The effects of elevated CO2and temperature on soil organic carbon and total nitrogen contents and mineralization in the 0 to 50 cm paddy soil layer were masked by different land use history

•Land use history alleviated the effects of 5-year T-FACE on dynamics of SOC and TN in 0‒50 cm paddy soil profile.•The effect of elevated CO2on δ13C was only found in 0‒10 cm soil layer.•Significant correlations of SOC, TN, δ13C, δ15N, decomposed C and mineralized N were found in 0‒50 cm soil profiles.•Investigation of original land use is needed prior to field observation experiment in paddy soils.