Acta Agriculturae Zhejiangensis ›› 2024, Vol. 36 ›› Issue (8): 1867-1877.DOI: 10.3969/j.issn.1004-1524.20230691

• Environmental Science • Previous Articles     Next Articles

Effects of montmorillonite, kaolinite and basalt on soil carbon sequestration

XU Junyan1,2(), QIU Gaoyang2,3, LIU Junli2, GUO Bin2, LI Hua2, CHEN Xiaodong2, WANG Yuan2, FU Qinglin2,*()   

  1. 1. College of Quality and Safety Engineering, China Jiliang University, Hangzhou 310018, China
    2. Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
    3. Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
  • Received:2023-05-29 Online:2024-08-25 Published:2024-09-06
  • Contact: FU Qinglin

Abstract:

To investigate the impact of basalt, montmorillonite, and kaolinite on soil physicochemical properties and carbon pool components, a field micro-plot experiment was conducted to assess their effects on soil particle structure, pH, and contents of available nutrients, dissolved organic carbon (DOC), microbial biomass carbon (MBC), organic carbon, and inorganic carbon. It was shown that compared to the treatment using pecan shell organic fertilizer alone (H), the treatments of co-application of pecan shell organic fertilizer+basalt (BH), pecan shell organic fertilizer montmorillonite (MH), or pecan shell organic fertilizer+kaolinite (KH) significantly (P<0.05) reduced soil MBC content by 8.7%, 10.3%, and 9.7%, respectively. The BH treatment significantly increased soil pH value by 0.80 and elevated soil DOC, organic carbon, and inorganic carbon contents by 9.4%, 3.6%, and 939.2%, respectively. The MH treatment significantly boosted the soil exchangeable calcium and magnesium content and cation exchange capacity by 77.3%, 471.7%, and 80.2%, respectively, and increased the soil organic carbon and inorganic carbon contents by 2.5% and 543.2%, respectively. The KH treatment significantly enhanced the proportion of water-stable macroaggregates (particle size ≥ 0.25 mm) by 2.3 percentage points, and raised the soil organic carbon and inorganic carbon contents by 2.8% and 646.3%, respectively. Except for the significant rise in available potassium content under BH and MH treatments, BH, MH and KH treatments had no significant impact on the contents of the other available nutrients (alkali-hydrolyzable nitrogen and available phosphorus). In conclusion, applications of basalt, montmorillonite, and kaolinite combined with organic fertilizer could stabilize the soil organic carbon, which achieved the synergistic stabilization of both organic and inorganic carbon, and the application of basalt combined with organic fertilize showed the best effect on the inorganic carbon sequestration.

Key words: basalt weathering, clay mineral, soil organic carbon, soil inorganic carbon

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