Responses of vegetation changes to climatic variations in Anning River Basin of upper Yangtze River Region
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摘要: 为探讨安宁河流域植被演变趋势及其与气候的相互作用,基于2001—2008年MODIS图像、降水量和气温数据,采用回归分析和相关分析等方法计算了安宁河流域降水、气温和归一化差值植被指数( normalized difference vegetation index,NDVI)在时间和空间上的变化情况,并对安宁河流域植被生长变化对气候条件的响应机制进行了探讨。结果表明:NDVI变化和气温、降水呈正相关;降水量和气温等气候因子的变动会直接反映在植被长势上,其中降水对安宁河流域植被生长的影响更为显著;植被长势与气温和降水存在一定的时间滞后性。Abstract: In order to explore the relationship between climate variation and vegetation change in Anning River Basin in the period from 2001 to 2008, the authors chose MODIS NDVI, precipitation data and temperature data as study materials and conducted regression analysis and other methods to obtain spatial-temporal change patterns of precipitation, temperature and NDVI in Anning River Basin; meanwhile, the response mechanism of vegetation change to climatic variations in Anning River Basin was investigated. The results show that NDVI is positively correlated with temperature and precipitation, and the precipitation and temperature affect the change of vegetation directly, but the influence of precipitation is more significant than that of temperature. In addition, there exists the feature of time-lag between vegetation change and climate variation.
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Key words:
- vegetation /
- climate /
- response mechanism /
- Anning River Basin
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