·Ｌ－１，≤０．０００１ｍｇ·Ｌ－１；其中１７个集水区径流的氨氮、硝态氮、Ｃｌ－、ＳＯ４２－均值分别为０．４８４ｍｇ·Ｌ－１，０．２９２ｍｇ·Ｌ－１，２．７９２ｍｇ·Ｌ－１，２．２６４ｍｇ·Ｌ－１，总磷在０．０１０８～０．１１４３ｍｇ·Ｌ－１之间．采用水质指标叠加统计及ＧＢ３８３８－８８评价，８４％的检测区径流为清洁优质水．８．５％的检测区径流为尚清洁水，检测区径流水质聚类结果也相吻合，水源林具有贮滤净化水质效应．

Study on the Hydrochemistry and Appraising of Runoff in the Forest Watershed of Liuxihe

The measured data in 35 forest watersheds with 12 indexes of water quality were analyzed by means of the average index. The results show that there is high quality water in the forest watershed. The water quality index of the 30 investigated watersheds achieved the first standard (water quality index P≤0.2). Contrasting with the rainfall, the forest ecosystem has purifying function on the NH4+-N, Cl- and P in precipitation. At same time, the similar analysis has identical views with the appraising of the average index of water quality. The water quality of Liuxihe forest watershed is good. The research has provided basic reference material for the regional water environment.