基于MODIS的植被指数对估测塔里木河中下游植被盖度的适用性  

The applicability of VIs from MODIS in estimating vegetation cover in the middle and lower reaches of the Tarim River

作　　者：林茜[1] 郭飞[1,2,3] 黄昌春[1,2,3] 杨雪峰[4] 

机构地区：[1]南京师范大学虚拟地理环境教育部重点实验室,江苏南京210023 [2]江苏省地理环境演化国家重点实验室培育建设点,江苏南京210023 [3]江苏省地理信息资源开发与利用协同创新中心,江苏南京210023 [4]新疆师范大学地理科学与旅游学院,新疆乌鲁木齐830054

出　　处：《草业科学》2016年第12期2434-2441,共8页Pratacultural Science

基　　金：国家自然科学基金(41571386)

摘　　要：以干旱荒漠区塔里木河中下游的植被为研究对象,采用长时间序列的MODIS数据构建研究区常用的4种植被指数[归一化植被指数(NDVI)、差值植被指数(DVI)、增强型植被指数(EVI)、比值植被指数(RVI)],并通过遥感方法和Image J软件获得研究区植被覆盖度,分析发现与实测的植被覆盖度有显著相关性。从Image J获得的植被覆盖度与4种植被指数的回归结果可以得出4种植被指数在研究区的适用性,从而优选出最适合此研究区的植被指数。结果表明,基于MODIS的4种植被指数与研究区实际植被覆盖度之间存在显著的正相关关系,各植被指数与研究区植被覆盖度的拟合程度由高到低依次是NDVI>EVI>RVI>DVI,使用NDVI获取植被信息最为适宜。To more accurately determine vegetation information for the mid-lower reaches of the Tarim River in an arid desert region,we used MODIS data to calculate commonly used vegetation indices（VIs,normalized difference vegetation index[NDVI],difference vegetation index[DVI],enhanced vegetation index[EVI],ratio vegetation index[RVI]）.We combined remote sensing data using Image J software to acquire a vegetation coverage,and compared them with actual measurements.We concluded that they were significantly correlated.Next,we made a vegetation coverage map via Image J and vegetation indices in a 2Dscatter plot using regression analysis.Finally,we chose the most suitable VI among the four VIs.The study showed that each VI was positively correlated with vegetation coverage.The goodness of fit between VIs and vegetation coverage was ranked：NDVI,EVI,RVI,and DVI.Thus,we suggest the use of NDVI as the VI.

关 键 词：MODIS 植被指数 植被覆盖度 Image J 塔里木河流域 干旱荒漠区 

分 类 号：Q948[生物学—植物学]