基于MODIS资料的贵州植被叶面积指数的时空变化及其对气候的响应

利用2000～2006年MODIS(Moderate Resolution Imaging Spectroradiometer)卫星遥感观测的植被叶面积指数月平均资料以及相应时段的月平均气温、降水的观测资料对贵州植被的时空变化进行了分析.结果表明贵州2000～2006年植被分布受水热条件控制表现出对气候因子不同的响应关系,其中对降水的响应关系比气温明显,特别是冬季和春季,而植被在夏季和秋季的分布主要受气温的制约,与降水的关系并不明显.从季节和年际尺度的时间变化角度而言,植被对气温的响应比对降水明显,季节变化和年际变化的相关系数分别为0.89和0.73(分别通过99.9%和95%信度检验).

The Spatiotemporal Variation of Leaf Area Index in Guizhou and Its Response to Climate Based on MODIS Data

Using monthly MODIS remote sensing data of leaf area index during 2000-2006 and the observed monthly air temperature and precipitation data, the spatiotemporal variation of vegetation in Guizhou was analyzed. The results show that the spatial pattern of vegetation over Guizhou in the past seven years is controlled by air temperature and precipitation, and presents different response to the climate factors. The response of vegetation distribution to precipitation is more obvious than that to temperature, especially in winter and spring. In summer and autumn, the vegetation growth is mainly dominated by temperature and its relationship with precipitation is not obvious. In view of temporal variations at seasonal and interannual scales, the response of vegetation to temperature is more marked in contrast with that to precipitation, and the correlations coefficients between vegetation and temperature are 0.89 and 0.73, respectively (passing Student t-test at 99.9% and 95% confidence levels).