Chiang Mai Journal of Science

It is crucial to understand the effect of rainfall on soil CO₂  efflux and the factors that control efflux. This paper investigates the influence of rainfall events on soil CO₂ efflux from wheat and peanut fields by using high-frequency soil gradient efflux method and long term automated soil chamber measurements. Results show soil CO₂ efflux decreased during and immediately after rainfall events, which was related to reduce gaseous diffusivity as a response. A few hours after rainfall, a significant increase in soil CO₂ emissions to adequately model carbon-water cycling from agricultural soils to the atmosphere.