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Determination of appropriate measurement timing of soil CO2 emission in dry dipterocarp forest, western Thailand |
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| รหัสดีโอไอ | |
| Title | Determination of appropriate measurement timing of soil CO2 emission in dry dipterocarp forest, western Thailand |
| Creator | 1. Apaporn Bulsathaporn 2. Amnat Chidthaisong |
| Publisher | Joint Graduate School of Energy and Environment |
| Publication Year | 2557 |
| Keyword | Soil CO2 Efflux, Soil Respiration, Soil CO2 Sensor, CO2 Gradient Method, Diurnal Variation |
| Abstract | Emission of CO2 from soil surface varies in time and space, depending on various environmental factors. This study aims to determine the appropriate timing that reflects the daily average value of soil CO2 emission in dry dipterocarp forest. Soil CO2 emission was measured by sensors that allow high time resolution (every 15 seconds) of gas sampling and concentration determination. It was found that mean of daily soil CO2 efflux rates were 1.63 ? 0.02 ?mol m-2 s-1. Measurement timing between 11.30 and 13.30 (Thailand Time) is recommended as best time to reflect this daily mean value. The measurements in this period had 0.75% deviation from the mean value (n=480). With this high resolution data, it was also revealed that precipitation events differently affect the amount of measured soil CO2 fluxes between closed chamber and sensor methods. During rain events, lower CO2 emission was detected by sensor method when compared to that of the closed chamber method. |
| ISBN | 978-616-92228-1-1 |
