*Shinjiro Ohkubo¹, Takashi Hirano¹, Ryuichi Hirata², Angela Tang³, Frankie Kiew³, Joseph Wenceslaus³, Edward Baran Aeries³, Lulie Melling³ (1.Research Faculty of Agriculture, Hokkaido University, 2.CGER, National Institute for Environmental Studies, 3.Sarawak Tropical Peat Research Institute)