退耕还林还草工程对中国北方农牧交错区土地利用/覆被变化的影响--以科尔沁左翼后旗为例

The Impact of the Grain for Green Project on the Land Use/Cover Change in the Northern Farming-pastoral Ecotone, China —A Case Study of Kezuohouqi County

以北方农牧交错区-科尔沁左翼后旗为例,利用卫星遥感技术获取1980~2010年土地利用/覆被信息,通过统计模型重建土地利用/覆被及景观格局变化过程,综合评价二者动态及退耕还林还草等生态恢复工程的影响。研究区土地整体处于准平衡态势,各地类双向转换较频繁;耕地与草地的变化对区域土地利用/覆被及景观格局变化起支配作用;退耕还林还草等生态恢复工程逆转了天然植被（包括草地与林地）整体减少及耕地与未利用地增加的局面,使各景观破碎化程度有所缓解,这可能有利于生态环境的改善。

Based on remote sensing techniques,the land use/cover information between 1980 and 2010 was obtained and the change processes of land use/cover and landscape pattern of Kezuohouqi County in the loess plateau,China were characterized,using the statistical models to analyze the impacts of the Grain for Green Project（GGP） on both of them.The land was generally in quasi-balanced status with a slight difference between the loss and the gain of the area for most land use types,indicating that the land conversion direction was dominated by two-way transition.Transition between cropland and grassland dominated the processes of the land use/cover change and landscape pattern dynamics.The GGP together with other eco-restoration projects reversed the decline trend of natural vegetation（i.e.,the woodland and grassland） and the increase trend of cropland and unused land,and reduced the fragmentation of landscape.These changes may be beneficial to the local eco-restoration.