Abstract
Purpose
Basalt weathering has the potential to absorb and sequester CO2 as inorganic carbon, while its weathering byproducts, montmorillonite and kaolinite, have the capacity to stabilize organic carbon. Nonetheless, the practical viability of basalt weathering in achieving the stabilization of inorganic carbon and its impact on organic carbon dynamics in the soil priming effect (PE) remains unclear.
Methods
An incubation experiment was conducted by adding 13C-glucose with or without basalt, montmorillonite, or kaolinite to a Luvisol soil planted with peach (Prunus persica (L.) Batsch) for more than 20 years. CO2 emission and its 13C value were continuously measured to calculate the PE and soil net carbon balance.
Results
After a 28-day incubation, basalt resulted in an increase in soil pH from 5.32 to 7.17 and showed a 143.7% and 168.6% increase in dissolved organic carbon (DOC) and soil inorganic carbon (SIC), respectively. Subsequently, basalt induced the highest cumulative PE among all treatments, with the activities of soil β-glucosidase (S-β-GC), soil leucine amino peptidase (S-LAP), and soil catalase (S-CAT) being the highest. Furthermore, kaolinite significantly decreased emissions of CO2-C, glucose mineralization, and cumulative PE (P < 0.05). It is worth noting that all treatments significantly enhanced the net soil net carbon balance, with the most significant improvement observed in the kaolinite treatment.
Conclusions
The weathering process of basalt can significantly promote the stabilization of SIC in PE, whereas kaolinite exhibits the most pronounced impact on the stabilization of soil organic carbon (SOC), resulting in the greatest increase in soil net carbon balance.
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Data availability
The data supporting the findings of this study can be provided by the corresponding author upon a reasonable request.
Abbreviations
- PE:
-
Priming effect
- DOC:
-
Dissolved organic carbon
- SIC:
-
Soil inorganic carbon
- S-β-GC:
-
Soil β-glucosidase
- S-LAP:
-
Soil leucine amino peptidase
- S-CAT:
-
Soil catalase
- SOC:
-
Soil organic carbon
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Funding
This work was supported by the National Natural Science Foundation of China (42207356), Zhejiang Key Research and Development Plan (2022C02022), and Fundamental Research Funds for the Central Universities (226-2023-00077).
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JX: investigation, writing—original draft preparation. QF: methodology, funding acquisition, investigation, supervision and revision. JL: investigation, writing—reviewing and editing. MZ and BG: supervision. HL and XC: writing—reviewing and editing. GQ: conceptualization, methodology, funding acquisition, writing—reviewing and editing, supervision.
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Xu, J., Liu, J., Fu, Q. et al. Soil carbon turnover and balance in the priming effects of basalt, montmorillonite, and kaolinite in a Luvisol soil. J Soils Sediments 24, 732–743 (2024). https://doi.org/10.1007/s11368-023-03676-8
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DOI: https://doi.org/10.1007/s11368-023-03676-8