[A-CG30] Material circulations in Terrestrial Ecosystem: Water, Carbon and Nitrogen etc.

[ACG30-04] Control of Soil Carbon Dynamic of Southeast Asian Ecosystems

*Naishen LIANG¹, Munemasa TERAMOTO¹, Zhenghong TANG², Christine D. Fletcher³ (1.NIES, 2.XTBG, 3.FRIM)

Keywords:Automated chamber, LULUC, moisture, soil carbon, tropical ecosystem

The tropical ecosystems have been estimated to be a large carbon source (1.3 Pg C yr^-1) due to deforestation and forest degradation, even the global terrestrial carbon sink has been large (1.1 Pg C yr^-1) in recent decades. Reducing Emissions from Deforestation and Forest Degradation (REDD) is an effort to create a financial value for the carbon stored in forests, offering incentives for tropical region to reduce emissions from forested lands and invest in low-carbon paths to sustainable development. The ultimate goal of this study is to update REDD mechanism through improved forest management by evaluation of effects of logging and land-use change on soil carbon emission of tropical forests. This study was conducted in a lowland primary forest at Pasoh Forest Reserve (2^o58'N, 102^o18'E; 75~150m a.s.l.) and a mountainous tropical forests at Temenggor concession area (5^o33'N, 101^o36'E; 800~900m a.s.l.) in Peninsular Malaysia. About 50~65% biomass was harvested and soil temperature increased about 3oC with SMS, resulting value of the carbon stock lost about 2,577 US$ ha^-1 following the first year of logging. On the other hand, under low-impact harvest condition, only about 1,773 US$ ha^-1 was lost following the first year of logging. Result suggests that this low-impact harvest system would achieve about 804 US$ ha^-1 of REDD credit partially contributed from mitigating soil degradation of about 169 US$ ha^-1.