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<p>The long-term application of chemical nitrogen fertilizers has caused soil acidification, which has had a negative impact on soil quality. Because bioremediation is environmentally friendly, free from secondary pollution, and capable of providing long-term improvement, microbially induced carbonate precipitation (MICP) was adopted in this study for the remediation of acidified soils. MICP is a biomineralization process whereby microorganisms induce the formation of inorganic mineral precipitates through their metabolic activities. In this study, a lignocellulose-degrading fungal strain (<i>Irpex lacteus</i> IL-1) was isolated and co-cultured with a laboratory-preserved urea-hydrolyzing bacteria (<i>Bacillus megaterium</i> CM-1), together with maize straw, to ameliorate acidified soils. After 7&#xa0;days of mineralization of the composite microbial system in the laboratory, the presence of IL-1 increased the urease activity of CM-1 and the mineralized CaCO<sub>3</sub> production by 91.63% and 32.98%, respectively. In the soil experiment, this treatment group was designated as the T7. Compared with the control (CK), T7 treatment increased soil organic carbon (SOC) and CaCO<sub>3</sub> contents by 22.57% and 56.85%, respectively. Soil pH was elevated to 7.05. Moreover, metagenomic analysis revealed that T7 treatment increased the relative abundance of functional microorganisms and overall microbial diversity, enhanced the abundance of carbohydrate-active enzyme genes, and promoted metabolic pathways related to soil carbon and nitrogen cycling. These findings provide theoretical support and empirical evidence for raising the quality of acidified soils and enhancing soil inorganic carbon content.</p> Graphical Abstract <p></p>

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Synergistic Regulation of Microbially Induced Calcium Carbonate Precipitation by Maize Straw and Composite Microorganisms for Alleviating Soil Acidification and Enhancing Carbon Sequestration

  • 期刊论文

  • 发表日期：

    2026年5月1日

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  • Dongxu Han,
  • Yuhan Shao,
  • Jihong Wang

摘要

The long-term application of chemical nitrogen fertilizers has caused soil acidification, which has had a negative impact on soil quality. Because bioremediation is environmentally friendly, free from secondary pollution, and capable of providing long-term improvement, microbially induced carbonate precipitation (MICP) was adopted in this study for the remediation of acidified soils. MICP is a biomineralization process whereby microorganisms induce the formation of inorganic mineral precipitates through their metabolic activities. In this study, a lignocellulose-degrading fungal strain (Irpex lacteus IL-1) was isolated and co-cultured with a laboratory-preserved urea-hydrolyzing bacteria (Bacillus megaterium CM-1), together with maize straw, to ameliorate acidified soils. After 7 days of mineralization of the composite microbial system in the laboratory, the presence of IL-1 increased the urease activity of CM-1 and the mineralized CaCO3 production by 91.63% and 32.98%, respectively. In the soil experiment, this treatment group was designated as the T7. Compared with the control (CK), T7 treatment increased soil organic carbon (SOC) and CaCO3 contents by 22.57% and 56.85%, respectively. Soil pH was elevated to 7.05. Moreover, metagenomic analysis revealed that T7 treatment increased the relative abundance of functional microorganisms and overall microbial diversity, enhanced the abundance of carbohydrate-active enzyme genes, and promoted metabolic pathways related to soil carbon and nitrogen cycling. These findings provide theoretical support and empirical evidence for raising the quality of acidified soils and enhancing soil inorganic carbon content.

Graphical Abstract