ON THE RELATION BETWEEN RAINFALL AND THE NORMALIZED DIFFERENCE VEGETATION INDEX FOR DIVERSE VEGETATION TYPES IN EAST-AFRICA
ON THE RELATION BETWEEN RAINFALL AND THE NORMALIZED DIFFERENCE VEGETATION INDEX FOR DIVERSE VEGETATION TYPES IN EAST-AFRICA
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DOI：
10.1080/01431169308954042
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发表时间：
1993-08-01
影响因子：
3.4
通讯作者：
NICHOLSON, SE
中科院分区：
文献类型：
--
作者：
DAVENPORT, ML;NICHOLSON, SE
这项研究是在东非的归一化差异植被指数（NDVI）和降雨量之间的关系的调查。这两个变量的时间和空间模式及其相互关系进行了评估。的NDVI和降雨量的协会进行了分析，东非的十个植被形成：四个森林区，两个林地区，和四个干燥的灌木丛，灌木丛和草地类型。当年降雨量低于1000 mm，月降雨量不超过200 mm时，NDVI的时空分布具有很强的相似性。在此范围内，NDVI也是反映降雨年际变化的敏感指标。NDVI与降雨量之间的总体关系是对数线性的，65个站的年积分NDVI与年降雨量的对数之间的相关性为0.89。月时间尺度上的最佳相关性是月综合归一化植被指数与同期和前两个月的三个月平均降雨量之间的相关性。10种植被类型的水分利用效率差异很大，灌木丛和灌丛区的水分利用效率最高，沿海森林的水分利用效率最低。
This study is an investigation of the relation between the Normalized Difference Vegetation Index (NDVI) and rainfall in East Africa. The temporal and spatial patterns of both variables and their inter-relationships are evaluated. The NDVI and rain-fall associations are analysed for ten vegetation formations of East Africa: four forest zones, two woodland zones, and four drier bush, thicket and grassland types. There is a strong similarity between temporal and spatial patterns of NDVI when annual rainfall is below about 1000 mm and monthly rainfall does not exceed approximately 200 mm. In this range, NDVI is also a sensitive indicator of the inter-annual variability of rainfall. The overall relation between NDVI and rainfall is log-linear and the correlation between annually-integrated NDVI and the log of annual rainfall at 65 stations is 0.89. The best correlation on a monthly time scale is between the monthly composite NDVI and a three-month average of rainfall in the concurrent and two previous months. Considerable differences in water-use efficiency are apparent among the ten vegetation formations, the highest being in the bush and thicket zones, the lowest in the coastal forest with exceedingly high rainfall.