【摘要】 以内蒙古锡林河流域中游为研究区,应用LandsatTM资料,结合地面生物量定位测定,建立草原地上生物量估产模型,应用VisualC++编程,估算了2000年7月中下旬锡林河流域中部草原地上生物量。在锡林河流域中部两大草原植被类型[羊草+大针茅和(大针茅)克氏针茅+冰草]不同生物量的基础上,以象元为诊断单元,判别了各象元所代表地块草原植被的退化等级,绘制锡林河流域中部草原植被退化分布图。1999年锡林河以东草原退化面积为2697.3km2,占中游草原面积的49.7%,以西退化面积为1644.4km2,占30.3%。以草原生态系统可持续性为目标,针对不同退化等级草场制定不同的牧草产量利用率,划分6个放牧强度等级,计算各放牧等级的合理放牧强度(标准羊单位/km2)、面积和载畜量,研究结果可为草原退化的恢复、畜牧业的可持续发展提供决策支持。更多还原

【Abstract】 Using Landsat TM CCT, selecting the middle reach of Xilin River Basin as study area, we established model of steppe aboveground biomass estimation, and estimated aboveground biomass of steppe in the study area in middle July, 2000. Based on the scope of aboveground biomass of two main types of steppe vegetation undegraded and degraded, we assessed steppe vegetation degradation rank with the unit of pixel, and compiled steppe degradation distribution map of the middle reach of Xilin River Basin. In 2000, the area of degraded steppe in the east part of Xilin River was 2 697.3 km2, 49.7% of the whole steppe area, the area of degraded steppe in the west part was 1 644.4 km2, 30.3% of the whole steppe area. Considering steppe ecosystem sustainability as final goal, We determined different forage grass utility rate to the different degradation ranks, divided six grazing intensity ranks, calculated reasonable grazing intensity, area and grazing capacity. The result can provide decisionmaking support for the restoration of degraded steppe and animal husbandry sustainable development at the regional level.更多还原