青海省三江源草地生态退化成因分析

采用SPSS主成分分析法,并结合实地调研,主要对三江源地区草地退化的成因进行定量分析。结果表明：自然因素和人为因素对于该研究区域草地的退化都具有作用和效力,只是作用方向不同。然而,最终导致该地区草地急剧退化的主导因素为人为因素（人口增长、牲畜超载严重、经济活动等）,尤其是超载过牧,迫使草地大面积退化、沙化、荒漠化,再加上鼠虫害等自然灾害的影响,则进一步加快草地退化的速度。

RESEARCH ABOUT ANALYSIS OF THE CAUSES OF ECOLOGICAL DEGRADATION OF THE PASTORAL AREAS IN QINGHAI-WITH THE CASE STUDY OF THE GRASSLAND DEGRADATION IN THE THREE RIVES

To analyzes the reasons for grassland degradation by the principal components of SPAA and studies.The result showed that.All the human factors and natural factors had impact on grassland in the region of study,but,The human factors are main reason for grassland degradation in all impact factors,especially the overloud of grassland,and plus the influence of the rat insect of nature disaster,for which most areas of grassland were turned into degradation and desertification more seriously.