Methane emission from flooded rice fields under irrigated conditions

Adhya, T. K.; Rath, Arun Kumar; Gupta, Prabhat K.; Rao, V. R.; Das, Subir K.; Parida, K. M.; Parashar, D. C.; Sethunathan, N.

doi:10.1007/bf00647675

Cited by 124 publications

(47 citation statements)

References 9 publications

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“…Our study demonstrates a strong inhibition of dry/wet alternation on CH 4 production and emission, similar to findings observed in previous studies (2,23,37,39,44,50). To obtain a mechanistic understanding of the drainage effect, we analyzed soil biogeochemistry, as well as the abundance and composition of methanogenic community, in the samples from four soil compartments.…”

Section: Discussionsupporting

confidence: 87%

Responses of MethanogenmcrAGenes and Their Transcripts to an Alternate Dry/Wet Cycle of Paddy Field Soil

Conrad

2012

Appl Environ Microbiol

146

105

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Intermittent drainage can substantially reduce methane emission from rice fields, but the microbial mechanisms remain poorly understood. In the present study, we determined the rates of methane production and emission, the dynamics of ferric iron and sulfate, and the abundance of methanogen mcrA genes (encoding the alpha subunit of methyl coenzyme M reductase) and their transcripts in response to alternate dry/wet cycles in paddy field soil. We found that intermittent drainage did not affect the growth of rice plants but significantly reduced the rates of both methane production and emission. The dry/wet cycles also resulted in shifts of soil redox conditions, increasing the concentrations of ferric iron and sulfate in the soil. Quantitative PCR analysis revealed that both mcrA gene copies and mcrA transcripts significantly decreased after dry/wet alternation compared to continuous flooding. Correlation and regression analyses showed that the abundance of mcrA genes and transcripts positively correlated with methane production potential and soil water content and negatively correlated with the concentrations of ferric iron and sulfate in the soil. However, the transcription of mcrA genes was reduced to a greater extent than the abundance of mcrA genes, resulting in very low mcrA transcript/gene ratios after intermittent drainage. Furthermore, terminal restriction fragment length polymorphism analysis revealed that the composition of methanogenic community remained stable under dry/ wet cycles, whereas that of metabolically active methanogens strongly changed. Collectively, our study demonstrated a stronger effect of intermittent drainage on the abundance of mcrA transcripts than of mcrA genes in rice field soil.

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Section: Discussionsupporting

confidence: 87%

Responses of MethanogenmcrAGenes and Their Transcripts to an Alternate Dry/Wet Cycle of Paddy Field Soil

Conrad

2012

Appl Environ Microbiol

146

105

View full text Add to dashboard Cite

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“…The removal of paddy field water for 30 days significantly reduced CH 4 -C emission (54-58 %), which is consistent with the findings of Kim et al (2014); Itoh et al (2011);Ma and Lu (2011);Hadi et al (2010);Sass et al (1992); Yagi et al (1996); Adhya et al (1994). They reported 43-58 % reduction of CH 4 emission through intermittent drainage.…”

Section: Discussionsupporting

confidence: 89%

Intermittent drainage in paddy soil: ecosystem carbon budget and global warming potential

Haque

Biswas

Kim

et al. 2016

Paddy Water Environ

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Intermittent drainage of rice fields alters soil redox potential and contributes to the reduction of CH 4 emission and thus may reduce net global warming potential (GWP) during rice cultivation. Incorporation of green biomass helps maintaining soil organic matter, but may increase CH 4 emission. We investigated net ecosystem carbon budget (NECB) and net GWP under two water management regimes-continuous flooding and intermittent drainage-having four biomass incorporation levels (0, 3, 6 and 12 Mg ha -1 ). Water management and biomass incorporation level demonstrated significant (P \ 0.05) interaction effect on the NECB and GWP. Intermittent drainage decreased the NECB by ca. 6-46 % than continuous flooding under same rates of cover crop biomass (CCB) incorporation. Moreover, intermittent drainage reduced seasonal CH 4 -C fluxes by ca. 54-58 % and net GWP by 35-58 % compared to continuous flooding. There was also no significant reduction in rice yield because of intermittent drainage under similar CCB. This implies that incorporation of 3 Mg ha -1 CCB and intermittent drainage could be a good option for reducing net GWP and higher grain yield.

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“…The physiology of rice plants regulates methane emissions by making available sources of methanogenic substrates through carbon in the roots, including exudates, and also by transporting CH 4 emissions through the aerenchyma [11,[31][32][33][34]. Several studies have confirmed variations in the emission levels of different rice cultivars [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39].…”

Section: Rice Cultivar (Variety) Impact On Ghg Emissionsmentioning

confidence: 99%

Rice Cultivation and Greenhouse Gas Emissions: A Review and Conceptual Framework with Reference to Ghana

2017

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Abstract:Rice is an essential crop in Ghana. Several aspects of rice have been studied to increase its production; however, the environmental aspects, including impact on climate change, have not been studied well. There is therefore a gap in knowledge, and hence the need for continuous research. By accessing academic portals, such as Springer Open, InTech Open, Elsevier, and the Kwame Nkrumah University of Science and Technology's offline campus library, 61 academic publications including peer reviewed journals, books, working papers, reports, etc. were critically reviewed. It was found that there is a lack of data on how paddy rice production systems affect greenhouse gas (GHG) emissions, particularly emissions estimation, geographical location, and crops. Regarding GHG emission estimation, the review identified the use of emission factors calibrated using temperate conditions which do not suit tropical conditions. On location, most research on rice GHG emissions have been carried out in Asia with little input from Africa. In regard to crops, there is paucity of in-situ emissions data from paddy fields in Ghana. Drawing on the review, a conceptual framework is developed using Ghana as reference point to guide the discussion on fertilizer application, water management rice cultivars, and soil for future development of adaptation strategies for rice emission reduction.

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Methane emission from flooded rice fields under irrigated conditions

Cited by 124 publications

References 9 publications

Responses of MethanogenmcrAGenes and Their Transcripts to an Alternate Dry/Wet Cycle of Paddy Field Soil

Responses of MethanogenmcrAGenes and Their Transcripts to an Alternate Dry/Wet Cycle of Paddy Field Soil

Intermittent drainage in paddy soil: ecosystem carbon budget and global warming potential

Rice Cultivation and Greenhouse Gas Emissions: A Review and Conceptual Framework with Reference to Ghana

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