亚马逊的甲排放量很大,
Sunitha R Pangala1, Alex Enrich-Prast2,3, Luana S Basso4
1School of Environment, Earth and Ecosystem Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK.
Nature
|December 7, 2017
概括
亚马逊湿地树木是大气甲 (CH4) 的主要来源,严重低估了该地区的排放量. 这对于了解全球甲预算至关重要.
科学领域:
- 环境科学
- 生物地质化学
- 大气科学
背景情况:
- 湿地是大气中甲 (CH4) 的全球主要来源,这是一个强大的温室气体.
- 亚马逊洪水平原的现有甲排放清单,是一个主要的热带CH4来源,低估了大气CH4负担.
- 这种差异突显了亚马逊湿地对全球CH4排放的贡献的重大知识差距.
研究的目的:
- 测量来自亚马逊洪水平原树干的甲 (CH4) 流量.
- 确定湿地树木在亚马逊CH4预算中的作用.
- 协调区域CH4排放的"自下而上"和"自上而下"估计.
主要方法:
- 在13个地点测量了2,357棵亚马逊洪水平原树干的CH4流量.
- 分析发出CH4的稳定碳同位素值 (δ13C),以确定来源.
- 使用"自上而下的"大气概况 (2010-2013) 估计的区域CH4排放量,并与"自下而上的"流量测量进行比较.
主要成果:
- 亚马逊树干的甲排放量是温带或泥森林的200倍.
- 树干排放是区域CH4的主要来源,估计为15.121.2 Tg/年.
- 同位素特征 (δ13C为-66.2±6.4‰) 证实了树木排放的CH4的土壤生物起源.
结论:
- 通过湿地树木逃出土壤气体是亚马逊CH4排放的主要原因.
- 亚马逊树木约占该地区湿地CH4排放量的一半,对全球甲预算产生重大影响.
- 该研究成功地调和了"自上而下的"和"自下而上的"估计,解决了亚马逊CH4排放的低估.
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