Variations of Stable Carbon Isotopes of CH4 Emission from Three Typical Rice Fields in China

Zhang, Guangbin; Ma, Jing; Yang, Yuting; Yu, Haiyang; Shi, Ye; Xu, Hong‐Guang

doi:10.1016/s1002-0160(15)60096-0

Cited by 17 publications

(30 citation statements)

References 32 publications

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“…Mulching cultivation leads to higher values of 13 C compared to traditional cultivation, and to lower CH 4 total emissions (Zhang et al, 2017). In this study, we used a global uniform value of -62.1 ‰ for RICE emissions, but measured values vary between approximately -45 ‰ and -65 ‰ at three different rice fields in China (Zhang et al, 2017). The seasonality of 13 C is determined by cultivation method, tillage and Nitrogen (N) fertilization, but is also controlled by drainage.…”

Section: Isotope Signaturesmentioning

confidence: 99%

“…Rice cultivation methods also affect the source signatures. Mulching cultivation leads to higher values of 13 C compared to traditional cultivation, and to lower CH 4 total emissions (Zhang et al, 2017). In this study, we used a global uniform value of -62.1 ‰ for RICE emissions, but measured values vary between approximately -45 ‰ and -65 ‰ at three different rice fields in China (Zhang et al, 2017).…”

Section: Isotope Signaturesmentioning

confidence: 99%

“…The seasonality of 13 C is determined by cultivation method, tillage and Nitrogen (N) fertilization, but is also controlled by drainage. For instance, permanently flooded rice fields have enriched 13 C values at the beginning of the crop season followed by a rapid depletion in 13 CH 4 and towards end of the season 13 C values become enriched again (Zhang et al, 2017). In double harvest fields, the 13 CH 4 values are depleted immediately after drainage (Zhang et al, 2017).…”

Section: Isotope Signaturesmentioning

confidence: 99%

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Role of emission sources and atmospheric sink on the seasonal cycle of CH4 and δ13-CH4: analysis based on the atmospheric chemistry transport model TM5

Kangasaho

Tsuruta

Backman

et al. 2021

Preprint

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Abstract. This study investigates the contribution of different CH4 sources to the seasonal cycle of 𝛿13C during years 2000–2012 using the TM5 atmospheric transport model. The seasonal cycles of anthropogenic emissions from two versions of the EDGAR inventories, v4.3.2 and v5.0 are examined. Those includes emissions from Enteric Fermentation and Manure Management (EFMM), rice cultivation and residential sources. Those from wetlands obtained from LPX-Bern v1.4 are also examined in addition to other sources such as fires and ocean sources. We use spatially varying isotopic source signatures for EFMM, coal, oil and gas, wetlands, fires and geological emission and for other sources a global uniform value. We analysed the results as zonal means for 30° latitudinal bands. Seasonal cycles of 𝛿13C are found to be an inverse of CH4 cycles in general, with a peak-to-peak amplitude of 0.07–0.26 ‰. However, due to emissions, the phase ellipses do not form straight lines, and the anti-correlations between CH4 and 𝛿13C are weaker (−0.35 to −0.91) in north of 30° S. We found that wetland emissions are the dominant driver in the 𝛿13C seasonal cycle in the Northern Hemisphere and Tropics, such that the timing of 𝛿13C seasonal minimum is shifted by ∼90 days in 60° N–90° N from the end of the year to the beginning of the year when seasonality of wetland emissions is removed. The results also showed that in the Southern Hemisphere Tropics, emissions from fires contribute to the enrichment of 𝛿13C in July–October. In addition, we also compared the results against observations from the South Pole, Antarctica, Alert, Nunavut, Canada and Niwot Ridge, Colorado, USA. In light of this research, comparison to the observation showed that the seasonal cycle of EFMM emissions in EDGAR v5.0 inventory is more realistic than in v4.3.2. In addition, the comparison at Alert showed that modelled 𝛿13C amplitude was approximately half of the observations, mainly because the model could not reproduce the strong depletion in autumn. This indicates that CH4 emission magnitude and seasonal cycle of wetlands may need to be revised. Results from Niwot Ridge indicate that in addition to biogenic emissions, the proportion of biogenic to fossil based emissions may need to be revised.

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Section: Isotope Signaturesmentioning

confidence: 99%

Section: Isotope Signaturesmentioning

confidence: 99%

Section: Isotope Signaturesmentioning

confidence: 99%

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Role of emission sources and atmospheric sink on the seasonal cycle of CH4 and δ13-CH4: analysis based on the atmospheric chemistry transport model TM5

Kangasaho

Tsuruta

Backman

et al. 2021

Preprint

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“…The CH 4 emission dynamics in rice paddies are mainly controlled by CH 4 production, oxidation, and transportation processes (Schütz et al, 1989). Plant‐mediated transportation usually dominates overall CH 4 emission (90%) (Butterbach‐Bahl et al, 1997; Schütz et al, 1989), so studies of CH 4 emission dynamics often do not pay enough attention to evaluating separately the plant‐ and water‐mediated pathways (Chanton et al, 1997; Khalil et al, 2008; Marik et al, 2002; Miyata et al, 2005; Rao et al, 2008; Tyler et al, 1994; Yagi et al, 1994; Zhang et al, 2011, 2012, 2017). For example, a study showed that CH 4 ebullition through paddy water accounted for 35–62% of total CH 4 emissions when rice straw was applied to tropical rice paddy fields (Wassmann et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

“…To date, most δ 13 CH 4 studies in rice paddy fields have investigated seasonal variations in CH 4 production, oxidation, and transportation processes (Bilek et al, 1999; Krüger et al, 2002; Marik et al, 2002; Nakagawa et al, 2002; Tyler et al, 1994, 1997; Zhang et al, 2011, 2012, 2013, 2016, 2017), but few have focused on diel variations. Two studies that have focused on diel variations of δ 13 CH 4 showed that δ 13 CH 4 emitted from rice paddies positively correlated with increasing CH 4 flux due to increasing transpiration rate or bubble ebullition (Chanton et al, 1997; Marik et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Stable Carbon Isotope Studies of CH₄ Dynamics Via Water and Plant Pathways in a Tropical Thai Paddy: Insights Into Diel CH₄ Transportation

et al. 2020

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Separate evaluation of methane (CH 4) emission dynamics (e.g., oxidation, production, and transportation) at the soil-plant-atmosphere and soil-water-atmosphere interfaces has been limited in tropical rice paddies, but it is crucial for comprehending the entire CH 4 cycles. We investigated CH 4 oxidation, production, and transportation through plant and water pathways during the reproductive stage in a tropical Thailand rice paddy field using natural abundance carbon stable isotope ratios (δ 13 CH 4 and δ 13 CO 2). Mass balance equations using δ 13 CH 4 and δ 13 CO 2 in soil gases indicated that CH 4 oxidation in the planted soil exceeded those in the interrow soil due to oxygen supply through rice roots. In addition, at 1-11 cm depth acetate fermentation was the dominant process in the planted soil, whereas in the interrow soil the dominant process was H 2 /CO 2 reduction. The water pathway showed a significant negative correlation between CH 4 flux and released δ 13 CH 4 over 24 hr, driven by a diel change in episodic ebullition, steady ebullition, and diffusion, all due to diel changes in soil temperature and atmospheric pressure. In contrast, the plant pathway showed a significant positive relationship between CH 4 flux and emitted δ 13 CH 4 throughout one day. A comparison of the diel change in emitted δ 13 CH 4 between the water and plant pathways showed that the rice plants transported CH 4 in soil bubbles without any large isotopic fractionation. The diel change in the plant-mediated CH 4 transportation was mainly controlled by diel changes in soil bubble expansion and CH 4 diffusion through plants, which were probably regulated by diel changes in soil temperature and atmospheric pressure. Plain Language Summary Methane (CH 4) emissions from paddy soil are mainly controlled by three processes: CH 4 production, CH 4 oxidation (consumption), and CH 4 transportation from soil to plant, water, and ultimately the atmosphere. There are two emission pathways, the soil-plant-atmosphere and soil-water-atmosphere interfaces, but there has not been much detailed evaluation of the different characteristics of the three processes in the two pathways. Here we evaluated CH 4 production, oxidation, and transportation at the soil-plant-atmosphere and soil-water-atmosphere interfaces during the reproductive stage of rice in a tropical Thailand paddy field. We found that in planted soil there was more CH 4 production by acetate fermentation and more CH 4 oxidation, due to more organic matter and oxygen supply, respectively, through plant roots. Methane was transported through water by three modes: episodic bubble ebullition, steady bubble ebullition, and diffusion. Diel variation in the rates of these three transportation modes was related to diel changes in soil temperature and atmospheric pressure. Methane in soil bubbles was also transported into the atmosphere through rice plants. Diel variation in the CH 4 transportation through rice plants was related to diel change in bubble expansion, which was also mainly regulated...

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Temporal variation of methanogenic pathways in rice fields under three different cropping systems

Zhu,

Ji,

Huang

et al. 2023

Biol Fertil Soils

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Variations of Stable Carbon Isotopes of CH4 Emission from Three Typical Rice Fields in China

Cited by 17 publications

References 32 publications

Role of emission sources and atmospheric sink on the seasonal cycle of CH<sub>4</sub> and δ<sup>13</sup>-CH<sub>4</sub>: analysis based on the atmospheric chemistry transport model TM5

Role of emission sources and atmospheric sink on the seasonal cycle of CH<sub>4</sub> and δ<sup>13</sup>-CH<sub>4</sub>: analysis based on the atmospheric chemistry transport model TM5

Stable Carbon Isotope Studies of CH₄ Dynamics Via Water and Plant Pathways in a Tropical Thai Paddy: Insights Into Diel CH₄ Transportation

Temporal variation of methanogenic pathways in rice fields under three different cropping systems

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Variations of Stable Carbon Isotopes of CH4 Emission from Three Typical Rice Fields in China

Cited by 17 publications

References 32 publications

Role of emission sources and atmospheric sink on the seasonal cycle of CH&lt;sub&gt;4&lt;/sub&gt; and δ&lt;sup&gt;13&lt;/sup&gt;-CH&lt;sub&gt;4&lt;/sub&gt;: analysis based on the atmospheric chemistry transport model TM5

Role of emission sources and atmospheric sink on the seasonal cycle of CH&lt;sub&gt;4&lt;/sub&gt; and δ&lt;sup&gt;13&lt;/sup&gt;-CH&lt;sub&gt;4&lt;/sub&gt;: analysis based on the atmospheric chemistry transport model TM5

Stable Carbon Isotope Studies of CH4 Dynamics Via Water and Plant Pathways in a Tropical Thai Paddy: Insights Into Diel CH4 Transportation

Temporal variation of methanogenic pathways in rice fields under three different cropping systems

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Product

Resources

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Role of emission sources and atmospheric sink on the seasonal cycle of CH<sub>4</sub> and δ<sup>13</sup>-CH<sub>4</sub>: analysis based on the atmospheric chemistry transport model TM5

Role of emission sources and atmospheric sink on the seasonal cycle of CH<sub>4</sub> and δ<sup>13</sup>-CH<sub>4</sub>: analysis based on the atmospheric chemistry transport model TM5

Stable Carbon Isotope Studies of CH₄ Dynamics Via Water and Plant Pathways in a Tropical Thai Paddy: Insights Into Diel CH₄ Transportation