Wetland ecosystem is an important carbon pool in the world. Wetlands have the highest carbon density of all terrestrial ecosystems. Wetland soils and peat are long-term reservoirs for carbon. In terms of greenhouse gases, wetlands can either be sources or sinks of carbon dioxide(CO2), methane(CH4) and nitrous oxide (N2O). There are influence of many factors the carbon cycle process in wetlands. Drainage of wetlands significantly increases CO2 emission. Some researches show that wetland protection and restoration are helpful to carbon accumulation and GHG reduction. So protection of wetland carbon stock can mitigate global climate change. According to some new results of the studies on the relationship of wetlands and the global climate change, this paper put it emphasis on wetland carbon stock, carbon balance and influences of land use on GHG emission in wetlands.
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