亚洲内陆干旱区NDVI与树木生长的气候响应及其影响因素

基于亚洲内陆干旱区的树木年轮宽度指数（RWI）、归一化差异植被指数（NDVI）和气候数据，采用空间统计方法和相关分析法分析了NDVI和RWI变化的一致性，探讨了NDVI和RWI对气候的响应，揭示了影响NDVI和RWI气候响应的相关因素。结果表明：1982—2000年亚洲内陆干旱区的树木生长和NDVI均呈增加趋势，生长季NDVI与RWI大多具有同步性变化特征，大多数地区5、6月NDVI受同期气温的影响，而4、5月NDVI主要受同期降水的影响；RWI主要受6—7月气温和4、6月和7月降水或帕默尔干旱指数（PDSI）的影响；大部分地区的NDVI和RWI对气温的响应具有一致性，但它们对降水或PDSI的响应存在很大差异；海拔和水热条件对不同地区的NDVI和RWI的气候响应有较大的影响。本研究对于认识亚洲内陆干旱区植被与树木生长的气候响应及其影响因素具有一定的科学意义。

Climatic responses of NDVI and tree growth in the arid areas of inland Asia and their influencing factors

Based on tree-ring width index （RWI）， normalized differential vegetation index （NDVI） and climate data in the arid areas of inland Asia， spatial statistical and correlation analysis methods are used to analyze the consistency of NDVI and RWI changes， discuss the climatic response of NDVI and RWI， and reveal the related factors affecting the climate response of NDVI and RWI. The results showed that the growth of trees and vegetation in the arid areas of inland Asia showed an increasing trend in 1982-2000. Most of the NDVI and RWI in the growing season had the characteristics of synchronous changes. In most regions， NDVI in May and June was affected by the temperature of the same period， while the NDVI in April and May was mainly affected by the precipitation of the same period； RWI is mainly affected by temperature in June and July and precipitation or Palmer Drought Severity Index （PDSI） in April， June and July. The responses of NDVI and RWI to temperature are consistent in most regions， but there are great differences in their responses to precipitation or PDSI. The climatic responses of NDVI and RWI were significantly affected by altitude and hydrothermal conditions in different regions. This study has certain scientific significance for understanding the climate response and influencing factors of vegetation and tree growth in the arid areas of inland Asia.