Abstract:

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.

Key words: tree-ring, NDVI, climatic response, influencing factors, arid areas of inland Asia