Impact of global warming on the emission of greenhouse gases in the wetland system

Along with the increase ol human activities in recent years, the contents of CO_2 , CH_4 and N_2O in the atmosphere have been gradually increased and caused the rise of the global temperature . The paper systematically reviewed the emission mechanism of greenhouse gases like CO_2, CH_4 and N_2O in the wetland system. The research of the temperature rise impact on greenhouse gas emission from the wetland system is also discussed as well. The increase of temperature can extend the plant growing season and promote the productivity of wetland ecosystems, which would significantly impact the wetland ecosystem stability. The global warming could induce the conversion between the sources and sinks of the emitted greenhouse gases CO_2, CH_4 and N_2O and then promote of the greenhouses emission intensity, which would form a positive feedback influence on the global temperature. Temperature rise can enhance the CO_2 emission from wetlands and reduce the capability of soil carbon sink, or even transform into a net carbon source. Except the temperature rise in summer season, the temperature rise in other seasons can also increase the CH_4 emission intensity irom the wetlands. Wetland soil nitrification and denitrification can be promoted by the temperature rise, resulting in the enhancement of N_2O generation and emission. At the same time, the temperature rise is able to reduce water level and soil moisture of the wetland, which restrain the increasing intensity of greenhouse gas emission in certain extent. And then the further researches are also prospected.