全球湿地(表面)再湿润可以有效减少主要温室气体的排放[Nature Geoscience,2022]http://www.jlakes.org/ch/reader/view_news.aspx?id=20220801164101001

Junyu Zou  1 , Alan D. Ziegler  2 , Deliang Chen  3 , Gavin McNicol  4, Philippe Ciais5,6, Xin Jiang1 , Chunmiao Zheng  1,7, Jie Wu1,8, Jin Wu9,10, Ziyu Lin1,9, Xinyue He  1,11, Lee E. Brown  12, Joseph Holden  12, Zuotai Zhang1 , Sorain J. Ramchunder13, Anping Chen  14 and Zhenzhong Zeng. Rewetting global wetlands effectively reduces major greenhouse gas emissions. Nature Geoscience,2022.

Abstract: 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.