秦岭南北NDVI动态变化及对气温和降水因子的响应

Research on variation of NDVI and its response to temperature and precipitation in northern and southern Qinling mountains

利用秦岭南北2000—2012年逐旬气温降水数据及SPOT-NDVI逐旬数据,基于经验正交函数(EOF)和奇异值分解(SVD)方法,分析了秦岭南北水热条件、归一化植被指数(NDVI)的空间变化特征及植被对水热条件变化的响应。结果表明:1气温降水空间分布在秦岭南北变化差异明显;2山区林草地与农业耕作区及城镇化地区NDVI差异显著;3受自然条件和遥感数据获取技术的影响,NDVI与气温和降水的相互影响关系复杂;受现代农业技术、生物工程及人类活动的影响,NDVI对自然气候要素的依赖程度降低。

Based on the meteorological data and 10-day SPOT-NDVI data in northern and southern Qinling Mountains from 2000 to 2012, and combined with EOF and SVD, the paper analyzed the spatial distribution characteristics of hydrothermal conditions and NDVI and vegetation response to temperature and precipitation. The results indicated that： ①The spatial distribution characteristics of temperature and precipitation in north and south sides of the Qinling Mountain were significantly different. ② NDVI is obviously different in mountain grassland, farming areas and urbanization area. ③Affected by natural conditions and remote sensing data acquisition technology, the mutual influence between NDVI and temperature and precipitation is complex. The dependence of NDVI on the natural climate has waned by affecting by the modern agriculture technology, biological engineering, and human activity.