Abstract: According to the EOS/MODIS satellite images,ground sites data,and climatic information,the returning green status of Xilingol Grassland was monitored form 2003 to 2007.The results show that 88.85% grassland in 2007 was in normal greening or well greening with average yield of 574.5 kg·hm^-1 and average coverage of 35%.To compare with last year,the forage yield in 2007 increased 1.5 times and vegetative coverage increased twice.To compare with last five years,the grassland was growing well in 2007.In recent years,Xilingol grassland recovered gradually,forage growth and yield showed consistent dynamics with precipitation and quantity of heat,that could be attributed to implementation of grassland protection by rest-grazing,grazing forbidden,and realization of grass-livestock balance system.

Key words: Grassland, Returning green status, Growing dynamics, MODIS Vegetation Index, Rest-grazing

摘要： 为全面掌握草原生产力动态变化,应用EOS/MODIS卫星数据结合地面样方和气候资料,对锡林郭勒草原2003-2007年返青状况进行动态监测。结果表明:2007年返青正常与较好的草原占88.85%,全盟平均每hm²鲜草产量达574.5kg,平均盖度35%,比2006年同期产草量增加1.5倍,盖度增加2倍;与近5年同期相比,2007年春季草原长势很好,近年全盟草原已向恢复趋势发展,历年植被长势和产草量的波动与降水量、热量的动态变化格局基本一致,可能与近年来大面积实施休牧、禁牧等草原保护措施,及大力推行草畜平衡制度有关。

关键词: 草原, 返青动态, 长势动态, MODIS植被指数, 休牧