INTERNATIONAL ENERGY JOURNAL

Volume 21, No. 03, Month SEPTEMBER, Year 2021, Pages 339 - 346

Seasonal estimates of methane emissions from natural wetlands in nakhon ratchasima, thailand

Preecha Panmoon, Nares Chuersuwan

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Seasonal methane emissions from natural wetlands in Nakhon Ratchasima province were estimated based on 12-month field works obtained from the actual methane flux measurements at a natural wetland. Methane gas was measured monthly with a static closed chamber technique and later analyzed by a gas chromatography equipped with a flame ionization detector (GC-FID). Results showed that methane fluxes varied widely in the range of 1.9-22.7 mg m-2day-1 with the median ± SD of 10.1 ± 5.4 mg m-2day-1 . Seasonally, the methane fluxes during wet season ranged from 5.2 to 22.7 mg m-2day-1 with the median ± SD of 14.1 ± 5.0 mg m-2day-1 while the methane fluxes during dry season were between 1.9 and 21.9 mg m-2day-1 with the median ± SD of 8.8 ± 5.2 mg m-2day-1 .The estimate methane fluxes of the wetland in wet and dry seasons were 1.5-3.1 kg m-2 and 0.7-2.9 kg m-2 , respectively. The estimated methane emission factor from the natural wetland in the province was 1.7 to 5.7 kg m-2 year-1 compared to the default methane emission factor from IPCC, 0.0136 kg m-2 year-1 .When considering global warming potential (GWP) of methane based on 100-year time horizon, the natural wetlands in the province may emit about 15.48 to 52.16 million ton CO2equivalent a year based on the emission factor derived locally. With the IPCC default emission factor, the methane emission was as low as 0.03 to 0.22 million ton CO2equivalent a year.

Keywords

Greenhouse gas, Methane emission, Nakhon Ratchasima, Thailand, Natural wetland

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