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Abstract. Controlled-environment chambers were used to study the effects of elevated CO2 concentrations on biological N fixation, N mineralization and C decomposition in rice soil. In three chambers, CO2 concentration was maintained at 35315/39623mol mol1 (day/night; ambient CO2), while in another three, CO2 was maintained at 66736/70041mol mol1 (day/night; elevated CO2) throughout the growing season...
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