In a global carbon store, tropical peat swamp forests in Southeast Asia play an important role in future global climate change. Tropical peatlands store a huge amount of carbon in belowground ecosystem as peat soil. Conversion of peatswamp forest to oil palm plantation shifts the function of the natural state of forest from carbon sink to carbon source (Hergoualc’h & Verchot 2013). The rate of peatswamp forest deforestation in Indonesia has been higher (1.5-2.2% per year) than that of other forest types during 2000-2010 (Miettinen et al. 2012b), which mainly due to establishment of oil palm plantation on peat. Consequently, the conversion of primary peat swamp forests to oil palm plantations is believed to increase emissions of GHG especially CO2 emission into the atmosphere.