Dynamics of Dissolved Organic Carbon and Methane Emissions in a Flooded Rice Soil

Lu, Yahai; Waßmann, Reiner; Neue, H. U.; Huang, Ce

doi:10.2136/sssaj2000.6462011x

Cited by 177 publications

(92 citation statements)

References 33 publications

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“…Using a photoacoustic technique, the same results were observed in a paddy field (Rothfuss et al, 1996). In other studies on an Italian rice field, from vertical profiles of the respiratory index, Rothfuss and Conrad (1993) found that acetate was more degraded by methanogenesis in 5 -11 cm soil depth compared to other soil layers, an indication that this layer is generally the zone for CH 4 production (Lu et al, 2000).…”

Section: Sample Analysis and Measurementssupporting

confidence: 70%

“…During the first two months after transplanting, pore water CH 4 concentrations were highly dependent on temperature -the higher the temperature, the higher the concentration during the 0-60 DAT. The differences in the seasonal temperature response of rate of accumulation of CH 4 in pore water could be due to the increases in methanogen populations (and their metabolic rates), methanogenic substrates (Wilson et al, 1989;Lu et al, 2000), and selflimiting processes such as transport and oxidation. However, over the season, there was no significant difference between CH 4 concentrations in the pore water across the four temperature treatments.…”

Section: Temporal Variationsmentioning

confidence: 99%

“…Similar trends were observed at all layers and different temperature set-ups. The decline in CH 4 concentrations in both planted and unplanted tubs towards the end of the season has been attributed to the decrease in the pool of decomposable dissolved organic material (Kimura et al, 1993;Lu et al, 2000) and population of CH 4 consuming bacteria in the soil (Dunfield et al, 1993). Despite the variations in the mean seasonal concentrations at different layers, the trends were similar for 10-20 cm soil layers and temperatures.…”

Section: Temporal Variationsmentioning

confidence: 99%

“…These higher values in planted tubs during this part of season could be due to additional CH 4 produced from roots exudates , root/rhizome distributions (Gross et al, 1993), while the low values after mid-season could be due to the effect of transport mechanisms from the soil to the atmosphere and O 2 transport into the root zone through plants Lindau, 1994;Lu et al, 1999;Lu et al, 2000).…”

mentioning

confidence: 99%

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Feedbacks of Methane and Nitrous Oxide Emissions from Rice Agriculture

Sithole

2000

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The effect of global warming on methane (CH 4 ) and nitrous oxide (N 2 O) emissions from agriculture was investigated and simulated from a soil warming experiment.Experiments were designed and installed in a temperature controlled greenhouse. The relationships between elevated temperatures and CH 4 and N 2 O emissions were determined and calculated as the Q 10 s of production, emission and oxidation. A study of the populations of methanogens and methanotrophs at a range of soil temperatures was performed based on soil molecular DNA analysis.This study showed that global warming would increase CH 4 emissions from rice agriculture and that the resultant emissions will be potentially large enough to cause changes in the present atmospheric concentrations. This research also showed that this increase was most evident for soil temperatures below 30 o C, above which emissions decreased with increasing temperature. The seasonal average Q 10 s of CH 4 emission, production, oxidation, methanogen and methanotroph populations were found to be 1.7, 2.6 and 2.2, 2.6 and 3.8, respectively, over a temperature of 20-32 o C. Considering that the processes of CH 4 production and emission are similar to those in natural wetlands, which is the largest source of atmospheric CH 4 , the contribution of this feedback is likely to cause a significant increase to the present CH 4 atmospheric budget if the current global warming trend persists over the next century.ii The Q 10 s of N 2 O emissions and production were 0.5-3.3 and 0.4-2.9, respectively. The low Q 10 values found for N 2 O suggest that although global warming will have a direct impact on the production and emission rates. Nevertheless, the magnitude of the impact of global on both CH 4 and N 2 O emissions from agriculture is likely to vary from one region to another due to the spatial variations in agricultural soil temperatures and the likely changes in the global regional distribution of water resources (water tables, rainfall patterns), water management practices and the responses of terrestrial CH 4 and N 2 O sources such as natural wetlands and plants.iii Acknowledgements

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Section: Sample Analysis and Measurementssupporting

confidence: 70%

Section: Temporal Variationsmentioning

confidence: 99%

Section: Temporal Variationsmentioning

confidence: 99%

mentioning

confidence: 99%

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Feedbacks of Methane and Nitrous Oxide Emissions from Rice Agriculture

Sithole

2000

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“…Root derived organic C can contribute to various C pools and become an origin of CH 4 emitted from flooded soils (Lu et al, 2000). In the total amount of atmospheric CH 4 , the contribution of CH 4 from sulfate-rich soils is negligible, because sulfate-reducing and methane producing organisms complete for the same substrates (H 2 /CO 2 , acetate-competitive substrates) but the sulfate reducers have the competitive advantage: they have stronger affinity to the competitive substrates and can use them to provide more energy than the methane producers (Schönheit et al, 1982).…”

Section: Concentrations Of Chmentioning

confidence: 99%

Fluxes of methane and distribution of sulfate as influenced by coastal salt-marsh soil ecosystem of Northern Germany

Khan

2017

Bangladesh J. Sci. Ind. Res.

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The study was conducted in Schleswig-Holstein at the Wadden sea coast of Northern Germany to evaluate the possible factors controlling methane (CH 4 ) and sulfate (SO 4 ) dynamics along a toposequence of daily to seasonally flooded coastal salt marsh soils. The soil at the top end of the salt marsh (with a height of 1.8 m above sea level: a.s.l. and a dense vegetation cover) was salic silty to clayic Typic Sulfaquent, while the soil at the bottom end (with some salt bushes and a 1.4 m a.s.l.) was sandy to silty Haplic Sulfaquent. The mean (depth: 0-100 cm) values of pH were around 7, and of redox potentials in the Typic Sulfaquent were ranged from -162 to +104 mV during all the seasons. The annual average emissions of CH 4 were almost 10 fold higher (0.3 g m -2 a -1 ) in Haplic Sulfaquent than that (0.03 g m -2 a -1 ) of the Typic Sulfaquent. In all the profiles, the concentrations of CH 4 were very low and varied significantly (p≥0.05) with the seasons and soil depths. The concentrations of CH 4 showed no dependence to temperature. The SO 4 contents were observed maximum in the Typic Sulfaquent followed by Haplic Sulfaquent during all the seasons. There is no noticeable correlation was obtained between the SO

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Modeling methane and nitrous oxide emissions from direct‐seeded rice systems

Simmonds

Lee

et al. 2015

JGR Biogeosciences

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Process‐based modeling of CH4 and N2O emissions from rice fields is a practical tool for conducting greenhouse gas inventories and estimating mitigation potentials of alternative practices at the scale of management and policy making. However, the accuracy of these models in simulating CH4 and N2O emissions in direct‐seeded rice systems under various management practices remains a question. We empirically evaluated the denitrification‐decomposition model for estimating CH4 and N2O fluxes in California rice systems. Five and nine site‐year combinations were used for calibration and validation, respectively. The model was parameterized for two cultivars, M206 and Koshihikari, and able to simulate 30% and 78% of the variation in measured yields, respectively. Overall, modeled and observed seasonal CH4 emissions were similar (R2 = 0.85), but there was poor correspondence in fallow period CH4 emissions and in seasonal and fallow period N2O emissions. Furthermore, management effects on seasonal CH4 emissions were highly variable and not well represented by the model (0.2–465% absolute relative deviation). Specifically, simulated CH4 emissions were oversensitive to fertilizer N rate but lacked sensitivity to the type of seeding system (dry seeding versus water seeding) and prior fallow period straw management. Additionally, N2O emissions were oversensitive to fertilizer N rate and field drainage. Sensitivity analysis showed that CH4 emissions were highly sensitive to changes in the root to total plant biomass ratio, suggesting that it is a significant source of model uncertainty. These findings have implications for model‐directed field research that could improve model representation of paddy soils for application at larger spatial scales.

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Dynamics of Dissolved Organic Carbon and Methane Emissions in a Flooded Rice Soil

Cited by 177 publications

References 33 publications

Feedbacks of Methane and Nitrous Oxide Emissions from Rice Agriculture

Feedbacks of Methane and Nitrous Oxide Emissions from Rice Agriculture

Fluxes of methane and distribution of sulfate as influenced by coastal salt-marsh soil ecosystem of Northern Germany

Modeling methane and nitrous oxide emissions from direct‐seeded rice systems

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