【摘要】 本文在总结三江源草地退化的基础上,综合分析了草地退化的原因。结果表明:该地区90%以上的草地出现了不同程度的退化。其中,中度以上的退化草地为1247.83×104hm2,约占该区草地可利用面积的60%以上,退化草地类型主要分为黑土滩型退化草地、沙化型退化草地和毒杂草型退化草地。在导致草地退化的因素中,人为因素占主导地位,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,进一步加快了草地"三化"的速度。更多还原

【Abstract】 Based on the summary of the grassland degradation status,and analyzed the reasons for grassland degradation.The results showed that about 90% of the total rangeland area is degraded to different extent,and of which,above medium degree of grassland degradation are 1247.83×104ha,accounting for 60% of the utilizable grassland,the types of degrading grassland can be divided into Blank Soil Type,Desertification Type and Poisonous Miscellaneous Grass Type.The human factors are main reason for grassland degradation in all impact factor,especially the overload 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.更多还原