对乌兰布和沙漠北缘内蒙古农业大学教学实习基地 5年的植被数量变化分析 ,结果表明 :天然植物群落虽然没有发生演替 ,但其波动的趋势是向着逆行方向进行的。其原因主要在于该地区人口增加之后开垦土地面积的增加和牲畜数量增加带来的放牧强度加大。该地是一个生态脆弱区 ,此区要进行农牧业生产 ,必须考虑生态阈值。必须此区域要进入可持续发展必须走科技的道路 ,必须有政策扶持 The change of vegetation quantity in teaching practice base of Inner Mongolia Agricultural University in the northern edge of Ulan Buh Desert was analyzed. The results showed that although the natural plant community did not have succession, the trend of fluctuation was toward the retrograde direction. The main reason for this is the increase in the area of ​​reclaimed land and the intensification of grazing due to the increase in the number of livestock after the increase in population in the area. The area is an ecologically fragile area. In this area, ecological thresholds must be taken into account for the production of agriculture and animal husbandry. It is imperative that there be policy support for this region to enter the path of science and technology necessary for sustainable development