Japan Geoscience Union Meeting 2016

Presentation information


Symbol A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG22] Material Circulations in Land Ecosystems

Wed. May 25, 2016 9:00 AM - 10:30 AM 101B (1F)

Convener:*Tomomichi Kato(Research Faculty of Agriculture, Hokkaido University), Takashi Hirano(Research Faculty of Agriculture, Hokkaido University), Hisashi Sato(Department of Environmental Geochemical Cycle Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)), Ryuichi Hirata(National Institute for Environmental Studies), Chair:Takashi Hirano(Research Faculty of Agriculture, Hokkaido University)

9:15 AM - 9:30 AM

[ACG22-02] CH4 Flux of Asian Terrestrial Ecosystems Based on a Soil Respiration Chamber Network

*Naishen Liang1, Munemasa Teramoto1, Jiye Zeng1, Jin-sheng He2, C.D. Fletcher3 (1.Center for Global Environmental Research (CGER), National Institute for Environmental Studies (NIES), 2.Peking University, 3.Forest Research Institute Malaysia)

Keywords:Chamber network, CH4 flux, Larch forest, Tibet Plateau wetland, Tropical rainforest

Methane (CH4) is the second important greenhouse gas (GHG) after carbon dioxide (CO2), because CH4 has a relative global warming potential 28-36 times of CO2 at a 100-yr time horizon. Moreover, atmospheric CH4 concentration has doubled since 1800 and contributes about 20% to the global radiative forcing. Recently, a process-based coupled biogeochemical model estimated that CH4 emission from global terrestrial ecosystems was 144.39±12.90 Tg C/yr with an increasing rate of 0.43±0.06 Tg C/yr between 1981 and 2010 (Tian et al. 2015). The dominant sources of CH4 are nature wetlands and rice fields.
Asian wetlands occupy vast areas from tropical peat swamp forests in Southeast Asia to boreal marsh in Northeast Asia, and as well as alpine meadow on the Tibet Plateau. Furthermore, Monsoon Asia is the largest rice-producing area. The countries of this region together produce 90% of the global output of rice. Thus, Asia plays an important role in the regional exchange of CH4 between terrestrial ecosystems and the atmosphere. However, currently Monsoon Asia is under various pressures such as land-use and climate changes. Quantifying CH4 balance is helpful for understanding their response and feedback to the changing world, and simultaneously is critical for setting targets for GHGs (e.g. CO2, CH4, N2O) emission reductions and to identify and promote mitigation strategies. This talk will present CO2/CH4 fluxes and their controls of a meadow peatland on Tibet Plateau, a larch forest in central Japan, and a tropical rainforest in the Peninsular Malaysia by using multichannel automated chamber systems.