昆虫对全球森林枯木的贡献
Sebastian Seibold1,2,3,4, Werner Rammer5, Torsten Hothorn6
1Ecosystem Dynamics and Forest Management Group, School of Life Sciences, Technical University of Munich, Freising, Germany. sebastian.seibold@tum.de.
Nature
|September 2, 2021
概括
昆虫极大地加快了木材的腐烂, 尤其是在热带森林. 这种昆虫活动在全球释放大量碳, 凸显它们在森林碳循环中的关键作用.
科学领域:
- 生态学
- 森林管理
- 生物地质化学
背景情况:
- 大约有8%的森林碳存储在枯木中.
- 分解速度受气候和微生物和昆虫等分解剂的影响.
- 昆虫对枯木分解和碳释放的全球影响尚不清楚.
研究的目的:
- 研究昆虫在全球森林生态系统中腐烂的作用.
- 量化气候 (温度和降水) 对分解速度的影响.
- 估计来自枯木分解的全球碳流量,考虑到昆虫的贡献.
主要方法:
- 在6个大陆的55个森林中进行了大规模实地实验.
- 收集有关分解速度,温度,降水和昆虫/微生物活动的数据.
- 在全球枯木碳地图上应用实验衍生分解函数.
主要成果:
- 枯木的分解速度随着温度的增加而增加,尤其是在高降水的情况下.
- 昆虫在热带森林中加速分解 (平均质量损失为每年3.9%),在温带森林 (0.9%) 和北极森林 (-0.1%) 中的影响较弱.
- 全球年碳排放量估计为10.9±3.2 petagram,其中93%来自热带森林.
- 昆虫占全球枯木碳排放量的29%.
结论:
- 昆虫在枯木分解和全球碳循环中发挥着重要作用.
- 气候,特别是温度和降水,显著调节了分解速度.
- 热带森林是全球碳排放的主要来源,
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