观察证据表明,2018年干旱对德国一片混合叶森林的遗留影响
Felix Pohl1, Ulrike Werban2, Rohini Kumar2
1Helmholtz-Centre for Environmental Research - UFZ, Permoserstraße 15, 04318, Leipzig, Germany. felix.pohl@ufz.de.
Scientific reports
|July 5, 2023
概括
2018年极端干旱对森林碳循环产生了重大影响,导致2019年的效果延迟,但2020年不会出现. 了解这些遗留效应对于准确评估碳汇容量至关重要.
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
- 气候变化研究 气候变化研究
背景情况:
- 森林是全球碳循环的关键组成部分,影响着陆地碳汇能力.
- 干旱是森林碳流量年间变化的主要驱动因素.
- 在生态系统规模上量化干旱对生态系统碳流的遗留影响是具有挑战性的,因为研究稀缺.
研究的目的:
- 调查极端干旱事件对混合树叶森林碳循环的延迟 (遗留) 影响.
- 分析干旱对生态系统净生产率 (NEP) 和碳流的影响.
- 评估水文气象条件和干旱历史在解释森林生产力的作用.
主要方法:
- 从2015年到2020年在德国的"Hohes Holz" (DE-HoH) 森林遗址上利用了旋共变度测量.
- 采用树回归来模型森林生产力与水气条件和干旱信息的关系.
- 在干旱前,干旱后和干旱后的年度NEP进行比较.
主要成果:
- 2018年极端干旱和高温事件在2019年对森林碳循环产生了重大遗留影响,但在2020年却没有.
- 与干旱前水平相比,干旱年 (2018年) 的生态系统净生产率 (NEP) 较高,在随后的一年 (2019年) 较低.
- 虽然目前的条件解释了2020年的生产力,但它们并没有完全解释2019年的下降;包括长期干旱数据改善了模型准确性.
结论:
- 极端干旱事件对生态系统的碳流产生复杂和多样化的影响,包括延迟的遗留效应.
- 干旱事件的时间,持续时间和规模影响它们对森林碳循环的影响.
- 一致的干旱定义是必要的,以区分生态系统对极端事件的立即和延迟反应.
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