淮河流域NDVI周期性分析

Periodicity Analysis of NDVI Time Series in the Huaihe River Basin in China

利用1982年1月到2006年12月的AVHRR（Advanced Very High Resolution Radiometer）GIMMS（Global Inventory Monitoring and Modeling Studies）NDVI数据，应用经验模态分解（EMD）方法，对淮河流域NDVI数据进行了周期分析。结果表明：淮河流域安徽段各站点SINDVI基本存在2—3a、9～10a、12—13a及15～16a的变化周期。其主要影响因子可能为气温和降水，而气候因子的周期性变化主要受海-气相互作用和太阳黑子活动的影响，进而影响植被的周期变化。

Based on the GIMMS NDVI data set during 1982-2006 in the Huaihe River Basin,a novel multiple time-scale analysis method, Empirical Mode Decomposition （EMD）,is used to diagnose the periodicities of NDVI. The resuhs indicate that SINDVI have the similar 2-3 Huaihe River Basin. The temperature and precipitation year, 9-10 year, 12-13 year and 15-16 year period in may be the significant factor affecting the vegetation in the Huaihe River Basin. The periodicity of climate factor may be concerned with the laws of motions of heaven bodies and the medium-wave cycle of macula,they are all caused by solar activity.