【摘要】 利用1980年以来的遥感数据、气象数据和牲畜头数数据,采用图形代数和统计分析方法,对比研究了锡林郭勒和呼伦贝尔两大草原退化状况及其驱动因素。研究结果表明,锡林郭勒草原目前已经发生了整体性的全面退化,中重度退化草原面积超过40%,呼伦贝尔草原退化面积为54.36%,以轻度退化类型为主;草原退化主要受气候旱化和放牧活动的影响,草原植被覆盖度的降低与降雨量减少及干旱程度提高之间存在高度一致的对应关系;而锡林郭勒草原退化程度显著高于呼伦贝尔草原,这与其自上世纪80年代以来一直处于高强度放牧利用密切相关。更多还原

【Abstract】 Combining remote sensing data,meteorological data and livestock statistical data since1980,the map algebra and statistical analysis were used to understand steppe degradation and its driving factors in the Xilin Gol Grassland and Hulun Buir Grassland. The research results show that,nearly whole area of Xilin Gol Grassland has degradated,and the moderate and severe degradation area is more than 40%. The degradation area in Hulun Buir grassland is 54.36%,mainly in the mild degradation. Grassland degradation is generally affected by drought and overgrazing. The vegetation coverage lost has positive related to reduced precipitation and drought. Because of heavy grazing since 1980 s,the degree of degradation of Xilin Gol Grassland was severe than that in Hulun Buir Grassland significantly.更多还原