内蒙古林草过渡区植被覆盖度时空变化及其驱动力研究—以呼伦贝尔市和兴安盟扎赉特旗为例

以呼伦贝尔市、兴安盟扎赉特旗作为研究区，基于MODIS NDVI数据，利用像元二分模型反演得到研究区2001—2016年植被覆盖度数据，研究其草原退化整体变化趋势及影响因子。研究结果表明：极低覆盖和低覆盖植被面积不断增长扩大，年均增长分别率为12.29%和3.13%；中覆盖从面积由增长转为面积减小，年均增长率为-4.63%；高覆盖和极高覆盖植被面积一直在减小，年均增长率分别为-5.99%和-4.8%；坡度≤5°的地区退化率较高。气象、海拔和坡向因子宏观上决定植被的分类和密集程度，但由于研究区人地关系复杂，草原退化主要以人口密度和牲畜密度较为集中的地区为主。

Spatial and Temporal Variation and Driving Force of Vegetation Coverage in Forest-grass Transition Area of Inner Mongolia: A Case Study of Hulunbuir City and Jalaid Banner of Hinggan League,

The stady is Jalaid Banner，Hinggan League and Hulun Buir city as study area, bases on the MODIS NDVI data and uses the dimidiate pixel model data of research area 2001 to 2016 by inverting,then , studies the whole trend of change and influencing factors.The results show that extremely low coverage and low coverage vegetation area is growing With an average annual growth rate of 12.29% and 3.13%, the middle coverage is from the area of growth to reduce with an average annual growth rate of -4.63% ,and the high coverage and high coverage of vegetation area have been reduced with an average annual growth rate of -5.99% and -4.8%.The degradation rate is high where the slope of terrain factor ≤5°.In general,meteorology, elevation and Slope direction factors determine the classification and intensity of vegetation,but relationship between man and land is complex in the study area,then grassland degradation is mainly concentrated in areas where population density and livestock density are concentrated.