经常出现的热干旱在苏格兰温带地区的松树林中造成持续的遗留效应
S Haberstroh1, A Christen2, M Sulzer2
1Ecosystem Physiology, Faculty of Environment and Natural Resources, University Freiburg, Freiburg, Germany.
Plant biology (Stuttgart, Germany)
|June 16, 2025
概括
2018年热干旱对德国松树林造成了持久的破坏,将其从碳汇转变为碳源. 经常出现的干旱加剧了这些遗留效应,影响了生态系统的碳交换.
科学领域:
- 生态生态学 生态生态学
- 气候变化研究 气候变化研究
- 森林科学 森林科学 森林科学
背景情况:
- 温带生态系统容易受到热干事件的影响,经历了重大影响和持久的遗留效应.
- 2018年热干旱严重影响了德国西南部的Pinus sylvestris L.森林,导致树木死亡率高,改变了生态系统的功能.
研究的目的:
- 为了调查2018年热干旱对Pinus sylvestris L.森林的遗留影响.
- 评估2018年后反复出现的热干旱对生态系统碳流和运作的影响.
主要方法:
- 结合生态生理学测量,遥感 (增强植被指数 - EVI) 和微气象数据 (生态系统碳交换网 - NEE).
- 分析了树冠结构,植被类型和碳交换季节性的变化.
- 生态系统碳平衡的量化转变,从沉到来源.
主要成果:
- 观察到2018年干旱的强烈和持久的遗留效应,包括高的Pinus sylvestris死亡率和转向落叶地板主导地位的转变.
- 根据EVI的数据显示,2018年以后,人们将转向以树叶为主导的森林树冠.
- 在2003-2006年间,生态系统从碳汇 (-391 ± 204 g C m−2年−1) 转变为碳中和 (+13 ± 28 g C m−2年−1) 在2021年.
- 在2018年之后的更热,更干燥的年份,生态系统成为碳源,在2022年达到+329 ± 19 g C m−2年−1的碳源.
结论:
- 复合干旱事件 (大气和地形) 导致2018年后生态系统显著释放碳.
- 强烈的干旱遗产影响在物种,社区和生态系统层面都很明显.
- 经常出现的干旱加剧了负面影响,将森林生态系统转变为净碳来源.
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