Microbiology of flooded rice paddies

Liesack, Werner; Schnell, Sylvia; Revsbech, Niels Peter

doi:10.1111/j.1574-6976.2000.tb00563.x

Cited by 448 publications

(207 citation statements)

References 159 publications

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“…With no-tillage, however, crop residues are kept on the soil surface, where O 2 diffusion from the atmosphere and rice aerenchym facilitates the formation of layers with an increased redox potential. Also, some field studies have exposed a depth gradient in soil redox potential (Liesack et al, 2000;Reddy and DeLaune, 2008;Zschornack et al, 2011) that is currently not simulated by DayCent. Further development of the redox potential algorithm of the model may lead to a better ability to capture these relationships.…”

Section: Methane Fluxesmentioning

confidence: 99%

Daycent Simulation of Methane Emissions, Grain Yield, and Soil Organic Carbon in a Subtropical Paddy Rice System

Weiler

Tornquist

Zschornack

et al. 2018

Rev. Bras. Ciênc. Solo

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ABSTRACT:The DayCent ecosystem model, widely tested in upland agroecosystems, was recently updated to simulate waterlogged soils. We evaluated the new version in a paddy rice experiment in Southern Brazil. DayCent was used to simulate rice yield, soil organic carbon (SOC), and soil CH 4 fluxes. Model calibration was conducted with a multiple-year dataset from the conventional tillage treatment, followed by a validation phase with data from the no-tillage treatment. Model performance was assessed with statistics commonly used in modeling studies: root mean square error (RMSE), model efficiency (EF), and mean difference (M). In general, DayCent slightly underestimated rice yields under no-tillage (by 0.07 Mg ha -1 , or 9.2 %) and slightly overestimated soil C stocks, especially in the first years of the experiment. A comparison of observed and simulated CH 4 daily fluxes showed that DayCent could simulate the general patterns of soil CH 4 fluxes with slight discrepancies. Daily soil CH 4 fluxes were overestimated by 0.43 kg ha -1 day -1 (12 %). Growth-season CH 4 emissions under no-tillage were also somewhat overestimated (11 % or 45.29 kg ha -1). We conclude that DayCent simulated SOC, rice yield, and CH 4 with some inaccuracies, but the overall performance was considered adequate. However, the model failed to represent the observed potential of no-tillage to mitigate CH 4 emissions, possibly because model algorithms could not capture the actual field conditions derived from no-tillage management, such as soil redox potential, plant senescence, and surface placement of plant residue.

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Section: Methane Fluxesmentioning

confidence: 99%

Daycent Simulation of Methane Emissions, Grain Yield, and Soil Organic Carbon in a Subtropical Paddy Rice System

Weiler

Tornquist

Zschornack

et al. 2018

Rev. Bras. Ciênc. Solo

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“…The opposite occurred in this experiment: %MeHg decreased in response to the AWD-35 treatment. Anaerobic microbes require appropriate redox conditions for growth (Liesack et al, 2000), so one explanation for the decrease in MeHg is that dry-downs oxidized the soil, resulting in less favorable redox conditions for Hg(II) methylators. The rapid oxidation of Fe during dry-downs (Fig.…”

Section: Soil Hg and Mehg Dynamicsmentioning

confidence: 99%

Alternate Wetting and Drying Decreases Methylmercury in Flooded Rice (Oryza sativa) Systems

Tanner

Windham‐Myers

Marvin-DiPasquale

et al. 2018

Soil Science Soc of Amer J

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In flooded soils, including those found in rice (Oryza sativa L.) fields, microbes convert inorganic Hg to more toxic methylmercury (MeHg). Methylmercury is accumulated in rice grain, potentially affecting health. Methylmercury in rice field surface water can bioaccumulate in wildlife. We evaluated how introducing aerobic periods into an otherwise continuously flooded rice growing season affects MeHg dynamics. Conventional continuously flooded (CF) rice field water management was compared with alternate wetting and drying, where irrigation was stopped twice during the growing season, allowing soil to dry to 35% volumetric moisture content, at which point plots were reflooded ( Abbreviations: %Fe(II), ferrous iron as a percent of total citrate-dithionite extractable Fe; %MeHg, the percentage of total Hg that is methylmercury; AWD, alternate wetting and drying; AWD-35, alternate wetting and drying to 35% volumetric moisture content; CF, continuous flooding; DAP, day after planting; Fe(II) AE , acid-extractable ferrous Fe; (Fe(III) a, amorphous ferric iron; Fe T , total citrate-dithionite extractable Fe; FeRB, Fe-reducing bacteria; MeHg, methylmercury; SRB, sulfate-reducing bacteria; THg, total Mg. R ice is grown on 161 million ha worldwide and is the staple crop for 3.5 billion people globally (Muthayya et al., 2014). Rice is a semiaquatic plant and is usually grown under flooded conditions to help control weeds, increase nutrient availability, and ensure water supply during drought (Kendig et al., 2003). Flooded conditions also allow rice fields to serve as important wildlife habitat (Czech and Parsons, 2002); however, rice production is also associated with several negative impacts. First, rice requires higher water inputs than other cereal crops (Pimentel et al., 2004). Increasing food demand from a growing population and decreasing water availability (Mekonnen and Hoekstra, 2016) are placing pressure on rice growers to reduce the amount of water used for rice production. Second, the global warming potential of rice is elevated compared with other crops, caused in large part by high methane emissions (Linquist et al., 2012;Wassmann et al., 2010). Finally, flooded conditions can also change the speciation and increase the bioavailability of As and k. Christy Tanner* Core Ideas• We studied how alternate wetting and drying (AWd) water management effects methylmercury (MeHg) dynamics in rice fields.• Alternate wetting and drying reduced MeHg concentrations in soil, water, and rice grain.• Iron speciation indicated that AWd oxidized the soil and regenerated electron acceptors.• Rice yield did not differ between AWd and the control over 4 yr.

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“…A lack of oxygenation of such microsites in drained microplots may promote the SRB population survival [49] and the sulfides production [50]. Therefore, an efficient oxygenation of soil by water drainage would significantly reduce anaerobic SRB population's development and activity.…”

Section: Impact Of Drainage On Srb Populations' Development and Activitymentioning

confidence: 99%

“…Rice plants can develop also physiological avoidance mechanisms to survive under toxic-sulfide condition [36] [49]. Indeed, sulfide toxicity depends on the strength of rice root oxidizing power, H 2 S concentration in the soil solution and root health [21] [38].…”

Section: Impact Of Drainage On Fkr 19 Rice Yieldmentioning

confidence: 99%

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Dynamics and Activity of Sulfate-Reducing Bacterial Populations in Paddy Soil under Subsurface Drainage: Case Study of Kamboinse in Burkina Faso

Otoidobiga¹,

Keïta²,

Yacouba³

et al. 2015

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Sulfide toxicity is a common disease generally associated with iron toxicity which occurs in rice fields when the Sulfate-Reducing Bacteria (SRB) produce sulfides ions in anaerobic conditions. The high quantity of sulfides ions in the soil solution upsets the mineral element balance in the rice, affects its growth and causes crop yield losses. In Burkina Faso, many rice field soils are abandoned due to sulfides toxicity. The present study was developed to evaluate the impact of subsurface drainage on SRB dynamics and activity during rice cultivation and the incidence on rice production. Twelve concrete microplots with a clay-loam soil and a rice variety susceptible to sulfides toxicity (FKR 19) were used for the experiment. Soil in microplots was drained for 7 days (P1), 14 days (P2), and 21 days (P3), respectively. Control (T) microplots without drainage were prepared similarly. The evolution of SRB populations and the content of sulfides ions in the paddy soil and in soil near rice roots were monitored throughout the cultural cycle using MPN and colorimetric methods, respectively. Data obtained were analyzed in relation to drainage frequency, rice growth stage, and rice yield using the Student's t-test and XLSTAT 7.5.2 statistical software. From the results obtained, the subsurface drainage did not affect significantly SRB populations (P = 0.187). However, the drainage affected significantly sulfides concentration in the soil near rice roots (P = 0.032). The concentration of sulfides (P < 0.0001) in soil near rice roots and the number of SRB (P < 0.0001) were significantly higher during the rice tillering and maturity stages. Although no significant difference was observed for rice yield among treatments (P = 0.209), the P2 * Corresponding author. C. H. Otoidobiga et al. 1394subsurface drainage showed the highest yield and a low concentration of sulfides in soil near rice roots.

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Microbiology of flooded rice paddies

Cited by 448 publications

References 159 publications

Daycent Simulation of Methane Emissions, Grain Yield, and Soil Organic Carbon in a Subtropical Paddy Rice System

Daycent Simulation of Methane Emissions, Grain Yield, and Soil Organic Carbon in a Subtropical Paddy Rice System

Alternate Wetting and Drying Decreases Methylmercury in Flooded Rice (Oryza sativa) Systems

Dynamics and Activity of Sulfate-Reducing Bacterial Populations in Paddy Soil under Subsurface Drainage: Case Study of Kamboinse in Burkina Faso

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