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Division S-10—Wetland Soils

Redox Window with Minimum Global Warming Potential Contribution from Rice Soils

Wetland Biogeochemistry Institute, Louisiana State Univ., Baton Rouge, LA 70803

^* Corresponding author (kyu1{at}lsu.edu)

Eight different rice (Oryza sativa L.) soils were incubated using a microcosm technique to study CO₂, CH₄, and N₂O contribution to global warming potential (GWP) at different redox potential (E_H) conditions. Cumulative GWP from these three greenhouse gases reached a minimum at a redox "window" of +180 to –150 mV. Within the redox window, CO₂ production accounted for 86% of the cumulative GWP, because both N₂O and CH₄ production were low. When E_H was higher than +180 mV, both CO₂ and N₂O production made a significant contribution to the cumulative GWP, whereas CH₄ production was a dominant contributor when E_H was lower than –150 mV. During the incubation, each soil exhibited a unique signature of developing such an optimum redox window with a minimum GWP. Multiple regressions showed that initial soil organic matter (OM) and S content might have a significant control (P = 0.02) on the time required for the soils to reach the redox window when the incubation started from aerobic conditions. The results of this integrated study on productions of the three greenhouse gases provide a theoretical base for abating soil GWP loading into the atmosphere by regulating soil E_H conditions.

Abbreviations: E_H, redox potential • GWP, global warming potential • IPCC, Intergovernmental Panel on Climate Change • OM, organic matter

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