摘要:树木生长-气候关系对准确评估气候变化对森林生态系统影响、预测森林生产力与植被动态及揭示树木对气候变化的响适应策略至关重要。在全球变暖背景下，升温可能会对树木的生长产生影响，从而改变区域森林生态系统的生产力或碳储量。本研究利用生长-气候响应函数、滑动相关分析等树木年轮学方法，探讨伊春地区阔叶红松林内红松和红皮云杉径向生长的主要限制因子及两者径向生长对快速升温（1980年后）响应的异同。结果表明：1980年前红松径向生长有明显加速的趋势，红皮云杉上升趋势较弱；而1980年后红松径向生长趋势显著下降，红皮云杉则下降不明显。红皮云杉径向生长与上一年9月及当年6月平均气温显著负相关，而红松径向生长与上一年12月及当年1月、4月和6月最低气温显著正相关。1980年快速升温后，高温对两树种生长的抑制作用增强，尤其是红松。生长季末（9月）降水对红松和红皮云杉的限制作用由升温前的负相关转变为升温后的显著正相关。温度是限制红松和红皮云杉径向生长的主要气候因子，降水影响相对较弱；其中红松径向生长对气候变化的响应比红皮云杉更敏感。快速升温后，红松和红皮云杉生长-气候关系的变化可能与升温导致的暖干旱化有关。若气候变暖持续或加剧，二者径向生长的气候限制因子也将由温度转变为水分；红松和红皮云杉会出现生长衰退，尤其是红松。



Abstract:Tree growth-climate relationship is critical for accurately assessing the impact of climate change on forest ecosystems, predicting forest productivity and vegetation dynamics, and revealing tree adaptation strategies to climate change. In the context of global warming, rising temperatures may have an impact on tree growth, thereby changing the productivity or carbon storage in regional forest ecosystems. We investigated the main climatic limiting factors of radial growth of Korean pine (Pinus koraiensis) and Korean spruce (Picea koraiensis) in broad-leaved Korean pine forests in Yichun city, China. We also discussed the similarities and differences of their response to rapid warming (after 1980) by using the growth-climate response function analysis, moving correlation analysis, and other dendroclimatology methods. The results showed that the radial growth of Korean pine was accelerated before 1980, and the upward trend of Korean spruce was weaker than that of Korean pine. However, after 1980, the radial growth trend of Korean pine was significantly decreased, while that of Korean spruce was not. The radial growth of Korean spruce was significantly negatively correlated with the mean temperature in previous September and current June, while the radial growth of Korean pine was significantly positively correlated with the minimum temperatures in previous December and January, April and June of the current year. After rapid warming in 1980, the high temperature significantly increased the growth inhibition of the two species, especially for the Korean pine. The limiting effect of precipitation at the end of growing season (September) on Korean pine and Korean spruce changed from the negative correlation before warming to significant positive correlation after warming. In general, temperature is the main climate factor limiting the radial growth of Korean spruce and Korean, followed by precipitation.The radial growth of Korean pine was more sensitive to climate change than that of Korean spruce. After rapid warming, the change of growth-climate relationship of Korean pine and Korean spruce may be related to the 'Warm-dry Phenomenon' caused by the warming. If climate warming continues or intensifies, the climatic limiting factor of the radial growth of the two species will change from temperature to moisture, and their radial growth will decline, especially for Korean pine.





PDF全文下载地址:

https://www.ecologica.cn/stxb/article/pdf/stxb201812292845