自然因素对祁连山水源涵养能力影响研究

目的]分析不同自然因素对祁连山区水源涵养能力的影响。方法]利用祁连山区2003年水源涵养量、高程数据(DEM)和SPOT-VEGETATION遥感数据,采用统计学方法定量分析研究区内差异较大的高程、坡度、坡向及植被条件与水源涵养量的关系,并提出水源涵养强度的概念,研究祁连山区自然因素对水源涵养量的影响。结果]在祁连山山地水源涵养区内,高程为3 600～4 200 m或坡度为15～40°的区域水源涵养量较大;水源涵养能力最强的区域主要集中在阳坡(90～180°)或植被覆盖程度较高的区域。结论]该研究为祁连山区的水资源管理和植被保护提供了科学依据。

Study on the Effects of Natural Factors on Water Conservation Capacity of Qilian Mountain

Objective] The study aimed at analyzing the effects of natural factors on water conservation capacity of Qilian Mountain.Method] Based on water conservation quantity,digital elevation model(DEM) and SPOT-VEGETATION remote sensing data of Qilian Mountain in 2003,the relationship of water conservation quantity with elevation,slope,aspect and vegetation conditions varying greatly in the studied area was analyzed quantitatively by means of statistical method,and the effects of natural factors on water conservation capacity of Qilian Mountain were discussed on the basis of water conservation intensity.Result] In water conservation district of Qilian Mountain,water conservation amount was higher in the region with elevation of 3 600-4 200 m or slope of 15-40°;sunny slope(with slope of 90-180°) and the area with high vegetation coverage had the strongest water conservation capacity.Conclusion] The research could provide scientific references for the management of water resources and vegetation protection in Qilian Mountain.