Methane Emission in a Small-Scale Rice Field under Two Different Water Management Strategies – An Insight for Landscape Level Adjustments

• Autorzy: Bunquin Michelle Anne B. , Bugia Sophia Alelie Cotoner , Buladaco II Marcial S. , Rocamora Patrick M.

Identyfikatory

DOI

10.12912/27197050/192593

• Języki publikacji: EN

Abstrakty

EN

The main purpose of this study was to optimize the methods for determining methane emission in a continuously flooded (CF) and an alternately wetted and dried rice system. A field experiment was conducted at Block B1, Pili Drive, Los Baños, Laguna for one cropping season to evaluate the CH₄ emission in both FP and AWD treatment plots. Fertilizer application rates were similar across treatments and were based on the recommended rate. Gas sampling was done weekly at 0, 15, and 30 – minute intervals and gas samples were analyzed using a gas chromatograph equipped with a flame-ionization detector (FID). Results showed that FP plots emitted methane at 15.07 to 459.14 mg CH₄ day^-1 m^-2, which was higher than those produced in AWD plots which ranged from 1.68 to 36.26 mg CH₄ day^-1 m^-2 throughout the cropping period. In both treatments, a decreasing trend in methane emission was observed which was attributed to the depleting carbon source of methanotrophs where methane was utilized rather than produced at an unfavorable redox potential for methane production. Global warming potential (GWP) of 7.000 kg CO₂ -eq and 1.350 kg CO₂ -eq was contributed by FP and AWD treatments, respectively. Overall, CH₄ emission was reduced by 80–85% when AWD was employed without having a yield compromise. The result of this pilot study is limited to a 1.300 m² field area but it showed a significant comparison between the two water management strategies in rice systems. Also, the learnings in this study will be used further for landscape greenhouse gas measurements in major rice-producing areas in the Philippines and ultimately will contribute to the carbon footprint assessment of rice cultivation.

Słowa kluczowe

EN

AWD; rice production; global warming; methane; greenhouse gas; carbon footprint

• Wydawca: Lubelski Oddział Polskiego Towarzystwo Inżynierii Ekologicznej ; Lublin University of Technology ; WNGB Wydawnictwo Naukowe
• Czasopismo: Ecological Engineering & Environmental Technology
• Rocznik: 2024
• Tom: Vol. 25, iss. 11
• Strony: 218--227
• Opis fizyczny: Bibliogr. 30 poz., rys., tab.

Twórcy

autor

Bunquin Michelle Anne B.

• Division of Soil Science, Agricultural Systems Institute, College of Agriculture and Food Science, University of the Philippines Los Baños, College, Laguna, Philippines

• https://orcid.org/0000-0001-8395-6232

autor

Bugia Sophia Alelie Cotoner

• Division of Soil Science, Agricultural Systems Institute, College of Agriculture and Food Science, University of the Philippines Los Baños, College, Laguna, Philippines

• https://orcid.org/0009-0003-8945-5270

autor

Buladaco II Marcial S.

• Division of Soil Science, Agricultural Systems Institute, College of Agriculture and Food Science, University of the Philippines Los Baños, College, Laguna, Philippines

• https://orcid.org/0000-0003-2386-9924

autor

Rocamora Patrick M.

• Division of Soil Science, Agricultural Systems Institute, College of Agriculture and Food Science, University of the Philippines Los Baños, College, Laguna, Philippines

• https://orcid.org/0009-0001-1348-1080

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