土壤和大气干旱对树木环中的年内 δ13C 模式的影响
Valentina Vitali1,2, Jernej Jevšenak3,4, Georg von Arx2,5
1Department of Environmental Systems Science, Forest Ecology, Institute of Terrestrial Ecosystems, ETH Zürich, Universitätstrasse 16, Zürich 8092, Switzerland.
Tree physiology
|September 27, 2025
概括
树环中的高分辨率碳同位素比率 (δ13C) 可靠地反映了季节性干旱和干旱对针叶树生长的影响. 苏格兰松 (Pinus sylvestris) 是环境变化的关键指标物种.
科学领域:
- 登德罗年代学 登德罗年代学
- 稳定同位素 生物地质化学 稳定同位素
- 气候科学 气候科学
背景情况:
- 树环中的高分辨率碳同位素比率 (δ13C) 提供了季节性环境重建的潜力.
- 然而,对于了解生长条件的季内 δ13C 的可靠性受到复杂的木材形成过程的限制.
研究的目的:
- 调查瑞士阿尔卑斯山三种针叶树在一年内 δ13C 的变化.
- 评估 δ13C 对季节性土壤水潜力 (SWP) 和蒸汽压力缺陷 (VPD) 的反应.
- 确定 δ13C 的驱动因素,并重建生长季节的动态.
主要方法:
- 激光剥离同位素比质谱法用于每年10点的年内δ13C分析.
- 分析了季节性 δ13C 模式,以确定树木和物种之间的同步性.
- 与现场环境变量 (SWP,VPD) 的相关性分析确定了关键驱动因素.
主要成果:
- δ13C模式显示了跨物种的高同步性,反映了大气的干燥程度.
- 干旱条件阻碍了同化物融入西,揭示了特定物种和地点的值.
- 苏格兰松 (Pinus sylvestris) 与VPD和SWP的相关性最强.
结论:
- 大气和土壤干旱共同影响树木生长和针叶树的年度内 δ13C模式.
- δ13C分析为气候重建和森林动态提供了宝贵的见解.
- 观察到特定物种的反应:苏格兰松树作为一个强有力的指标,银杉 (Abies alba) 具有更长的整合季节,挪威杉 (Picea abies) 具有塑料反应.
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