榆林地区2000—2014年NDVI时空变化  

The spatiotemporal change of NDVI in Yulin,Shaanxi Province,China from 2000 to 2014

作　　者：石玉琼[1,2] 郑亚云[2] 李团胜[2] 

机构地区：[1]山西农业大学林学院,山西太谷030801 [2]长安大学地球科学与资源学院,西安710054

出　　处：《生态学杂志》2018年第1期211-218,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金(31140042);陕西省软科学计划项目(2007RK21);陕西省自然科学基础研究计划项目(2009JM5004);山西农业大学科技创新基金(2014008)资助

摘　　要：为了评价退耕还林的实施效果以及榆林地区生态环境变化,利用MODIS NDVI数据,采用最大值合成法,基于GIS平台,研究榆林地区2000—2014年植被覆盖的时空变化。结果表明:2000—2014年,榆林黄土丘陵沟壑地区NDVI高于风沙滩地区,前者植被覆盖好于后者;15年来,榆林植被覆盖状况总体得到改善,改善面积占90.7%,退化面积仅占1.0%,未变化面积占8.3%。黄土丘陵沟壑区植被改善面积达94.2%,以中度改善为主;坡地植被改善面积达80%以上,7°~35°坡度上植被明显改善的面积达51%以上,退耕还林还草取得了明显的效果。In order to evaluate the implementation effect of the Grain for Green Project （ conver- sion of degraded farmland into forest or grass Land） and the eco-environment variation of Yulin, MODIS NDVI data was used to examine the spatial and temporal change of vegetation cover by applying maximum value composite （MVC） method based on the GIS. NDVI was higher in hilly loess region than that in blown sand region from 2000 to 2014. In general, the vegetation had im- proved during the past 15 years. In whole Yulin, the area of the improved vegetation accounted for 90.7%, the area of degradation constituted only 1.0%, and the area of no variation was 8.3%. In hilly loess region, the area of improved vegetation accounted for 94.2%, mainly with moderate improvement. The area of vegetation improvement on slopes accounted for more than 80%. The obvious improvement at 7°-35° slopes constituted more than 51%. Therefore, the effect of the Grain for Green Project was obvious.

关 键 词：MODIS NDVI 植被变化 退耕还林还草工程 最大值合成法 GIS 

分 类 号：Q948[生物学—植物学]