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<p>Purple soil is representative of sediment-derived soils that are widely distributed worldwide. Wildfire-induced high temperatures alter its inherent properties. However, the physicochemical variations of purple soil following thermal degradation, as well as targeted post-fire land management strategies under different fire intensities, remain insufficiently understood. This study hypothesizes that soil physicochemical properties exhibit threshold-dependent degradation behavior along fire temperature gradients, corresponding to differentiated post-fire restoration requirements. To address this, soil samples were subjected to controlled thermal treatments (20–1000&#xa0;°C) in laboratory-simulated experiments, and variations in physicochemical properties were systematically analyzed. Soil morphology, particle characteristics, fertility parameters (e.g., organic carbon, pH), and chemical composition were selected as core indicators to quantify soil thermal responses. The results demonstrate that soil responses to thermal disturbance exhibit distinct threshold behaviors rather than linear trends. These transitions are primarily governed by progressive transformations of organic components, clay minerals and carbonate phases, which collectively regulate soil structural stability and nutrient retention capacity. Based on these mechanistic insights, a conceptual framework is proposed linking fire-induced thermal damage thresholds to tentative restoration requirements. The findings indicate that post-fire soil recovery strategies should be differentiated according to degradation mechanisms rather than uniform management practices. Importantly, the identified composition-controlled threshold behavior suggests that the proposed framework is transferable to other soil systems with similar chemical compositions, providing a generalized basis for assessing wildfire impacts and supporting post-fire land management in fire-prone regions worldwide. These threshold insights establish previously overlooked interdisciplinary connections, provide promising restoration prospects, and guide future research directions.</p>

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Thermal damage thresholds of soil resources: implications for targeted post-fire land management

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • Qiyong Zhang,
  • Shiji Wang,
  • Xian Li,
  • Anjun Li,
  • Bingxiang Yuan,
  • Jun Bi

摘要

Purple soil is representative of sediment-derived soils that are widely distributed worldwide. Wildfire-induced high temperatures alter its inherent properties. However, the physicochemical variations of purple soil following thermal degradation, as well as targeted post-fire land management strategies under different fire intensities, remain insufficiently understood. This study hypothesizes that soil physicochemical properties exhibit threshold-dependent degradation behavior along fire temperature gradients, corresponding to differentiated post-fire restoration requirements. To address this, soil samples were subjected to controlled thermal treatments (20–1000 °C) in laboratory-simulated experiments, and variations in physicochemical properties were systematically analyzed. Soil morphology, particle characteristics, fertility parameters (e.g., organic carbon, pH), and chemical composition were selected as core indicators to quantify soil thermal responses. The results demonstrate that soil responses to thermal disturbance exhibit distinct threshold behaviors rather than linear trends. These transitions are primarily governed by progressive transformations of organic components, clay minerals and carbonate phases, which collectively regulate soil structural stability and nutrient retention capacity. Based on these mechanistic insights, a conceptual framework is proposed linking fire-induced thermal damage thresholds to tentative restoration requirements. The findings indicate that post-fire soil recovery strategies should be differentiated according to degradation mechanisms rather than uniform management practices. Importantly, the identified composition-controlled threshold behavior suggests that the proposed framework is transferable to other soil systems with similar chemical compositions, providing a generalized basis for assessing wildfire impacts and supporting post-fire land management in fire-prone regions worldwide. These threshold insights establish previously overlooked interdisciplinary connections, provide promising restoration prospects, and guide future research directions.