Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China; Institute of Ecological Conservation and Restoration, Chinese Academy of Forestry, Beijing 100093, China.
School of Forestry and Wildlife Science, Auburn University, AL 36830, United States.
Sci Total Environ. 2022 Jul 15;830:154742. doi: 10.1016/j.scitotenv.2022.154742. Epub 2022 Mar 24.
Global climate change and the increase in the frequency and intensity of drought have led to widespread forest decline and tree mortality. Studying the resilience components of tree growth to drought, including resistance (R), recovery (R), and resilience (R) and the influencing factors, helps assess forests' production and ecological stability under a changing climate. This study analyzed the responses of three resilience components of natural Mongolian pine (Pinus sylvestris var. mongolica) to drought events by examining individual-tree characteristics in two sites of Hulunbuir using the linear mixed effect model. The result showed that drought severity, diameter at breast height (dbh), pre-drought growth, and growth variability prior to drought had significant effects on the three resilience components of Mongolian pine growth. Specifically, as drought severity, dbh and growth variability increased, the R and R decreased, but R increased, showing a trade-off relationship with R. However, the R, R, and R decreased with pre-drought growth. Inter-tree competition and tree age also significantly impacted two resilience components. Besides, the interaction term between tree competition and tree age negatively affects R and R but positively affects R. Our findings highlight the influence of drought severity and individual-tree characteristics on drought resilience components, which can serve the adaptive management of natural Mongolian pine forests in the future.
全球气候变化以及干旱频率和强度的增加导致了广泛的森林衰退和树木死亡。研究树木生长对干旱的恢复力组成部分，包括抵抗力（R）、恢复力（R）和恢复力（R）以及影响因素，有助于评估森林在气候变化下的生产力和生态稳定性。本研究通过使用线性混合效应模型，分析了在两个呼伦贝尔地区的个体树木特征，来研究天然樟子松（Pinus sylvestris var. mongolica）对干旱事件的三个恢复力组件的响应。结果表明，干旱严重程度、胸径（dbh）、干旱前的生长和干旱前的生长变异性对樟子松生长的三个恢复力组件有显著影响。具体来说，随着干旱严重程度、dbh 和生长变异性的增加，R 和 R 减小，而 R 增加，表现出与 R 的权衡关系。然而，R、R 和 R 随着干旱前的生长而减少。树木间的竞争和树龄也显著影响了两个恢复力组件。此外，树龄与树木竞争的相互作用项对 R 和 R 有负面影响，但对 R 有积极影响。我们的研究结果强调了干旱严重程度和个体树木特征对干旱恢复力组件的影响，这可以为未来天然樟子松森林的适应性管理提供参考。
