我国近10年月平均NDVI空间分布特征分析

发布时间：2018-03-27 06:10

本文选题：NDVI　切入点：遥感　出处：《国土资源遥感》2017年02期

【摘要】：为研究我国近10 a月平均NDVI空间分布特征,使用2005 2014年MOD/MYD13C2植被指数产品得到全国多年分月NDVI;在考虑不同月份NDVI高、中、低值区面积变化的同时,结合DEM数据,分析植被覆盖随季节变化的规律和NDVI随坡向、海拔的变化规律。结果表明:NDVI低值段[-0.25,0.15)面积冬季高、夏季低,代表裸土、荒地和部分水体的特征;中值段[0.15,0.55)面积呈"双峰双谷"分布,春、秋季高于冬、夏季,体现植被覆盖下混合地物的特征;高值段[0.55,0.95]面积夏季高、冬季低,反映了植被覆盖随季节变化的规律。NDVI随坡向变化呈"双峰双谷"分布,东南、西北坡高于西南、东北坡。NDVI随海拔升高出现3个递减带(250~1 250 m,2 500~3 000 m和3 750~6 000 m)和2个递增带(1 250~2 500 m和3 000~3 750 m)。受我国气候及地理、地形等要素影响,NDVI的水平和垂直向空间分异显著。此规律可为陆面过程研究提供参考。
[Abstract]:In order to study the spatial distribution characteristics of average NDVI in recent 10 years in China, the MOD/MYD13C2 vegetation index product of 2005 ~ 2014 was used to obtain the multimonthly NDVI in China, and the area variation of high, middle and low NDVI in different months was taken into account, and the DEM data were combined. The seasonal variation of vegetation cover and the variation of NDVI with slope direction and elevation were analyzed. The results showed that the area of low value section of NDVI was high in winter and low in summer, representing the characteristics of bare soil, wasteland and some water bodies. The area of the median section [0.15 ~ 0.55] is "double peak and double valley", which is higher in spring and autumn than in winter and summer, which reflects the characteristics of mixed ground objects under vegetation cover, and the area of high value section [0.55 ~ 0.95] is high in summer and low in winter. The distribution of NDVI is "double peak and double valley" with slope direction, the southeast and northwest slope is higher than that of southwest, the distribution of vegetation cover with seasonal variation is "double peak and double valley", and the northwest slope is higher than that of southwest. In the northeast slope, NDVI has three decreasing zones (2500m ~ (2500m) and 3 750m ~ (6 000 m)) and two increasing zones (1 250m ~ (2 500 m) and 3 000 ~ (750m) m) with the elevation increasing, which is influenced by the climate and geography of our country. The horizontal and vertical spatial differentiation of NDVI is significantly influenced by topography, which can be used as a reference for the study of land surface processes.
【作者单位】：安徽省公共气象服务中心;南京信息工程大学应用气象学院;南京信息工程大学地理与遥感学院地理信息系;浙江省湖州市气象局;
【基金】：国家自然科学基金项目“复杂地形下月平均气温分布式模型研究”(编号:41175077)资助
【分类号】：Q948;TP79

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