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<p>Wetlands store large soil carbon (C) pools but remain understudied with respect to how labile C inputs regulate microbial community dynamics and C cycling under climate warming. Here, we conducted a labile C (glucose) addition experiment in soils from Zhalong, Momoge, and Xianghai wetlands (Songnen Plain, China) to test two hypotheses: (1) Labile C input alleviates C limitation and increases microbial respiration and <i>Q</i><sub>10</sub>; (2) Labile C enrichment shifts microbial communities toward r-strategists (copiotrophs). The results showed that labile C significantly stimulated respiration rate and <i>Q</i><sub>10</sub>, especially in topsoil (0–15 cm). It increased bacterial abundance and bacteria-to-fungi ratio, enhanced carbohydrate utilization, and reduced polymer C use, indicating a shift to r-strategists. Labile C addition significantly increased the activities of β-1,4-glucosidase and the contents of soil NH<sub>4</sub><sup>+</sup>-N, NO<sub>3</sub><sup>−</sup>-N. Structural equation modeling showed that soil microbial C metabolic activity positively regulated <i>Q</i><sub>10</sub> and microbial strategy shifts. These findings demonstrate that labile C availability governs microbial thermal responses and life-history strategies in C-limited wetland soils. This study improves mechanistic understanding of wetland C-limited feedbacks and supports evidence-based wetland management under global warming.</p>

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Labile carbon inputs regulate microbial respiration temperature sensitivity and survival strategies in wetland soils

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Shouyang Luo,
  • Zhendi Liu,
  • Yanyu Song,
  • Mengyuan Zhu,
  • Jia Qi,
  • Yiting Zhao,
  • Huanhuan Feng,
  • Fangcong Fu,
  • Changchun Song

摘要

Wetlands store large soil carbon (C) pools but remain understudied with respect to how labile C inputs regulate microbial community dynamics and C cycling under climate warming. Here, we conducted a labile C (glucose) addition experiment in soils from Zhalong, Momoge, and Xianghai wetlands (Songnen Plain, China) to test two hypotheses: (1) Labile C input alleviates C limitation and increases microbial respiration and Q10; (2) Labile C enrichment shifts microbial communities toward r-strategists (copiotrophs). The results showed that labile C significantly stimulated respiration rate and Q10, especially in topsoil (0–15 cm). It increased bacterial abundance and bacteria-to-fungi ratio, enhanced carbohydrate utilization, and reduced polymer C use, indicating a shift to r-strategists. Labile C addition significantly increased the activities of β-1,4-glucosidase and the contents of soil NH4+-N, NO3−-N. Structural equation modeling showed that soil microbial C metabolic activity positively regulated Q10 and microbial strategy shifts. These findings demonstrate that labile C availability governs microbial thermal responses and life-history strategies in C-limited wetland soils. This study improves mechanistic understanding of wetland C-limited feedbacks and supports evidence-based wetland management under global warming.