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B-6.1.2Modeling and Prediction of Carbon Dioxide Change Mechanism on Tropical Forest Ecosystems

[Contact Person]

Naruo Matsumoto
Environmental Resources Division,
Japan International Research Center for Agricultural Sciences
Ministry of Agriculture, Forestry and Fisheries
1-2 Ohwashi, Tsukuba, Ibaraki 305-8686, Japan
Phone: +81-298-38-6355 Fax: +81-298-38-6651
e-mail: matsunar@jircas.affrc.go.jp

Total Budget for FY1996-FY1998

6,957,000 Yen

Abstract

Carbon cycle in a tropical forest in Khon Kaen, the northeast Thailand was measured. Carbon transfer rate was estimated 5.1 tC/ha/yr on litter-fall, 4.1 tC/ha/yr from litter to soil, 0.2 tC/ha/yr from fine root to soil, and 5.5 tC/ha/yr on decomposition of soil organic matter. The soil had 41.4 tC/ha as organic matter, and was estimated to decrease 0.8 tC/ha/yr annually. Decomposition rate of organic matter was rapid than organic matter supply such as litter-fall, then soil had low amount of carbon. Under the climate change, it is expected that carbon accumulation rate in tropical forest ecosystem will not change so much.

[Key Words]

Carbon cycle, Model, Tropical monsoon forest, Thailand