Preliminary estimated flux of the CO2 and CH4 in Chiku wetland in Taiwan

Cooperating with Taiwan Central Weather Bureau and Ministry of Science and Technology, the measurements of carbon dioxide and methane fluxes were conducted in Chiku wetland in Taiwan. In this study, we use eddy covariance system (EC) to observe carbon dioxide and methane fluxes with seasonal variation. The fluxes data can be presented as a function of temperature by fitting technology. Moreover, a module with resistance concept was developed to depict the CO₂ and CH₄ emission.

Results showed that carbon dioxide fluxes were -0.8 mg m^-2 s^-1 and 0.4 mg m^-2 s^-1 attribute to photosynthesis and respiration during the daytime and nighttime, respectively. In addition, the methane fluxes were -1.5 μg m^-2 s^-1 and 1.5 μg m^-2 s^-1 due to the methane oxidation and methanogenesis during the daytime and nighttime, respectively. Furthermore, higher temperature and strong photosynthetically active radiation in summer made more assimilation of carbon dioxide and methane than in spring and fall. As a result, the emission of carbon dioxide and methane were estimated about -271 Gg CO₂ yr^-1 and -372 Mg CH₄ yr^-1 in Chiku wetland.