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.DOCVIP

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 丹利1( 谢明2 中国科学院东亚区域气候-环境重点实验室，中国科学院大气物理研究所，北京，100029 贵州毕节地区气象局，贵州，551700 摘 要 利用MODIS 2000-2006年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与降水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年的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。植被从季节和年际尺度的时间变化角度而言对气温的响应比降水明显，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)。 关键词 叶面积指数 气温 降水 时空响应 中图分类号P461 The spatiotemporal variation of leaf area index in Guizhou and its response to climate based on MODIS data Dan Li1 Xie Ming2 START Regional Center for Temperate East Asia and Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029. Bijie Meteorological Bureau of Guizhou Province, Guizhou, 551700 Abstract 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 7 years is controlled by air temperature and precipitation and presents different response to the climate factor. 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 variation at seasonal and interannual scale, 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 99.9% and 95% confidence level in a student t-test). Key words leaf area index air temperature precipitation spatiotemporal response 1. 引言 植被对气候的响应是全球变化研究领域的一个重要方向 (温刚与符淙斌, 2000)，其中利用植被指数研究植被的时空变化是在全球变化背景下探索植被与气候关系的一个手段(Dan et al., 2007)，比如以往的研究( 王澄海