Zheng Zhuang Peng, Zhao Si Yuan, Zhou Fei Fei, He Jin Fu, Hu Shan Bin, Dong Zhi Peng, Chen Shi Yin, Fang Ke Yan
College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China.
Cultuvation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China.
Ying Yong Sheng Tai Xue Bao. 2019 Mar;30(3):805-813. doi: 10.13287/j.1001-9332.201903.003.
Mean sensitivity (MS) of tree ring is a key index representing the sensitivity of tree rings to climate. Understanding the variation of MS and its influencing factors at a large area is helpful to understand the interaction between tree growth and climate. We used 573 tree-ring width chronologies in Asia from the International Tree Ring Date Bank (ITRDB) to examine the variation of tree-ring sensitivity and potential influencing factors. The results showed that the MS of trees was high in the arid regions and cold regions. Precipitation was more important than temperature in diriving MS. Consistent with the pattern of up-down-up for precipitation, MS showed a down-up-down fluctuation with increasing altitude, indicating that precipitation affected by altitude was a key climate factor for the MS. MS had great difference due to different physiological traits among tree species. Light-adapted species, such as Juniperus przewalskii and Pinus gerardiana, had high MS due to drought tole-rance. Shade-adapted species, such as Picea and Abies, had low MS. Old trees may have high MS.
树木年轮的平均敏感度（MS）是表征树木年轮对气候敏感度的关键指标。了解大面积区域内MS的变化及其影响因素，有助于理解树木生长与气候之间的相互作用。我们利用国际树木年轮数据库（ITRDB）中亚洲地区的573个树木年轮宽度年表，研究了树木年轮敏感度的变化及其潜在影响因素。结果表明，干旱地区和寒冷地区树木的MS较高。在驱动MS方面，降水比温度更为重要。与降水的上-下-上模式一致，MS随海拔升高呈下-上-下波动，表明受海拔影响的降水是影响MS的关键气候因子。由于树种间生理特性不同，MS存在很大差异。适应光照的树种，如祁连圆柏和西藏白皮松，因耐旱性而具有较高的MS。适应遮荫的树种，如云杉属和冷杉属，MS较低。老龄树木可能具有较高的MS。
