<正>通过对天山北坡山地森林对河流枯水径流量补给功能分析的研究结果表明 ,随着山地河流集水区内林率以及单位面积森林蓄积量的增加 ,河川枯水期径流量增加 3.5× 1 0 8m3,河川径流枯水期缩短 2个月 ,最枯月径流量增加约 0 .7× 1 0 8m3;林率每增加 1 %,河流最枯月径流量增加 40 0× 1 0 4 m3;森林蓄积量每增加 1 0 0 0m3,河流最枯月径流量增加 2 70 0× 1 0 4 m3。

The amount of fluvial runoff and the length of low runoff period lays very importance influence upon the production of industry and agriculture and the social life of the people in the arid desert area in Xinjiang Uygur Autnomous Region. The comprehensive study on the relationship between the forest coverage and unit stock volume and the amount of fluvial runoff of rivers in the dry period indicated that the increment of forest coverage in the mountainous areas could increase the amount of fluvial runoff of large rivers in the dry seasons and shorten the low runoff period. As to the rivers on north slope of the Tianshan Mountains, the low runoff period was shortened by 2 month because of increment of the forest coverage in the catchment areas, the monthly average amount of fluvial runoff during the dry seasons was increased by 3.5×10 8?m 3 and the fluvial runoff in the driest month was increased by 0.7×10 8?m 3.When the ratio of forest coverage was increased by one percent, the fluvial runoff in the driest month was increased by 400×10 4?m 3.When the forest unit stock volume was increased by 1?000?m 3, the fluvial runoff in the driest month was increased by 2?700×10 4?m 3.