为研究内蒙古自治区植被覆盖度的时空演变规律,基于2005—2018年MODIS NDVI数据,以植被覆盖度FVC为研究植被覆盖度变化的主要指标,利用时间信息熵、时间序列信息熵、植被覆盖动态变化分析等方法,分析内蒙古自治区植被覆盖度的变化强度和趋势;通过GIS空间分析方法,分析矿区、河流、降水、地形等因素对植被覆盖度的影响。结果表明:1)从时间上看,2005—2018年,内蒙古自治区植被覆盖度变化强度较平稳,变化趋势呈现缓慢增加趋势,主要原因是人们日益重视保护环境,保护植被,也得益于退耕还林政策的实施以及矿区的整治。2)从空间上看,在2005—2018年间,内蒙古地区的植被覆盖度东高西低,有明显的经度地带性。3)降水、矿区、河流都是植被覆盖度变化的影响因素,降水充沛的地区,植被覆盖度往往较高;矿区植被覆盖度低于非矿区;河流的发育为植被的生长提供良好的水分条件,距河流较近的区域植被覆盖度高;不同的地形对植被覆盖度有显著的影响,低缓坡度和海拔较低的地区相较于坡度较陡、海拔较高的地区,更适宜植被的生长。

In order to explore the temporal and spatial evolution of vegetation coverage in Inner Mongolia,based on the MOD13Q1 data from 2005 to 2018,and uses Fractional Vegetation Coverage(FVC) as the main indicator to analyze the change of vegetation coverage.Using information entropy,FVC index and other methods analyze the intensity and trend of vegetation coverage in Inner Mongolia.By using GIS spatial analysis method,the influence of river,precipitation and topography on vegetation coverage is analyzed.The results show that:(1) From the time point of view,between 2005 and 2015,the intensity of vegetation coverage in Inner Mongolia is relatively stable,and the trend of change shows a slow increase trend.(2) From the perspective of space,in 2005—2018,the degree of vegetation degradation in Inner Mongolia is high in the east and low in the west,and there is obvious longitude and zonal change that the vegetation coverage from east to west is getting lower and lower.(3) Precipitation,mining areas,rivers and topography are all influencing factors of vegetation coverage change.In areas with abundant rainfall,vegetation coverage is often high;vegetation coverage in mining areas is lower than non-mine areas;river development provides good water conditions for vegetation growth.The vegetation coverage is higher in the area near the river;the different terrain has a significant impact on the vegetation coverage.The low-gradient and low-altitude areas are more suitable for the growth of vegetation than the steeper and higher elevation areas.