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http://dx.doi.org/10.11626/KJEB.2018.36.4.507

Comparison of CH4 Emission by Open-path and Closed Chamber Methods in the Paddy Rice Fields  

Jeong, Hyun-cheol (National Institute of Agricultural Sciences, RDA)
Choi, Eun-jung (National Institute of Agricultural Sciences, RDA)
Kim, Gun-yeob (National Institute of Agricultural Sciences, RDA)
Lee, Sun-il (National Institute of Agricultural Sciences, RDA)
Lee, Jong-sik (National Institute of Agricultural Sciences, RDA)
Publication Information
Korean Journal of Environmental Biology / v.36, no.4, 2018 , pp. 507-516 More about this Journal
Abstract
The closed chamber method, which is one of the most commonly used method for measuring greenhouse gases produced in rice paddy fields, has limitations in measuring dynamic $CH_4$ flux with spatio-temporal constrains. In order to deal with the limitation of the closed chamber method, some studies based on open-path of eddy covariance method have been actively conducted recently. The aim of this study was to compare the $CH_4$ fluxes measured by open-path and closed chamber method in the paddy rice fields. The open-path, one of the gas ($CO_2$, $CH_4$ etc.) analysis methods, is technology where a laser beam is emitted from the source passes through the open cell, reflecting multiple times from the two mirrors, and then detecting. The $CH_4$ emission patterns by these two methods during rice cultivation season were similar, but the total $CH_4$ emission measured by open-path method were 31% less than of the amount measured by closed chamber. The reason for the difference in $CH_4$ emission was due to overestimation by closed chamber and underestimation by open-path. The closed chamber method can overestimate $CH_4$ emissions due to environmental changes caused by high temperature and light interruption by acrylic partition in chamber. On the other hand, the open-path method for eddy covariance can underestimate its emission because it assumes density fluctuations and horizontal homogeneous terrain negligible However, comparing $CH_4$ fluxes at the same sampling time (AM 10:30-11:00, 30-min fluxes) showed good agreements ($r^2=0.9064$). The open-path measurement technique is expected to be a good way to compensate for the disadvantage of the closed chamber method because it can monitor dynamic $CH_4$ fluctuation even if data loss is taken into account.
Keywords
methane ($CH_4$); open-path; chamber; eddy covariance; paddy rice;
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