Effects of Land-Use Change in Tropical Peat Soil on the Microbial Population and Emission of Greenhouse Gases

抄録

Effects of land-use change in tropical peatlands on the microbial population and emissions of nitrous oxide (N₂O), methane (CH₄) and carbon dioxide (CO₂) were studied in the field and laboratory. The study area covered secondary forest, paddy field and paddy-soybean rotation field in Indonesia. ATP content, and numbers of viable bacteria and fungi, cellulolytic bacteria and fungi, NH₄+ oxidizers and denitrifiers in a paddy-soybean rotation field and paddy field were reduced to 1-30% and 3-90% of those in secondary forest, respectively. The field measurements of greenhouse gas emissions showed that significantly more CH₄ was emitted from paddy field than secondary forest, but no significant difference in the emission of either N₂O or CO₂. The laboratory incubation experiment showed that the soil moisture level and land-use change significantly affected the emission of N₂O, CH₄ and CO₂. These results suggested that land-use change significantly affected the microbial population and emissions of greenhouse gases.