甲排放部分抵消全球湿地的碳汇功能:基于全球数据的分析
Peng-Fei Zhan1, Chuan Tong1,2
1School of Geographical Sciences/School of Carbon Neutrality Future Technology, Fujian Normal University, Fuzhou 350117, China.
Ying yong sheng tai xue bao = The journal of applied ecology
|November 24, 2023
概括
湿地吸收二氧化碳 (CO2),但释放甲 (CH4). 碳化合物排放部分抵消了二氧化碳的吸收,一些湿地在较短的时间范围内成为温室气体净来源.
科学领域:
- 环境科学 环境科学
- 气候变化研究 气候变化研究
- 生态系统的碳循环循环.
背景情况:
- 湿地是大气中大量的二氧化碳 (CO2) 沉地.
- 湿地的无氧条件导致甲 (CH4) 排放.
- 碳化合物排放对全球湿地的净碳平衡的影响尚未完全理解.
研究的目的:
- 在各种湿地生态系统中进行全球数据分析,以CH4排放抵消CO2 (NEE) 的净生态系统交换.
- 量化CH4排放对湿地总体温室气体平衡的贡献.
- 评估湿地的长期碳沉积潜力,同时考虑二氧化碳的吸收和CH4的释放.
主要方法:
- 收集了来自全球不同湿地 (内陆和沿海) 的NEE和CH4流量的同时测量.
- 用CH4的100年和20年全球变暖潜力计算二氧化碳等效流量 (CO2-eq流量).
- 分析了不同湿地类型的温室气体净平衡.
主要成果:
- 所有研究的湿地类型都充当了大气中的二氧化碳吸收器,具有不同的NEE值 (例如,红树林: -2011.0 g CO2·m-2·a-1).
- 碳化合物排放部分抵消了二氧化碳的吸收,在湿地类型中从14.0%到64.9% (100年级) 到192.0% (20年级) 之间.
- 一些红树林,泥炭泥土和非泥炭泥土湿地在20年内成为净二氧化碳相当的来源,但在100年内仍然是净碳汇.
结论:
- 湿地是重要的大气碳汇,即使考虑到长时间内的甲排放.
- 了解和减轻湿地CH4排放对于维持它们的碳汇功能和打击气候变暖至关重要.
- 需要有效的管理策略来保持湿地生态系统的气候调节作用.
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