Wetland rice soils as sources and sinks of methane: a review and prospects for research

Kumaraswamy, S.; Rath, Arun Kumar; Ramakrishnan, B.; Sethunathan, N.

doi:10.1007/s003740000214

Cited by 60 publications

(45 citation statements)

References 107 publications

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“…At the same time, methane can also be oxidized by methanotrophs that settled in the rhizosphere of rice plants and at the surface of flooded rice soils (Kumaraswamy et al, 2000). Transport through rice plants, diffusion and ebullition serve as three vehicles for transport of methane from the sites of production in the soil to the atmosphere (Wassmann et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

“…Transport through rice plants, diffusion and ebullition serve as three vehicles for transport of methane from the sites of production in the soil to the atmosphere (Wassmann et al, 1993). Therefore, the entire process of methane emission from rice fields, including production, oxidation and transport to the atmosphere is affected by biotic and abiotic factors, such as growth status of rice, temperature, soil characteristics (Conrad and Rothfuss, 1991;Masscheleyn et al, 1993;Neue, 1993;Sass et al, 1994;Yang et al, 1994;Denier et al, 1996;Hanson and Hanson, 1996;Chang, 1997, 1998;Rath et al, 1999;Kumaraswamy et al, 2000). In addition, under dif- ferent exploitation methods, the amounts of methane emission from wetland ecosystem are also different, usually varying from 0.47 to 171.12 mg m −2 h −1 (Wei, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…These results have provided important scientific basis for stipulating measures to reduce methane emission. Some research workers have also suggested probable mitigation options, but most of them are location-specific, which is a major constraint for their universal adaptation to diverse rice field conditions (Kumaraswamy et al, 2000). Hogan et al (1991) suggest that the best mitigation approach would be to identify suitable and economically viable management practices for different methane emission sources and socioeconomic situations.…”

Section: Introductionmentioning

confidence: 99%

“…The increase in methane concentration in the atmosphere during the past decades has already aroused increasing concern throughout the world. Wetland rice agriculture is a major anthropogenic source of atmospheric methane (Conrad and Rothfuss, 1991;Conrad, 1996;Hanson and Hanson, 1996;Kumaraswamy et al, 2000), and this source has increased in recent years due to the expansion of rice cultivation (Singh and Singh, 1995). The amount of methane emission from wetland paddy fields accounts for 10-20% of total methane emission, amounting to 50-100 Tg year −1 Reiner and Milkha, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of methane emission from wetland rice–duck complex ecosystem

Huang

Wang

Huang

et al. 2005

Agriculture, Ecosystems & Environment

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characteristics of methane emission from wetland rice–duck complex ecosystem

Huang

Wang

Huang

et al. 2005

Agriculture, Ecosystems & Environment

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“…In paddy soils, CH 4 is produced by methanogenic archaea when soils turn anoxic after flooding (e.g., Kumaraswamy et al 2000). Generated CH 4 may be released to the atmosphere by (1) diffusional transport through the rice plants' aerenchyma, (2) aqueous diffusion to the water table and subsequent partitioning across the air/water interface, and (3) gas-bubble ebullition.…”

Section: Introductionmentioning

confidence: 99%

Circadian methane oxidation in the root zone of rice plants

2011

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In the root zone of rice plants aerobic methanotrophic bacteria catalyze the oxidation of CH 4 to CO 2 , thereby reducing CH 4 emissions from paddy soils to the atmosphere. However, methods for in situ quantification of microbial processes in paddy soils are scarce. Here we adapted the push-pull tracer-test (PPT) method to quantify CH 4 oxidation in the root zone of potted rice plants. During a PPT, a test solution containing CH 4 ± O 2 as reactant(s), Cl -and Ar as nonreactive tracers, and BES as an inhibitor of CH 4 production was injected into the root zone at different times throughout the circadian cycle (daytime, early nighttime, late nighttime). After a 2-h incubation phase, the test solution/pore-water mixture was extracted from the same location and rates of CH 4 oxidation were calculated from the ratio of measured reactant and nonreactive tracer concentrations. In separate rice pots, O 2 concentrations in the vicinity of rice roots were measured throughout the circadian cycle using a fiberoptic sensor. Results indicated highly variable CH 4 oxidation rates following a circadian pattern. Mean rates at daytime and early nighttime varied from 62 up to 451 lmol l -1 h -1, whereas at late nighttime CH 4 oxidation rates were low, ranging from 13 to 37 lmol l -1 h -1. Similarly, daytime O 2 concentration in the vicinity of rice roots increased to up to 250% air saturation, while nighttime O 2 concentration dropped to below detection (\0.15% air saturation). Our results suggest a functional link between root-zone CH 4 oxidation and photosynthetic O 2 supply.

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Mechanism and capacities of reducing ecological cost through rice–duck cultivation

Pan

Huang

Liao

et al. 2013

J. Sci. Food Agric.

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BACKGROUND: Rice–duck cultivation is the essence of Chinese traditional agriculture. A scientific assessment of the mechanism and its capacity is of theoretical significance and practical value in improving modern agricultural technology.RESULTS: The duck’s secretions, excreta and their treading, pecking and predation decrease the occurrence of plant diseases, pests and weeds, enrich species diversity and improve the field environment. The rice–duck intergrowth system effectively prevents rice planthoppers and rice leafhoppers. The control effects can be up to 98.47% and 100% respectively; it also has effects on the control of Chilo suppressalis, Tryporyza incertulas and the rice leafrollers. Notable control results are found on sheath blight, while the effects on other diseases are about 50%. Harm from weeds is placed under primary control; prevention of weeds is sequenced by broadleaf weeds > sedge weeds > Gramineae weeds. Contents of soil organic matter, N, P and K are improved by the system; nutrient utilization is accelerated, resulting in decreased fertilizer application. Greenhouse gas emissions are reduced by 1–2% and duck fodder is saved in this system. There is also an obvious economic benefit.CONCLUSION: Compared to conventional rice cultivation, rice–duck cultivation shows great benefits to ecologic cost and economic income. © 2013 The Authors. Journal of the Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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Wetland rice soils as sources and sinks of methane: a review and prospects for research

Cited by 60 publications

References 107 publications

Characteristics of methane emission from wetland rice–duck complex ecosystem

Characteristics of methane emission from wetland rice–duck complex ecosystem

Circadian methane oxidation in the root zone of rice plants

Mechanism and capacities of reducing ecological cost through rice–duck cultivation

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