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Gilmour, Cynthia C.; Riedel, Gerhardt; Ederington, M.C.; Bell, James Tyler; Gill, Gary A.; Stordal, M. C.

doi:10.1023/a:1005972708616

Cited by 403 publications

(96 citation statements)

References 37 publications

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“…Net MSR is indicated by the declining concentration of sulfate with depth, and by the direct measurement of 35 SO 4 2-reduction to 35 S 2− in intact soil cores (Gilmour et al, 1998). MSR rates are usually maximal in the top few cm of sediments.…”

Section: Biogeochemistry Of Sulfurmentioning

confidence: 99%

“…Sulfate is known to be an important control on the production of MeHg in aquatic ecosystems (Benoit et al, 2003;Gilmour et al, 1992), including the Everglades (Gilmour et al, 1998). MeHg production in most ecosystems reflects a balance between microbial sulfate reduction, and sulfide accumulation in soil or soil pore waters (Benoit et al, 2003).…”

Section: Impacts On Mehg Production and Bioaccumulationmentioning

confidence: 99%

“…In sulfate-enriched areas (>20 mg l ) have sulfate and sulfide levels that promote maximum MeHg production. During the mid to late 1990s, the highest MeHg levels in soil (Gilmour et al, 1998), fish (Stober et al, 1996(Stober et al, , 2001, and wading birds (Frederick et al, 1997) in the Everglades were observed near the center of WCA-3A. At that time, sulfate concentrations in surface water in central WCA-3A ranged from 2 to 10 mg l ) to prevent sulfide inhibition of mercury methylation (Orem et al, 1997;Stober et al, 1996Stober et al, , 2001). )…”

Section: Impacts On Mehg Production and Bioaccumulationmentioning

confidence: 99%

See 2 more Smart Citations

Sulfur in the South Florida Ecosystem: Distribution, Sources, Biogeochemistry, Impacts, and Management for Restoration

Orem

Gilmour

Axelrad

et al. 2011

Critical Reviews in Environmental Science and Technology

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Section: Biogeochemistry Of Sulfurmentioning

confidence: 99%

Section: Impacts On Mehg Production and Bioaccumulationmentioning

confidence: 99%

Section: Impacts On Mehg Production and Bioaccumulationmentioning

confidence: 99%

See 1 more Smart Citation

Sulfur in the South Florida Ecosystem: Distribution, Sources, Biogeochemistry, Impacts, and Management for Restoration

Orem

Gilmour

Axelrad

et al. 2011

Critical Reviews in Environmental Science and Technology

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“…Many studies showed that sulfate-reducers are common in flooded soils and they are also found near rice roots [8] [32].…”

Section: Effect Of Soil Moisture On Srb Populations Dynamic and Activitymentioning

confidence: 99%

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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“…Wetland soils, including rice fields, are important sites of MeHg production (Gilmour et al, 1998;Krabbenhoft et al, 1995;Marvin-DiPasquale et al, 2014;Podar et al, 2015;Windham-Myers et al, 2014). Methylmercury produced in rice field soil is accumulated by rice plants more readily than inorganic Hg (Strickman and Mitchell, 2017;Zhang et al, 2010).…”

mentioning

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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Untitled

Cited by 403 publications

References 37 publications

Sulfur in the South Florida Ecosystem: Distribution, Sources, Biogeochemistry, Impacts, and Management for Restoration

Sulfur in the South Florida Ecosystem: Distribution, Sources, Biogeochemistry, Impacts, and Management for Restoration

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

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

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