近38年科尔沁沙地NDVI时空演化

Temporal and spatial evolution of NDVI in Horqin Sandy Land in recent 38 years

为揭示中国东北典型沙地植被时空动态特征和定量识别相关驱动因子及其影响力,基于1982—2020年AVHRR GIMMS NDVI和MODIS NDVI数据集,利用GIS空间分析及数理统计等方法,研究了科尔沁沙地近38年NDVI时空变化特征及其驱动因素.结果表明:近38年科尔沁沙地NDVI呈增加趋势,增幅为32.78%;NDVI增加区域多位于农田分布区,其增幅较小,且具有空间差异性,沙地整体呈现由荒漠化向绿洲化方向发展.科尔沁沙地植被覆盖增加受控于区域气候变化的影响,其中年均降水量是主控因素.

In order to reveal the spatio-temporal dynamic characteristics of vegetation in Horqin Sandy Land and quantitatively identify the relevant driving factors and their influence,based on the AVHRR GIMMS NDVI and MODIS NDVI data sets from 1982 to 2020,the spatio-temporal variation characteristics of NDVI and its driving factors in the past 38 years in this area were studied by using GIS spatial analysis and mathematical statistics.The results showed that:NDVI in Horqin Sandy Land increased by 32.78%in recent 38 years.The increasing area of NDVI is mostly located in the farmland distribution area,which has a small increase and spatial difference.The overall development of the sandy land is from desertification to oasis.The increase of vegetation cover in Horqin Sandy Land is controlled by regional climate change,and the annual precipitation is the main factor.