With the fast increase of the population , the food demand was increased . it resulted in the cultivation of much rangeland , which led to the meadow desertification because of overload in grassland . and after population increases , for keeping their live hood people who raise domestic animals increase their livestock , which is not only the cause of the desertification , but also the general mode of desertification developing 由于人口的增加,加大了粮食的需求,从而不断的以草地为代价来扩大耕地面,草场面积的减少,单位牲畜占有草场的量不断下降,就会导致超载,引发草原退化、沙化,人口的增加也会刺激对肉类的需求,为了满足种种需求,牲畜的数量不断增加,最终导致土地沙化。
From tang dynasty to ming and qing periods , the desertification of the land turned to stronger and stronger , and there were different expand modes toward the southeast in different districts , such as spreads with sheet sand , expands with sand tongues , spreads along the river valley and expands with the wide zonal sand tongue 唐代以至明清时期，长城沿线毛乌素沙地土地沙化有愈演愈烈之势，并在不同地段，分别以片沙蔓延、沙舌扩展、河谷沙化及宽带沙舌等形式向东南方向扩展。
The classified result show that the grass land of this region retrogressed badly in 2000 : the appreciable retrogression proportion of the grass land is 15 % , the moderate retrogression proportion is 15 % ; the serious retrogression proportion is 8 % ; the area of desert is 2755 . 27km2 and the proportion is 19 % , which had increased about 88 . 9 % in eight years 植被覆盖度分类结果显示， 2000年该地区草地退化比较严重： 21草地轻度退化， 15的草地中度退化， 8的草地重度退化，土地沙化面积为2755 . 27km ~ 2 ，比1992年增加了88 . 9 。
The field of taiyangmiao nuresry of trees and grass is an important ecology protecting area in inner monogolia . all of projects in the field , including the water and soil conservation trees , the windbreat of returning farmland to treeland and grassland , are playing a very important role in preventing and decreasing vegetation deterioration , land desertification and sandstorm weather 星月太阳庙林木种苗培育基地和农业种植基地是内蒙古重要的生态功能保护区，基地内的水土保持林、防风固沙林、速生丰产林、退耕还林还草等林草工程，对防止植被退化、土地沙化、减缓沙尘天气的发生起到不可忽视的作用。
Due to the influence of climate drought and human activities , the ecological environment of qinghai province is in an increasingly grave condition , namely , climate abnormal events occurring frequently , grassland degenerating , ground sanding , glacier shrinking , water level of lakes descending and river runoff decreasing , and so on . in the basis of extensively collecting and analyzing the data of qinghai ecological environmental factors such as climate , water resource and grassland resource etc . , the further basic research is performed on the ecological environment characters of main climate factors , surface runoff , water resource , lcc and their correlation to coordinate with the basic , strategic and precursory research for the development of china west part and provide the scientific foundation for corresponding development both ecological environment and social economy , and persistent utilization of natural environment resource 本研究针对当前在气候干旱化和人类活动的共同影响下青海省生态环境中气候异常事件即气象灾害频繁发生、草场退化、土地沙化、冰川萎缩、湖泊水位下降和河流流量减少等生态环境退化现象日益严重的实际，在广泛收集和整理青海省气候、水资源、草地资源等生态环境因子基础资料的基础上，对青海的主要气候要素、地表径流、水资源、植被的演替及其相互间的关系等主要生态环境变化特征进行了基础性的研究。
