Soil carbon turnover and balance in the priming effects of basalt, montmorillonite, and kaolinite in a Luvisol soil

文献类型： 外文期刊

第一作者： Xu, Junyan

作者： Xu, Junyan;Zhang, Ming;Xu, Junyan;Liu, Junli;Fu, Qinglin;Guo, Bin;Li, Hua;Chen, Xiaodong;Qiu, Gaoyang;Qiu, Gaoyang

作者机构：

关键词： Basalt weathering; Priming effect; Soil inorganic carbon stabilization; Soil organic carbon stabilization; Soil net carbon balance

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.6； 五年影响因子：3.8 ）

ISSN： 1439-0108

年卷期： 2023 年

页码：

收录情况： SCI

摘要： 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 C-13-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 C-13 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 beta-glucosidase (S-beta-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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