利用遥感技术监测锡林郭勒天然草原利用强度方法初探

利用多时相的遥感数据，对2005年锡林郭勒天然草原生长期放牧利用强度进行了信息提取、监测和制图。结果表明：在牧草生长季节，天然草原各旬度的利用强度与植被指数旬度变动系数成反比，并与降雨和植被长势时空分布格局相一致；放牧初期旬度变动系数下降4％左右，利用强度较轻，处于轻度过牧状态；6月中旬以后，旬度变动系数下降12％～20％之间，利用强度加重，处于中度超载过牧状态；8月下旬后植物生长停止，旬度变动系数下降27％左右，利用强度最重，处于重度超载过牧状态。遥感监测结果经过地面同步采集数据验证，监测精度达到79．6％。

The Study of Method about Monitoring Grazing Intensity in Xilingol Rangeland Using RS Data

The grazing intensity in Xilingol rangeland was monitored in 2005 basing on RS technology and data. Result showed that the dynamic change of the grazing intensity is inverse ratio to Coefficient of Variation of per--decad, and is accordant to temporal and spatial distribution of rainfall and vegetation growth during growth period of rangeland vegetation, The research also showed that rangeland was in state of light during growth period of rangeland vegetation, The research also showed that rangeland was in state of light use during primary period of growth, and Coefficient of Variation dropped by 4%; rangeland was in state of middle use during middle period of growth, and grazing intensity was heavier, and Coefficient of Variation dropped by 12-20%; rangeland was in state of heavy use during end period of growth, and grazing intensity was the most heaviest, and Coefficient of Variation dropped by 27 %. The result has been tested that the precision is about 79.6%.