欧洲常见树种的茎生长正在减少,尽管早期的生长已经开始
Arun K Bose1,2, Sophia Etzold1, Katrin Meusburger1
1WSL Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, Switzerland.
Global change biology
|July 7, 2025
概括
全球变暖推进了树木生长时间,但并没有增加年增长. 气温上升对树木生长动态产生负面影响,挑战了关于更长的生长季节抵消气候变化影响的假设.
科学领域:
- 森林生态森林生态学
- 气候变化科学 气候变化科学
- 植物生理学 植物生理学
背景情况:
- 全球变暖正在改变树木的现象学,观察到早春的出现.
- 虽然早期变暖可能会促进碳吸收,但其对树木生长的影响仍然不清楚.
- 了解气候变化带来的树木生长动态变化背后的机制至关重要.
研究的目的:
- 为了研究温度上升对树干辐射生长时间和动态的影响.
- 分析环境因素与年内和年内增长模式之间的关系.
- 评估由于变暖而导致的生长季节的延长是否有利于树木生长.
主要方法:
- 利用了来自瑞士48个森林站点的228棵树的每日树仪数据 (2012-2022).
- 研究了五种主要树种的生长时间,年内和年间动态以及环境控制.
- 对比了温度,降水和土壤水位对每周生长率的影响.
主要成果:
- 较高的冬季和春季温度导致较早的生长开始,但没有增加年度总增长.
- 在挪威杉,银和树中观察到显著的负增长趋势.
- 减少的生长与生长日数减少有关,季后气温对生长产生负面影响.
结论:
- 气候变暖并不一定转化为增加树木生长,这挑战了更长的生长季节抵消气候影响的概念.
- 温度是每周树木生长变化的关键驱动因素,比降水或土壤水更重要.
- 研究结果表明,中欧常见的树种可能不会从气候变暖导致的更长的生长季节中受益.
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