树木的抵抗力在控制极端增长抑制方面超过了气候驱动因素
Yuntao Dong1,2,3, Ouya Fang1,3, Ying Deng1,3
1Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.
iScience
|July 23, 2025
概括
树木的抵抗力,不仅仅是气候极端,显著影响树木生长抑制. 较老的树木表现出较低的抵抗力,突出了气候变化下的森林动态的内在因素.
科学领域:
- 牙生态学 牙生态学
- 森林生态 森林生态
- 气候变化科学 气候变化科学
背景情况:
- 传统上,极端气候被认为是树木极端增长抑制 (EGS) 的主要驱动因素.
- 树木固有的抗性对EGS的影响还不太清楚,这代表着一个重要的知识差距.
研究的目的:
- 量化树木内在抵抗力与外部气候因素对EGS的影响.
- 研究生理和年龄相关途径在树木抵抗中的调解作用.
- 挑战 dendroecology 中普遍存在的以气候为中心的范式.
主要方法:
- 在西藏高原61个地区的2631棵树中分析了4599个极端增长抑制事件.
- 应用随机森林和零碎结构方程模型来评估因素影响.
- 对EGS的直接生理和间接与年龄相关影响的量化.
主要成果:
- 树木的耐力对EGS的可能性的影响是当年的气候变量的影响的1.7倍.
- 树的年龄被发现会负面调节抵抗能力.
- 直接的生理途径和间接的与年龄有关的影响均介于抗性的影响.
结论:
- 树木的内在抵抗在调解EGS方面发挥的作用比以前被认为的更为关键.
- 树木的年龄显著影响了耐药能力,挑战了仅仅关注气候的问题.
- 整合弹性的一种新的机制框架推进了气候变化下的森林动态预测模型.
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