Effects of warming on radial growth of Picea crassifolia in the eastern Qilian Mountains, China

doi:10.13287/j.1001-9332.202110.019

Abstract

Abstract: Tree-rings of Picea crassifolia from high (3000 m), middle (2750 m) and low (2500 m) altitudes were collected from the Xiying River basin in the eastern Qilian Mountains, with the standard chronology being established using dendrochronological methods. Results of the correlation analysis between tree-ring width index and temperature and precipitation during different periods showed that radial growth of P. crassifolia at different altitudes responded differently to climate warming in the eastern Qilian Mountains. Water and heat availability were the main limiting factors for the radial growth of P. crassifolia in the eastern part of Qilian Mountains. The growth limiting factors at different altitudes were generally the same. Before the prominent warming (1961-1986), radial growth of P. crassifolia at the three sampling altitudes was significantly negatively correlated with mean maximum temperature in July-August of the previous year and August of the current year, and significantly positively correlated with the relative humidity in June of the current year. After the prominent warming period (1986-2014), tree growth at high, middle, and low altitudes remained significantly negatively correlated with air temperature, changed from non-significantly negative to significantly positive correlation with relative humidity in February of the current year, and changed from significantly positive to non-significantly negative correlation with precipitation and relative humidity in June. Warming caused a slowing growth of P. crassifolia tree-ring at all altitudes, with the highest altitude being the most sensitive. Drought stress caused by climate warming might be the main reason for the changes of radial growth of P. crassifolia.

Key words: Qilian Mountains, Picea crassifolia, tree ring, climate warming, altitude

LIU Lan-ya, GOU Xiao-hua, ZHANG Fen, YIN Ding-cai, WANG Xue-jia, XIA Jing-qing, LI Qian, DU Miao-miao. Effects of warming on radial growth of Picea crassifolia in the eastern Qilian Mountains, China[J]. Chinese Journal of Applied Ecology, 2021, 32(10): 3576-3584.

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