卫星观测显示,温带森林中基于特征的多样性和干旱应对之间的积极关系
Isabelle S Helfenstein1, Joan T Sturm1, Bernhard Schmid1
1Remote Sensing Laboratories, Department of Geography, University of Zurich, Zurich, Switzerland.
Global change biology
|February 3, 2025
概括
森林的功能多样性增强了对干旱的抵抗力和弹性. 较大的特征丰富性改善了反应,而特征均性显示出混合效应,表明互补性和主导性是森林干旱适应的关键.
科学领域:
- 生态生态学 生态生态学
- 森林科学 森林科学 森林科学
- 遥感 遥感 遥感 遥感
背景情况:
- 气候变化正在增加干旱等极端事件的频率和强度.
- 森林生态系统的功能和服务受到这些极端气候的威胁.
- 生物多样性-生态系统功能 (BEF) 实验显示生物因素,如树种组成,影响干旱反应,但缺乏大规模验证.
研究的目的:
- 研究在温带混合森林中遥感功能多样性和森林干旱反应之间的关系.
- 评估树冠特征的功能丰富性和均性如何与干旱期间的森林抵抗力,恢复力和弹性有关.
- 弥合实验BEF发现与大规模,非实验性森林动态之间的差距.
主要方法:
- 利用 Sentinel-2 卫星数据,根据生理树冠特征 (叶绿素,胡卜素/叶绿素比率,等效水厚) 来量化功能多样性.
- 评估2017-2020年瑞士温带混合森林的森林干旱应对能力 (抗性,恢复性,弹性).
- 分析了功能多样性指标 (丰富性,均性) 和各种聚合级别的干旱反应之间的关系.
主要成果:
- 森林中较高的特征丰富度与干旱抵抗力和弹性正相关.
- 特征均性与阻力呈现形关系,与弹性呈现负关系.
- 这些发现表明,互补性 (丰富性) 和主导性 (均性) 两种效应都有助于森林对干旱的适应.
结论:
- 森林的功能多样性,可以通过遥感量化,在减轻大规模干旱影响方面发挥着至关重要的作用.
- 该研究将生态系统功能与非实验环境中的生物多样性联系起来,支持BEF理论.
- 结果为森林管理和保护战略提供了洞察力,以应对日益严重的气候极端情况.
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