山杨林的水文水保作用研究

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％。

Study on Hydrology and Soil Conservation Effects of Mountain Poplar Forests

In this paper.the hydrology and soil conservation effect of mountuinous poplar forest is studied. The resultS show that the annual rate of detention of forest crown is 15.6% in average of detention.The maximum rate of holding water and rate of detention of dry branches and leaves are 256. 9% and 18. 9% respectively, the retarding effects of dry blanches and leaves on run off time are in direct propotation to their thickness,and in inverse proportion to run off depth and slope. The infiltration capacity of forest is notably Different from uncultivated land. The rate of water and sediment yield reduces by 69. 8%and 88. 6%respectively comaaed with thst in the cropland.