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<p>Drought significantly alters soil microbial activity and carbon cycling, yet its effects across contrasting land-use systems remain insufficiently understood. This study investigated drought-induced changes in microbial communities and carbon dynamics in agricultural and forest soils from Kushtia, Bangladesh, using mesocosm experiments under control (25% WHC) and drought (10% WHC) conditions, with and without carbon amendments. Drought significantly reduced total microbial biomass (45.3 to 32.3 nmol PLFA g⁻¹, <i>p</i> = 0.021), microbial biomass carbon (215.7 ± 12.4 to 128.5 ± 10.7&#xa0;µg C g⁻¹, <i>p</i> &lt; 0.01), and CO₂ emissions (3.85 ± 0.21 to 2.16 ± 0.18&#xa0;µg CO₂-C g⁻¹ day⁻¹). Dissolved organic carbon decreased from 12.4 ± 1.2 to 7.1 ± 0.9&#xa0;mg C g⁻¹ (<i>p</i> = 0.012). Microbial community structure shifted under drought, with a 41.2% decline in Gram-negative bacteria and increases in Gram-positive bacteria and fungi, indicating enhanced stress tolerance. Carbon use efficiency showed a slight but non-significant increase. Soil organic carbon, nitrogen, and phosphorus were also significantly reduced under drought conditions. These findings demonstrate that drought suppresses microbial activity, alters community composition, and constrains soil carbon and nutrient availability, highlighting potential risks for soil fertility and ecosystem stability under increasing climate stress.</p>

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Drought-induced shifts in soil microbial communities and carbon dynamics in agricultural and forest soils of Bangladesh

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Abdullah Al Mamun

摘要

Drought significantly alters soil microbial activity and carbon cycling, yet its effects across contrasting land-use systems remain insufficiently understood. This study investigated drought-induced changes in microbial communities and carbon dynamics in agricultural and forest soils from Kushtia, Bangladesh, using mesocosm experiments under control (25% WHC) and drought (10% WHC) conditions, with and without carbon amendments. Drought significantly reduced total microbial biomass (45.3 to 32.3 nmol PLFA g⁻¹, p = 0.021), microbial biomass carbon (215.7 ± 12.4 to 128.5 ± 10.7 µg C g⁻¹, p < 0.01), and CO₂ emissions (3.85 ± 0.21 to 2.16 ± 0.18 µg CO₂-C g⁻¹ day⁻¹). Dissolved organic carbon decreased from 12.4 ± 1.2 to 7.1 ± 0.9 mg C g⁻¹ (p = 0.012). Microbial community structure shifted under drought, with a 41.2% decline in Gram-negative bacteria and increases in Gram-positive bacteria and fungi, indicating enhanced stress tolerance. Carbon use efficiency showed a slight but non-significant increase. Soil organic carbon, nitrogen, and phosphorus were also significantly reduced under drought conditions. These findings demonstrate that drought suppresses microbial activity, alters community composition, and constrains soil carbon and nutrient availability, highlighting potential risks for soil fertility and ecosystem stability under increasing climate stress.