内蒙古荒漠化年际动态变化及与气候因子分析  

Change and Analysis of Annual Desertification and Climate Factors in Inner Mongolia Using MODIS Data

作　　者：陈宝瑞[1] 辛晓平[1] 朱玉霞[1] 张宏斌[1] 

机构地区：[1]农业部资源遥感与数字农业重点开放实验室

出　　处：《遥感信息》2007年第6期39-44,I0004,共7页Remote Sensing Information

基　　金：863项目:草原生产数字化管理关键技术研究(2006AA10Z241)

摘　　要：荒漠化是内蒙古最为严重的生态问题之一。荒漠化是指包括气候变异和人类活动在内的种种因素造成的干旱、半干旱和亚湿润干旱地区的土地退化。通过EOS-MODIS遥感数据计算归一化植被指数(NDVI)和植被覆盖指数(Pv),求得荒漠化指数(DI)进行荒漠化地区的识别。现代荒漠化受多种因素的驱动作用,其中自然因素是非常重要的因素,利用自然因素中的气温和降水数据与荒漠化指数进行相关分析,得到的相关结果较好,可以反映出荒漠化与气温有较高的正相关,荒漠化与降水存在很好负相关。Desertification is one of the most serious eco-environmental problem in Inner Mongolia. It can be defined that the desertification is actually the phenomenon of vegetation decrease in both quality and quantity. In this paper EOS-MODIS data were applied to evaluate the severity of desertification in Inner Mongolia. A methodology has been proposed to use the red band and near infrared band of MODIS for monitoring/evaluating the desertification on the basis of surface vegetation changes. We first calculate the vegetation coverage index （VCI） in pixel scale, it was calculated from normalized difference vegetation index （NDVI）, and then applied it to construct the desertification index （DI） for evaluation of desertification severity. Although the desertification is caused by many factors, the changes of environmental factors play an important role in the process of desertification. Temperature and precipitation are used for the correlation with desertification. The result analysis shows that there exist positive correlations between desertification and temperature and precipitation.

关 键 词：荒漠化指数 内蒙古 EOS-MODIS降水 气温 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]