Late growing season CH4 budget in a rice paddy determined using stable carbon isotope, emission flux and soil storage measurements

Han, Gwang Hyun; Yoshikoshi, Hisashi; Nagai, Hideyuki; Yamada, Tadao; Saito, Makoto; Miyata, Akira; Harazono, Yoshinobu

doi:10.1016/j.orggeochem.2005.01.004

Cited by 13 publications

(6 citation statements)

References 40 publications

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“…It drastically increased 1 day after the drainage, which is mainly ascribed to the influence of CH 4 oxidation. It is expected that draining of the rice field results in 13 C enrichment [ Tyler et al , 1994; Bergamaschi , 1997; Marik et al , 2002; Han et al , 2005; Rao et al , 2008] because of increased activity of methanotrophs both in and around the rhizosphere. Two days later, a significant decrease in δ 13 C value of emitted CH 4 was observed.…”

Section: Discussionmentioning

confidence: 99%

Carbon isotopic composition, methanogenic pathway, and fraction of CH₄oxidized in a rice field flooded year-round

Zhang¹,

Zhang²,

Yang³

et al. 2011

J. Geophys. Res.

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[1] Values of d 13 C were investigated of CH 4 trapped in the soil pore water and floodwater of and emitted from a rice field under continuous flooding throughout the fallow and following rice seasons, and CH 4 produced via different pathways and fraction of CH 4 oxidized was calculated by using the isotopic data. Pore water CH 4 was relatively 13 C depleted, with d13 C values about −65‰ over the season except between July and August (around −55‰). Also, hydrogenotrophic methanogenesis was very important (around 50%) for most of the season, while acetoclastic methanogenesis dominated (about 70%) only between July and August. Floodwater CH 4 was heavier in d 13 C value (from −50‰ to −34‰) than pore water CH 4 (from −68‰ to −54‰) over the season, demonstrating that it is highly influenced by methanotrophy. The d 13 C value of emitted CH 4 was negatively correlated with flux in temporal variation (P <0.05), and it was more positive in the fallow season (between −56‰ and −44‰) than in the rice season (between −68‰ and −48‰). This indicates that plant-mediated CH 4 transport is probably a more important pathway and causes less CH 4 oxidation during the rice season than during the fallow season, which is further confirmed by the fraction of CH 4 oxidized being generally greater in the fallow season (60%-90%) than in the rice season (10%-80%). These findings suggest a low contribution of acetoclastic methanogenesis and a high fraction of CH 4 being oxidized in the field, especially in the fallow season.

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Section: Discussionmentioning

confidence: 99%

Carbon isotopic composition, methanogenic pathway, and fraction of CH₄oxidized in a rice field flooded year-round

Zhang¹,

Zhang²,

Yang³

et al. 2011

J. Geophys. Res.

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“…Rice grains were harvested on 19 September, leaving rice stubble and straw in the field. This site is a member of the AsiaFlux network, and more extensive site details can be found in Saito et al [2005] and Han et al [2005].…”

Section: Methodsmentioning

confidence: 99%

Isotopic disequilibrium between carbon assimilated and respired in a rice paddy as influenced by methanogenesis from CO₂

Han¹,

Yoshikoshi²,

Nagai³

et al. 2007

J. Geophys. Res.

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[1] Temporal variability in the carbon isotope composition of ecosystem respiration (d R ) has been closely related to environmental variables that influence photosynthetic isotope discrimination (D). We show that belowground methanogenesis has a strong impact on d R and leads to a partial decoupling between d R and D. The d R , observed in a Japanese rice paddy, varied from À26.3% to À22.8% over the growing season in 2003 and was consistently more positive (by 2%À5%) than leaf bulk d 13 C (d P ). Interestingly, d R increased by 1.1%-3.1% upon drainage, consistent with increased methane and nighttime CO 2 fluxes. As the season progressed, d 13 C of soil CO 2 (d S ) was gradually enriched in 13 C, from À23.2% to À16.6%, reflecting a large isotopic fractionation associated with CO 2 -dependent methanogenesis. Correlation analyses between d R and driving factors showed that ecosystem factors related to methanogenesis had shorter lags and better correlation with d R than environmental variables that influence photosynthesis. Given the distinct isotopic differences between d R and its above-and belowground components (d P and d S , respectively), we partitioned ecosystem respiration into plant and soil respiration assuming negligible fractionation in respiration and CO 2 transport. The estimated proportion of soil respiration varied from 20% to 50% of the ecosystem respiration depending on vegetation stage, temperature, and flooding/drainage conditions. We found a good agreement between net primary production obtained by field sampling and that estimated from the inferred soil respiration and measured CO 2 fluxes. We also performed a sensitivity analysis to constrain the probable range of isotopic fractionations in respiration and CO 2 transport.Citation: Han, G. H., H. Yoshikoshi, H. Nagai, T. Yamada, K. Ono, M. Mano, and A. Miyata (2007), Isotopic disequilibrium between carbon assimilated and respired in a rice paddy as influenced by methanogenesis from CO 2 ,

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“…E diffusion is given by Han et al, 2005Han et al, , 2007 . Atmospheric methane concentration was measured at 2.5-min intervals using a flame ionization detector gas analyzer FIA-510/APHA-360, Horiba, Kyoto, Japan , and aggregated to 10-min mean profiles.…”

Section: Oxidationmentioning

confidence: 99%

“…A paddy field is a greenhouse gas source in global warming, and especially plays a role of methane source IPCC AR4, 2007 . Methane is produced by the anaerobic soil during the irrigation period Aulakh et al, 2001;Han et al, 2005;Nishimura et al, 2008 , and emitted to the atmosphere via a rice plant and paddy water Butterbach-Bahl et al, 1997;Jia et al, 2001 . The methane emission from paddy fields accounts for 27 of the whole anthropogenic methane emission in the world Yusuf et al, 2012 .…”

Section: Introductionmentioning

confidence: 99%

Estimation of methane emission from rice paddy soils in Japan using the diagnostic ecosystem model

Sasai

Nakai²,

Ono

et al. 2017

J. Agric. Meteorol.

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AbstactIt is needed to accurately evaluate the methane emission from paddy fi elds at a national scale for both scientifi c and political purposes. The existing approaches have shared a common issue with obtaining the realistic information on spatiotemporal variations of crop management. Satellite sensor could possibly detect them, but the methodology to link the satellite observations to the methane emission has not been established. In this study, we enhanced the existing diagnostic satellite-driven paddy ecosystem model, the Biosphere model integrating Eco-physiological And Mechanistic approaches using satellite data for regional Cropland BEAMS-C Sasai et al., 2012 , by integrating the methane processes and examined the potential of this approach by comparing the estimated nation-wide methane emission with that by the existing approaches. The carbon fl ux estimations had good agreements with the measurements at the Mase paddy fl ux site. In regional-scale analyses in Japan, methane emission averaged from 2001 to 2010 was 15.0 gC m -2 year -1 , which was similar to the Tire-1 and -2 results. If we have a continuing improvement of the diagnostic approach, it could be one of the most effi cient tools for estimating the methane fl ux at national scales.

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Late growing season CH4 budget in a rice paddy determined using stable carbon isotope, emission flux and soil storage measurements

Cited by 13 publications

References 40 publications

Carbon isotopic composition, methanogenic pathway, and fraction of CH₄oxidized in a rice field flooded year-round

Carbon isotopic composition, methanogenic pathway, and fraction of CH₄oxidized in a rice field flooded year-round

Isotopic disequilibrium between carbon assimilated and respired in a rice paddy as influenced by methanogenesis from CO₂

Estimation of methane emission from rice paddy soils in Japan using the diagnostic ecosystem model

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Late growing season CH4 budget in a rice paddy determined using stable carbon isotope, emission flux and soil storage measurements

Cited by 13 publications

References 40 publications

Carbon isotopic composition, methanogenic pathway, and fraction of CH4oxidized in a rice field flooded year-round

Carbon isotopic composition, methanogenic pathway, and fraction of CH4oxidized in a rice field flooded year-round

Isotopic disequilibrium between carbon assimilated and respired in a rice paddy as influenced by methanogenesis from CO2

Estimation of methane emission from rice paddy soils in Japan using the diagnostic ecosystem model

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Product

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Carbon isotopic composition, methanogenic pathway, and fraction of CH₄oxidized in a rice field flooded year-round

Carbon isotopic composition, methanogenic pathway, and fraction of CH₄oxidized in a rice field flooded year-round

Isotopic disequilibrium between carbon assimilated and respired in a rice paddy as influenced by methanogenesis from CO₂