Appendix S1  Rice plants grown under free-air CO2 enrichment.

Appendix S2  Aboveground and belowground biomass of rice plants.

Appendix S3  Dissolved organic C, dissolved CO2 and CH4 at 5 cm soil depth.

Appendix S4  Concentrations of sulfate ion (SO42−) in soil solutions extracted in situ at 5 and 15 cm depths.

Appendix S5  Concentrations of reduced iron, reduced manganese, calcium, and magnesium in soil solutions extracted in situ at 5 cm depth.

Appendix S6  Soil redox potential dynamics at 5, 10 and 15 cm soil depths.

Appendix S7  Concentrations of Fe2+ and Mn2+ in the calcareous soil and red soil.

Appendix S8  Effects of elevated CO2 on low-molecular-weight organic acids excreted by roots of rice plants.

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