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Carbon sequestration potential of wetlands and regulating strategies response to climate change
Yajie Zhang1, Xiaolu Zhang1, Wei Fang1
1Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China.
Abstract:
Wetlands are important carbon sinks for mitigating climate warming. In this paper, greenhouse gas (GHG) fluxes and carbon sequestration capacity of freshwater wetlands, coastal wetlands and constructed wetlands around the world are evaluated, and strategies to improve carbon sequestration by wetlands are proposed based on the main influencing factors. Air temperature and average annual rainfall are significantly positively correlated with CH4 flux and N2O flux in freshwater wetlands and coastal wetlands. While chemical oxygen demand (COD) and total nitrogen (TN) concentrations of influent are found to be the main factors affecting GHG fluxes in constructed wetlands. The main factors affecting wetland carbon storage include the presence and species of wetland vegetation, ecological water level, and ecological pattern. Strategies for protecting and restoring existing wetlands, creating new wetlands, and strengthening the carbon sequestration capacity of wetlands are proposed. Fully realizing the carbon sequestration potential of wetlands holds the prospect of a more effective and sustainable response to global climate change.
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