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<p>Microbial respiration (Rm) and its temperature sensitivity play a crucial role in soil organic carbon (SOC) dynamics under climate change. Although vegetation restoration is considered an effective strategy to enhance SOC storage, the persistence of this carbon pool under warming depends on Rm responses. In addition, the effects of vegetation restoration on microbial respiration and its temperature sensitivity in karst regions remain unclear, and the mechanisms across different restoration modes have not been systematically investigated.&#xa0;We selected a representative karst region in southwestern China and examined three land-use types: cropland (CL), plantation forests on abandoned farmland (PF), and naturally regenerated secondary forests (SF), using a randomized block design. Soil samples were incubated under controlled laboratory conditions to measure cumulative microbial respiration and its temperature sensitivity.&#xa0;Natural restoration significantly increased microbial respiration, while artificial restoration enhanced the sensitivity of Rm to temperature. Vegetation restoration increased microbial respiration mainly through greater carbon input and elevated Rm sensitivity by reducing SOC mineral protection. Compared with artificial restoration, natural restoration increased SOC stocks but reduced the temperature sensitivity of SOC decomposition.&#xa0;Vegetation restoration exerts distinct effects on microbial respiration and its temperature sensitivity in karst regions. These findings highlight that different restoration modes influence SOC stability through contrasting mechanisms, providing guidance for climate-resilient land management.</p> Graphical Abstract <p></p>

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Vegetation Restoration Increases Soil Carbon Storage but Enhances Temperature Sensitivity of Microbial Respiration in a Subtropical Karst Region

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Linjun Shen,
  • Yong Huang,
  • Dejun Li,
  • Xiaoyu Peng,
  • Yalong Kang

摘要

Microbial respiration (Rm) and its temperature sensitivity play a crucial role in soil organic carbon (SOC) dynamics under climate change. Although vegetation restoration is considered an effective strategy to enhance SOC storage, the persistence of this carbon pool under warming depends on Rm responses. In addition, the effects of vegetation restoration on microbial respiration and its temperature sensitivity in karst regions remain unclear, and the mechanisms across different restoration modes have not been systematically investigated. We selected a representative karst region in southwestern China and examined three land-use types: cropland (CL), plantation forests on abandoned farmland (PF), and naturally regenerated secondary forests (SF), using a randomized block design. Soil samples were incubated under controlled laboratory conditions to measure cumulative microbial respiration and its temperature sensitivity. Natural restoration significantly increased microbial respiration, while artificial restoration enhanced the sensitivity of Rm to temperature. Vegetation restoration increased microbial respiration mainly through greater carbon input and elevated Rm sensitivity by reducing SOC mineral protection. Compared with artificial restoration, natural restoration increased SOC stocks but reduced the temperature sensitivity of SOC decomposition. Vegetation restoration exerts distinct effects on microbial respiration and its temperature sensitivity in karst regions. These findings highlight that different restoration modes influence SOC stability through contrasting mechanisms, providing guidance for climate-resilient land management.

Graphical Abstract