4.8 Article

Rewetting global wetlands effectively reduces major greenhouse gas emissions

期刊

NATURE GEOSCIENCE
卷 15, 期 8, 页码 627-+

出版社

NATURE PORTFOLIO
DOI: 10.1038/s41561-022-00989-0

关键词

-

资金

  1. National Natural Science Foundation of China [42071022]
  2. Southern University of Science and Technology [29/Y01296122, G02296302]
  3. Innovation and Technology Fund of the HKSAR, China
  4. Swedish National Strategic Research Program: Biodiversity and Ecosystem Services in a Changing Climate (BECC)
  5. Swedish National Strategic Research Program: Modelling the Regional and Global Earth system (MERGE)
  6. CLAND Convergence Institute [16-CONV-0003]

向作者/读者索取更多资源

Carbon and nitrogen losses from degraded wetlands and methane emissions from flooded wetlands are important factors contributing to greenhouse gas emissions. The study shows that greenhouse gas emissions from wetlands are lowest when the water table is near the surface. Re-wetting wetlands can significantly reduce future emissions.
Carbon and nitrogen losses from degraded wetlands and methane emissions from flooded wetlands are both important sources of greenhouse gas emissions. However, the net-exchange dependence on hydrothermal conditions and wetland integrity remains unclear. Using a global-scale in situ database on net greenhouse gas exchanges, we show diverse hydrology-influenced emission patterns in CO2, CH4 and N2O. We find that total CO2-equivalent emissions from wetlands are kept to a minimum when the water table is near the surface. By contrast, greenhouse gas exchange rates peak in flooded and drained conditions. By extrapolating the current trajectory of degradation, we estimate that between 2021 and 2100, wetlands could result in greenhouse gas emissions equivalent to around 408 gigatons of CO2. However, rewetting wetlands could reduce these emissions such that the radiative forcing caused by CH4 and N2O is fully compensated by CO2 uptake. As wetland greenhouse gas budgets are highly sensitive to changes in wetland area, the resulting impact on climate from wetlands will depend on the balance between future degradation and restoration. Global in situ observations show greenhouse gas emissions from wetlands are lowest when the water table is near the surface, and therefore rewetting wetlands could substantially reduce future emissions.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.8
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据