马别河流域石漠化影响因素分析

影响岩溶地区石漠化发生发展的因素有自然因素与人为因素两种。以贵州省马别河流域石漠化现状的遥感调查数据为基础,叠加该流域的坡度图进行空间分析,揭示了岩溶地区石漠化的发生率与发育程度随坡度而变化的规律,指出坡度是石漠化发生的重要驱动力,随着坡度的变陡石漠化发生率与发育程度都显著增加。结合前人的研究成果,提出石漠化的发生以自然因素影响为主,人类活动起到了促进的作用。25°坡度带是人类活动与自然因素影响作用的转换带,坡度>25°时,自然因素对石漠化的发生起主导作用。根据地形变化合理地限制人类活动,能有效地减少石漠化带来的危害。

Affecting Factors of Rock Desertification in Mabie River Basin

There are two factors of natural factor and manmade factor to affect the happening and development of rock desertification. Shedding light on the laws of happening ratio and development degree of rock desertification in karst region changing along with the slope, the paper points out that slope is the main driving force for causing rock desertification and the happening ratio and development degree will be remarkably increased along with the increase of slope based on remote sensing datas of current situation of Mabie River basin in Guizhou Province. Combining with the previous research results, it puts forward that the happening of rock desertification is mainly affected by natural factor and human activities serve to spur the progress of events. 25°slope belt is the conversion belt of effect action of human activities and natural factor. When the slope>25°,the natural factor plays the leading function for causing rock desertification. Reasonable restriction on human activities according to the changes of topography can effectively reduce the damage caused by rock desertification.