Jia Han-Sen, Gao Jun, Zhang Jin-Song, Meng Ping, Sun Shou-Jia
Research Institute of Forestry, Chinese Academy of Forestry/Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China.
Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China.
Ying Yong Sheng Tai Xue Bao. 2021 Aug;32(8):2857-2865. doi: 10.13287/j.1001-9332.202108.012.
To explore the effects of diameter class on the climate-growth relationship of trees, the width chronologies of ringwood, earlywood, and latewood of were established in the low altitude area of the south aspect of the Taihang Mountains. We estimated the sensitivity of radial growth of two diameter classes of . plantation to climate. The effects of drought events on . plantation was quantified by superimposed time analysis. Under climate change, we aimed to provide reference data for sustainable management of . . Our results showed that the mean sensitivity of ringwood and latewood of large diameter classes were higher than small diameter classes. The mean sensitivities of earlywood of small diameter classes were higher than large diameter classes. The latewood was the most sensitive component of tree-ring. The responses of the standard chronological indices of two diameter classes to climate factors were similar. The growth of ringwood and latewood of small diameter classes were more sensitive to the climatic factors from June to August. The earlywood was more sensitive to the climatic factors before the growing season (from January to February). Furthermore, the earlywood of large diameter classes was more sensitive to the climatic factors of the last year, with a stronger hysteresis effect. It suggested that . was sensitive to drought. The radial growth of . of ringwood and latewood in drought year was significantly lower than that of last year. The reduction of . with large diameters was higher than that of small diameters, but with higher growth recovery degree after drought.
为探究直径级对树木气候-生长关系的影响，在太行山南坡低海拔地区建立了[树种名称]的边材、早材和晚材宽度年表。我们估算了[树种名称]人工林两个直径级的径向生长对气候的敏感性。通过叠加时间分析量化了干旱事件对[树种名称]人工林的影响。在气候变化背景下，旨在为[树种名称]人工林的可持续经营提供参考数据。结果表明，大直径级边材和晚材的平均敏感性高于小直径级。小直径级早材的平均敏感性高于大直径级。晚材是树木年轮中最敏感的组成部分。两个直径级的标准年表指数对气候因子的响应相似。小直径级边材和晚材的生长对6-8月的气候因子更敏感。早材对生长季前（1-2月）的气候因子更敏感。此外，大直径级早材对前一年的气候因子更敏感，滞后效应更强。这表明[树种名称]对干旱敏感。干旱年份[树种名称]边材和晚材的径向生长显著低于上一年。大径级[树种名称]的减少幅度高于小径级，但干旱后生长恢复程度更高。
