<正>运用天山北坡山地 31条河流的水文、气象以及森林资源资料 ,分析森林调节河川年径流量作用 ,结果表明 :森林与蒸发因素具有减少河川年径流量的效应 ,且森林调节河川径流量的作用远大于蒸发因素影响。在森林因素中 ,森林面积增加对河川年径流量的影响程度大于单位集水区面积森林蓄积量增加的作用。在天山北坡山地自然地理环境条件下 ,林率每增加1 %,河川径流量平均减少 0 .33mm ;单位集水区面积森林蓄积量每增加 1 %,河川径流量平均减少 0 .2 7mm。

The functions of forest regulating fluvial runoff on north slopes of the Tianshan Mountains were analyzed by using 31 basins of hydrological, weather and forest data and so on. The results were as follows: forest and evaporation could reduce the functions of annual runoff discharges and the regulating function of fluvial runoff by forest was far more than that of evaporation. Among the forest factors, the effects of increasing forest coverage was larger than the unit stock volume increased on fluvial annual runoff. Under the natural environment on north slopes of the Tianshan Mountains.When the forest corerage was increased by 1?%,the fluvial annual runoff was decreased 0.33?mm on average. When the unit stock volume was increased by 1?%.the fluvial annual runoff was decreased 0.27?mm on average.