KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCES
THE WORLD'S LEADING RESEARCH
INSTITUTE OF GEOSCIENCE
METHANE (CH4) GAS EMISSION AND THE CONTAMINANT DYNAMICS IN WETLANDS
Wetlands are known to play a crucial role in carbon cycling by storing organic carbon and releasing CO2 and CH4 to the atmosphere despite the fact that wetlands cover only a small proportion of the earth's land surface. In general, CH4 emis-sions from wetlands are believed to offset the positive benefits of terrestrial carbon sequestration in soils and plants. Therefore, proper management of wetlands is important to mitigate global warming. In our research, we investigated the current status and the controlling factors related to increased CH4 emissions from wetlands, particularly wetlands in past-mining areas. In addition, we conducted laboratory studies of arsenic dynamics with a focus on the oxidation/reduction and methylation/demethylation of arsenic in a simulated wetland system. The results obtained thus far show that environ-mental conditions such as the temperature and characteristics of organic carbon in the wetlands may affect CH4 fluxes and arsenic reactions in wetlands and that these processes are closely linked to microbial activities.
Fig. 1. Selected wetland locations and calculated CH4 fluxes at several study sites.
Fig. 2. Multiphase investigations of the arsenic distribution in wetland microcosms.