Abstract
Rice (Oryza sativa L.) residues (root and straw) are unique substrates for microbes in paddy soils. Microbial respiration (RH) of paddy soils is likely to be affected by substrate quality. However, no relevant study on the effects of changed rice residue chemistry by climate change on the temperature sensitivity (Q10) of the RH of soils amended with the residues is available. To fill this knowledge gap, we conducted an incubation experiment (at 15, 25, and 35 °C) with rice residues of which lignin, nonstructural carbohydrate (NSC), and carbon-to-nitrogen ratio (C/N) were modified by growing the rice plants under different CO2 and air temperature (Tair). Co-elevated CO2 and Tair decreased lignin and C/N but increased the NSC contents of the residues, leading to the greater RH in the soils amended with rice residues produced under co-elevated CO2 and Tair compared to other CO2 or Tair treatments. However, the Q10 values of the RH of soils amended with rice residues produced under different CO2 and Tair were marginally changed, probably due to other confounding factors such as soil enzyme activity and nutrient availability. Despite that, there was a negative relationship between NSC and Q10 for soils amended with straw of which C/N is lower than root, agreeing with the kinetic theory on “substrate quality–Q10 relationship”. Our result suggests that residue chemistry may not affect the Q10 of soils with root residue, but for straw-amended soils, less-recalcitrant NSC rather than more-recalcitrant lignin of straw may be critical in determining the Q10 of the soils.
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The authors confirm that the data supporting the findings of this study are available in the article or the supplementary materials.
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This study was financially supported by the National Research Foundation of Korea (NRF-2022R1A2C1007402).
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H. J. P. investigated and curated the data, wrote the original draft, and visualized the study. W. J. C. supervised, acquired the fund, and reviewed and edited the manuscript.
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Park, HJ., Choi, WJ. Temperature sensitivity of microbial respiration of paddy soils amended with rice residues produced under elevated CO2 and warming. Biol Fertil Soils (2023). https://doi.org/10.1007/s00374-023-01770-0
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DOI: https://doi.org/10.1007/s00374-023-01770-0