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<p>Soil acidification poses a critical threat to sustainable agricultural production by compromising soil fertility. Conventional remediation strategies for acidic soils face persistent challenges including short-lived efficacy, structural deterioration, and secondary pollution risks. This study presents an innovative bioremediation approach utilizing <i>Alcaligenes faecalis</i> (<i>A. faecalis</i>), a potent alkaline-metabolizing microorganism, coated with calcium silicate hydrate (CSH) and humic acid (HA) as a biocarrier for acidic farmland soil restoration. Through microcosm experiments and high-throughput sequencing analysis, we demonstrat that the remediation approach achieved a substantial soil pH increase from 4.66 to 6.41 within 21 d. Soil available nitrogen (AN) and silicon (ASi) contents increased to 252.83–595.70 mg/kg and 89.24–133.57 mg/kg at 21 d, respectively; and available phosphorus (AP) content increased from 15.59–39.88 mg/kg to 20.44–55.98 mg/kg at 7 d. Positive correlations were observed between pH and all nutrient indicators for soil samples. Moreover, the restoration could also change the microbial diversity and structure. This led to an increase in the relative abundance of functional genera including <i>Bacillus</i> (from 0.44–0.65% to 4.92–21.89%), <i>Arthrobacter</i> (from 0.13–0.30% to 0.17–16.31%), and <i>Paenochrobactrum</i> (from 0.02–0.04% to 0.75–17.43%) at 5 d. These microorganisms were related to soil nitrogen, phosphorus, and silicon cycling, which were positively correlated with an increase in AN, ASi and AP content in soils. These findings highlight the application potential of <i>A. faecalis</i> as a biomaterial for soil improvement in acidic farmland, providing a novel option for the improvement of acidic soil.</p>

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Improvement Effects of Calcium Silicate Hydrate and Humic Acid-Encapsulated Alcaligenes faecalis on Acidic Farmland Soil and Alterations in Microbial Community Structure

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Luhua Jiang,
  • Manjun Miao,
  • Ziwen Guo,
  • Jiejie Yang,
  • Yulong Peng,
  • Junzhao Wu,
  • Bo Miao,
  • Yili Liang,
  • Huidan Jiang,
  • Xueduan Liu

摘要

Soil acidification poses a critical threat to sustainable agricultural production by compromising soil fertility. Conventional remediation strategies for acidic soils face persistent challenges including short-lived efficacy, structural deterioration, and secondary pollution risks. This study presents an innovative bioremediation approach utilizing Alcaligenes faecalis (A. faecalis), a potent alkaline-metabolizing microorganism, coated with calcium silicate hydrate (CSH) and humic acid (HA) as a biocarrier for acidic farmland soil restoration. Through microcosm experiments and high-throughput sequencing analysis, we demonstrat that the remediation approach achieved a substantial soil pH increase from 4.66 to 6.41 within 21 d. Soil available nitrogen (AN) and silicon (ASi) contents increased to 252.83–595.70 mg/kg and 89.24–133.57 mg/kg at 21 d, respectively; and available phosphorus (AP) content increased from 15.59–39.88 mg/kg to 20.44–55.98 mg/kg at 7 d. Positive correlations were observed between pH and all nutrient indicators for soil samples. Moreover, the restoration could also change the microbial diversity and structure. This led to an increase in the relative abundance of functional genera including Bacillus (from 0.44–0.65% to 4.92–21.89%), Arthrobacter (from 0.13–0.30% to 0.17–16.31%), and Paenochrobactrum (from 0.02–0.04% to 0.75–17.43%) at 5 d. These microorganisms were related to soil nitrogen, phosphorus, and silicon cycling, which were positively correlated with an increase in AN, ASi and AP content in soils. These findings highlight the application potential of A. faecalis as a biomaterial for soil improvement in acidic farmland, providing a novel option for the improvement of acidic soil.