Plants maintain their health through various ecological processes, among which resilience to external stresses has received increasing attention in recent years. By analyzing tree-ring data from 1762 sites, encompassing a total of 1,623,006 weak stresses (mean-2sd ≤ tree ring indices (TRI) < mean-sd) and 320,345 strong stresses (TRI < mean-2sd), we observed a significant growth increase following stresses for a subset of trees. We found that the growth increase was not a consequence of post-stress climate but an inherent property of trees’ response to stresses that could be called “rebound effect”. Across all the 16 genera studied, a similar proportion of trees, 26.23 % and 25.73 %, exhibits rebound effect in the first year after weak and strong stresses, respectively. The amplitudes of growth rebound, measured as the difference between the mean of ring-width indices in the rebounding year and the subsequent eight years, are 0.242 and 0.266 after weak and strong stresses, respectively. Conifers generally rebound at a higher proportion but to a lesser amplitude than broadleaves. Furthermore, a higher proportion and greater amplitude of rebound were observed in trees having longer age and slower growth. Our findings provide a new perspective of tree resilience to disturbances and shed insights into the processes of forest recovery after growth suppressions.

中文翻译：

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压力引发全球森林树木生长反弹


植物通过各种生态过程来维持健康，其中对外部压力的适应力近年来越来越受到关注。通过分析来自 1762 个地点的树木年轮数据，包括总共 1,623,006 个弱应力（平均值-2sd ≤树木年轮指数 （TRI） < 平均值-sd）和 320,345 个强应力（TRI < 平均值-2sd），我们观察到一部分树木在胁迫后生长显着增加。我们发现，生长增加不是胁迫后气候的结果，而是树木对胁迫反应的固有特性，可以称为“反弹效应”。在研究的所有 16 个属中，相似比例的树木 （26.23% 和 25.73%） 在弱胁迫和强胁迫后的第一年表现出反弹效应。在弱应力和强应力下，增长反弹幅度（以反弹年和随后 8 年环宽指数平均值之间的差值来衡量）分别为 0.242 和 0.266。针叶树通常以较高的比例反弹，但幅度小于阔叶树。此外，在年龄较大和生长较慢的树木中观察到更高的比例和更大的反弹幅度。我们的研究结果为树木对干扰的恢复力提供了新的视角，并为生长抑制后森林恢复的过程提供了新的见解。