伏牛山南坡生态变化对降水的影响

利用1958～2000年有代表性的周边县树木增减资料、1984年10月～1986年9月树冠对降水的截流观测资料及1950～1999年西峡县山洪资料，分析了伏牛山南坡森林覆盖率对降水的影响，结果表明：森林覆盖率高的地区，平均年雨量值大；林区树冠和植被对降水的截流率在60％以上，植被越好，树林郁闭越大，山地的山洪和水土流失就越小，不但可减轻洪水灾害，而且蓄水于地下，以丰补欠，调节林区水分供应；西峡县因森林覆盖率的降低，山洪次数增加。因此，应治山造林，绿化荒山。

The Influence of Ecological Changes on Precipitation on Funiu Mountain's Southern slope

The paper concerns the influence of forest coverage rate on precipitation on Funiu Mountain's southern slope in terms of the changing plant number during 1958-2000, crown interception data from October 1984 to September 1986 in the neighbor counties and the data of mountain flood occurred from 1950 to 1999. Results show that the higher the rate of coverage, the more the rainfall; With the coefficient of interception higher than 60%, the more the vegetation, the more the canopy density, and the less the floods occur; In Xixia the flood increases with the low rate of coverage. As a consequence, we should make the mountain slopes covered with trees.