Comparison of Carbon Dioxide (CO 2 ) Fluxes between Conventional and Conserved Irrigated Rice Paddy Fields in Myanmar

Saw Min and Martin Rulík
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Saw Min: Department of Ecology and Environmental Sciences, Faculty of Science, Palacký University Olomouc, CZ-78371 Olomouc, Czech Republic
Martin Rulík: Department of Ecology and Environmental Sciences, Faculty of Science, Palacký University Olomouc, CZ-78371 Olomouc, Czech Republic

Sustainability, 2020, vol. 12, issue 14, 1-19

Abstract: Rice ( Oryza sativa . L.), a major food crop widely grown in Myanmar, is the most prominent cause of greenhouse gas (GHG) emissions in agriculture. Moreover, as a result of modification in agricultural management practices (such as soil tillage), the soil organic matter is exposed to more oxidizing conditions, releasing CO 2 into the environment, contributing to global warming. Therefore, we studied the effects of both conventional and conservation soil tillage management practices on CO 2 fluxes on an experimental rice paddy field in Myanmar. Total CO 2 emissions during the night from paddies farmed under conventional practices were significantly higher than those from paddies farmed under conservation practices; however, no net CO 2 flux differences were found between practices. Total net CO 2 fluxes ranged from −59 to 1614 mg CO 2 m −2 h −1 in conventional practices and from −282 to 1082 mg CO 2 m −2 h −1 in conservation practices, respectively. Significantly higher rice biomass and grain yields were observed in conventional practices when compared to those in conservation practices, causing a significant rise in both CO 2 uptake and emissions during the day and night, respectively. In addition, the results of this study revealed that CO 2 emissions in rice fields could be much higher than expected, requiring further study to elucidate key factors driving the dynamics of CO 2 in rice paddy systems.

Keywords: CO 2 emission; conventional; conservation; grain yields; rice paddy (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
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