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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．
There were 12 elements in the runoff, 5 rivers and 3 lakes in the catchment areas of 27 water sources in Liuxi River. The ranges of water temperature, pH, DO, TDS, BOD5, Pb and Cd were 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. The average values of ammonia nitrogen, nitrate nitrogen, Cl- and SO42- in runoff of 17 catchments were 0.484mg · L-1 and 0.2292mg · L-1,2.792mg · L-1,2.264mg · L-1, total phosphorus was between 0.0108 ~ 0.1143mg · L-1. Adopting superposition statistics of water quality index and GB3838-88 evaluation, 84% of the test area runoff is clean and high quality water. 8.5% of the test area runoff is still clean water, and the results of runoff water quality clustering in the testing area are also consistent. The water source forest has the effect of storing and purifying water.