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对山杨林的水文水保作用进行研究的结果表明，林冠截留率年均为１５．６％；枯枝落叶的最大持水率为２５６．９％，截留率为１８．９％；枯枝落叶对径流流出时间的阻延作用与自身厚度成正比，与径流深度和坡度成反比；林地的渗透性与荒地有显著差异．其产流产沙量分别比农地减少６９．８％和８８．６％。
The results showed that the canopy retention rate of canopy forest was 15.6% annually. The maximum water holding rate of litterfall was 256.9% and the retention rate was 18.9% The decaying effect of deciduous leaves on runoff time was proportional to the thickness of runoff and inversely proportional to the depth and slope of runoff. The permeability of forestland was significantly different from that of wasteland. Its runoff and sediment yield decreased by 69.8% and 88.6% respectively compared with the farm land.