Abstract
Soil organic carbon (SOC) stability and dynamics are greatly influenced by long-term elevated atmospheric CO2 [CO2]. The priming effect (PE) is vital in SOC stability and dynamics, but its role in paddy soil under long-term elevated [CO2] remains unclear. To examine how SOC stability changed in paddy soil after long-term elevated atmospheric CO2 enrichment, the PE was quantified through a 13C-glucose-induced experiment with different N levels for topsoil (0–20 cm) from paddy free-air CO2 enrichment (FACE) platform. Compared with the ambient CO2 concentration ([CO2]), 10 years of elevated [CO2] (500 µmol·mol−1) significantly increased SOC and TN content by 18.4% and 19.0%, respectively, while the C/N ratio was not changed. The labile C fractions including dissolved organic carbon (DOC) and readily oxidizable organic carbon (ROC), but excluding microbial biomass C (MBC), accumulated faster than SOC in paddy soil, which implied the reduced SOC stability for long-term elevated [CO2] enrichment. With the decline of SOC stability, the exogenously induced cumulative specific PE (PE per gram of SOC) remarkably increased by 41.1–72.7% for elevated [CO2] fumigation. The cumulative PE, especially the cumulative specific PE, was found significantly linearly correlated with the ROC content or ROC/SOC ratio (labile SOC pool). Furthermore, the application of nitrogen fertilizer slowed down the PE under elevated [CO2] condition. Our results showed that long-term elevated [CO2] enrichment reduced SOC stability and, together with exogenous nitrogen fertilizer, regulated the PE in paddy soil.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank Dr. Xiaoyu Liu for his technical support during the FACE experimentation.
Funding
This work was co‐financed by the National Natural Science Foundation of China (Grant No. 31971508), the Carbon Peaking and Carbon Neutrality Special Fund for Science and Technology from Nanjing Science and Technology Bureau (20221103), the Key Research and Development Plan of Jiangsu Province (BE2022308), and the Fundamental Research Funds for the Central Universities of China (JUSRP22005).
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H. Y.: conceptualization, writing of original draft, and funding acquisition. M. H.: conceptualization, investigation, and writing of original draft. C. C., Y. T., and K. N.: writing including review and editing. F. L., G. D., X. B., and J. Y.: investigation. L. Z.: supervision. C. Z.: funding acquisition and writing including review and editing.
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Yu, H., Han, M., Cai, C. et al. Soil organic carbon stability and exogenous nitrogen fertilizer influence the priming effect of paddy soil under long-term exposure to elevated atmospheric CO2. Environ Sci Pollut Res 30, 102313–102322 (2023). https://doi.org/10.1007/s11356-023-29485-7
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DOI: https://doi.org/10.1007/s11356-023-29485-7