An Empirical Model of Soil Chemical Properties that Regulate Methane Production in Japanese Rice Paddy Soils

Cheng, Weiguo; Yagi, Kazuyuki; Akiyama, Hiroko; Nishimura, Seiichi; Sudo, Shigeto; Fumoto, Tamon; Hasegawa, Toshihiro; Hartley, Anne E.; Megonigal, J. Patrick

doi:10.2134/jeq2007.0201

Cited by 36 publications

(20 citation statements)

References 20 publications

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“…We assumed a time constant of 30 days (the average time for other electron acceptors to be consumed) for the resumption of methane production. Such delayed impacts have been demonstrated in other studies (Conrad, 2002;Cheng et al, 2007;Lovley and Phillips, 1987;van Bodegom and Stams, 1999). This redox function was first introduced in Riley et al (2011).…”

Section: Redox Potential Effects On Methanogenesissupporting

confidence: 74%

“…Studies have suggested that methane production will not occur until a significant amount of Fe (III) has been reduced to Fe (II) (Cheng et al, 2007;Conrad, 2002). Based on laboratory experiments, Cheng et al (2007) developed an empirical model to include soil chemical properties (such as available N and Fe (II)) in predicting methane emissions from Japanese rice paddy soils. They showed that methane representative of the inundated fraction that is predicted by the model.…”

Section: Redox Potential Effects On Methanogenesismentioning

confidence: 99%

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Sensitivity of wetland methane emissions to model assumptions: application and model testing against site observations

et al. 2012

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Abstract. Methane emissions from natural wetlands and rice paddies constitute a large proportion of atmospheric methane, but the magnitude and year-to-year variation of these methane sources are still unpredictable. Here we describe and evaluate the integration of a methane biogeochemical model (CLM4Me; Riley et al., 2011) into the Community Land Model 4.0 (CLM4CN) in order to better explain spatial and temporal variations in methane emissions. We test new functions for soil pH and redox potential that impact microbial methane production in soils. We also constrain aerenchyma in plants in always-inundated areas in order to better represent wetland vegetation. Satellite inundated fraction is explicitly prescribed in the model, because there are large differences between simulated fractional inundation and satellite observations, and thus we do not use CLM4-simulated hydrology to predict inundated areas. A rice paddy module is also incorporated into the model, where the fraction of land used for rice production is explicitly prescribed. The model is evaluated at the site level with vegetation cover and water table prescribed from measurements. Explicit site level evaluations of simulated methane emissions are quite different than evaluating the grid-cell averaged emissions against available measurements. Using a baseline set of parameter values, our model-estimated average global wetland emissions for the period 1993-2004 were 256 Tg CH 4 yr −1 (including the soil sink) and rice paddy emissions in the year 2000 were 42 Tg CH 4 yr −1 . Tropical wetlands contributed 201 Tg CH 4 yr −1 , or 78 % of the global wetland flux. Northern latitude (>50 N) systems contributed 12 Tg CH 4 yr −1 . However, sensitivity studies show a large range (150-346 Tg CH 4 yr −1 ) in predicted global methane emissions (excluding emissions from rice paddies). The large range is sensitive to (1) the amount of methane transported through aerenchyma, (2) soil pH (±100 Tg CH 4 yr −1 ), and (3) redox inhibition (±45 Tg CH 4 yr −1 ). Results are sensitive to biases in the CLMCN and to errors in the satellite inundation fraction. In particular, the high latitude methane emission estimate may be biased low due to both underestimates in the high-latitude inundated area captured by satellites and unrealistically low high-latitude productivity and soil carbon predicted by CLM4.

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Section: Redox Potential Effects On Methanogenesissupporting

confidence: 74%

Section: Redox Potential Effects On Methanogenesismentioning

confidence: 99%

Sensitivity of wetland methane emissions to model assumptions: application and model testing against site observations

et al. 2012

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“…The cumulative CO 2 productions from each soil sample during the incubation periods of 6, 12, 18, and 24 weeks were calculated from the biweekly production (Cheng et al 2007). CH 4 emission was not detected in this incubation experiment.…”

Section: Aerobic Incubation Experimentsmentioning

confidence: 99%

Modeling aerobic decomposition of rice straw during the off-rice season in an Andisol paddy soil in a cold temperate region of Japan: Effects of soil temperature and moisture

Nakajima

Cheng

Tang

et al. 2015

Soil Science and Plant Nutrition

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Submerged rice paddies are a major source of methane (CH 4 ) which is the second most important greenhouse gas after carbon dioxide (CO 2 ). Accelerating rice straw decomposition during the off-rice season could help to reduce CH 4 emission from rice paddies during the single rice-growth season in cold temperate regions. For understanding how both temperature and moisture can affect the rate of rice straw decomposition during the off-rice season in the cold temperate region of Tohoku district, Japan, a modeling incubation experiment was carried out in the laboratory. Bulk soil and soil mixed with 2% of δ 13 C-labeled rice straw with a full factorial combination of four temperature levels (−5 to 5, 5, 15, 25°C) and two moisture levels (60% and 100% WFPS) were incubated for 24 weeks. The daily change from −5 to 5°C was used to model the freezing-thawing cycles occurring during the winter season. The rates of rice straw decomposition were calculated by (i) CO 2 production; (ii) change in the soil organic carbon (SOC) content; and (iii) change in the δ 13 C value of SOC. The results indicated that both temperature and moisture affected the rate of rice straw decomposition during the 24-week aerobic incubation period. Rates of rice straw decomposition increased not only with high temperature, but also with high moisture conditions. The rates of rice straw decomposition were more accurately calculated by CO 2 production compared to those calculated by the change in the SOC content, or in its δ 13 C value. Under high moisture at 100% WFPS condition, the rates of rice straw decomposition were 14.0, 22.2, 33.5 and 46.2% at −5 to 5, 5, 15 and 25°C temperature treatments, respectively. While under low moisture at 60% WFPS condition, these rates were 12.7, 18.3, 31.2 and 38.4%, respectively. The Q 10 of rice straw decomposition was higher between −5 to 5 and 5°C than that between 5 and 15°C and that between 15 and 25°C. Daily freezing-thawing cycles (from −5 to 5°C) did not stimulate rice straw decomposition compared with low temperature at 5°C. This study implies that to reduce CH 4 emission from rice paddies during the single rice-growth season in the cold temperate regions, enhancing rice straw decomposition during the high temperature period is very important. ARTICLE HISTORY

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“…S). Cheng et al (2007) reported that methane production (P CH4 ) in nine types of rice soils in Japan incubated for 16 weeks could be simplified to the balance of available N (N av ) and total iron as P CH4 = 1.59*N av -2.46*(total Fe)/1000. Such a formula can also be described for Southeast Asian paddy soils, taking the linear regression line in Fig.…”

Section: Discussionmentioning

confidence: 99%

Effect of oxidizing and reducing agents in soil on methane production in Southeast Asian paddies

Inubushi

Saito

Arai

et al. 2017

Soil Science and Plant Nutrition

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Methane is one of the greenhouse gases emitted from paddy soil ecosystems and may induce global warming and climate change; therefore, mitigation options are urgently required to establish mitigation technology to reduce methane emission without affecting rice production. Methane is produced by a balance between oxidizing agents (such as iron) and reducing agents (easily decomposable soil organic matter), according to the so-called Takai theory. To evaluate options for mitigating methane production potential and to examine the applicability of the Takai theory in Southeast Asian paddy soils, 23 soil samples were collected from Thailand, Indonesia, Philippines, and Vietnam. These soil samples were anaerobically incubated to measure their methane production potential and examined to see whether their chemical properties, such as the ferrous, total iron, and organic matter contents, were correlated. We found a significant negative correlation between the methane production potential and the total iron content, and a positive correlation between the methane production potential and the hexose content, as an index for a soil's easily decomposable organic matter content. The methane-C/CO 2 -C production ratio was also positively correlated with the mineralizable nitrogen/ferrous contents ratio, which indicated that the Takai theory, established for Japanese paddy soils, is also useful in Southeast Asian paddy soils and that the soil's iron content is important to estimate the methane production potential. ARTICLE HISTORY

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An Empirical Model of Soil Chemical Properties that Regulate Methane Production in Japanese Rice Paddy Soils

Cited by 36 publications

References 20 publications

Sensitivity of wetland methane emissions to model assumptions: application and model testing against site observations

Sensitivity of wetland methane emissions to model assumptions: application and model testing against site observations

Modeling aerobic decomposition of rice straw during the off-rice season in an Andisol paddy soil in a cold temperate region of Japan: Effects of soil temperature and moisture

Effect of oxidizing and reducing agents in soil on methane production in Southeast Asian paddies

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