Seasonal Estimates of Methane Emissions from Natural Wetlands in Nakhon Ratchasima, Thailand

Preecha Panmoon, Nares Chuersuwan


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-2year-1 compared to the default methane emission factor from IPCC, 0.0136 kg m-2year-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 yearbased 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.


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

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