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当地甲生成驱动着来自凉爽温带高地森林上层树干的大量甲排放
Takumi Mochidome1, Teemu Hölttä2, Susumu Asakawa3
1Graduate School of Agriculture, Kyoto University, Kyoto, Kyoto Prefecture, 606-8224, Japan.
The New phytologist
|July 2, 2025
概括
树干的甲排放量很大,特别是树干的上层部分. 这项研究表明,上部干部部分可以产生和排放甲,这表明需要将它们纳入未来的测量.
科学领域:
- 森林生态 森林生态
- 生物地质化学生物地质化学
- 环境科学 环境科学
背景情况:
- 从树干中量化甲 (CH4) 排放对于理解森林碳循环至关重要.
- 来自树干上部的排放在很大程度上被忽视了,这导致了对总排放的潜在低估.
- 碳化合物排放的垂直模式以及树干内潜在的生物和物理过程尚未得到充分理解.
研究的目的:
- 为了研究来自树干的CH4排放的垂直模式.
- 为了确定树干内的现场CH4生产和运输机制.
- 评估上层树干部分对整体树木CH4排放的贡献.
主要方法:
- 测量了CH4排放量,内部CH4度,以及三种树木的六棵树上不同高度 (高达12米) 的甲原始基因mcrA的丰度.
- 分析了树干组织中的CH4生产率.
- 模拟的CH4运输在干部使用扩散-advection方程.
主要成果:
- 总CH4排放的很大一部分 (44-89%) 来自3米以上的干部部分,在4-6米之间观察到的峰值排放.
- 检测到CH4产量和mcrA存在的距离高达12米,这表明上半身上部有活跃的甲基生成.
- CH4运输模拟表明从下部到上部的长途运输有限,这意味着当地生产是关键来源.
结论:
- 树干的上部是甲排放的重要来源,通常在相同的高度产生甲.
- 目前的方法可能会低估树木的CH4总排放量,因为不考虑上层树干的贡献.
- 未来的CH4排放清单应该包括整个树干的测量,包括上部部分.
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