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<p>Soil carbon sequestration plays a vital role in mitigating greenhouse gas emissions, and its stability is significantly influenced by organic matter content, moisture levels, and temperature conditions. In cold environments, the formation of pore ice and the phase transition between ice and water alter the physical properties of soil, thereby affecting its carbon storage capacity. Thermal conductivity, as a key indicator of soil thermal-physical behavior, can serve as a proxy for evaluating stability changes. This study systematically investigates the evolution of soil thermal conductivity under varying water contents (12–18%), organic matter contents (1–5%), and temperatures (− 20 °C to 10 °C). The results reveal that thermal conductivity is jointly regulated by soil moisture and organic matter, with a distinct nonlinear response. Specifically, as water content increases from 12 to 16%, thermal conductivity rises accordingly, but decreases sharply beyond 16%, with a maximum reduction of up to 36%. At organic matter contents below 3%, thermal conductivity is enhanced; however, above this threshold, the increase in macroporosity leads to a 45–55% reduction in conductivity. Temperature also exerts a significant influence between − 5 and − 15 °C, the freezing of free water enhances heat transfer, resulting in a 29.47% increase in conductivity, whereas in the − 15 °C to − 20 °C range, the formation of pore ice obstructs heat flow paths, limiting the increase to 19.03%. These findings elucidate the coupled effects of temperature, moisture, and organic matter on soil thermal behavior under low-temperature conditions and offer theoretical insights for improving carbon sequestration performance in cold-region soils.</p>

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Study on thermal conductivity of organic soil under low temperature

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Pengda Ma,
  • Qiang Sun,
  • Yongjuan Liu,
  • Rui Lv,
  • Shaoli Liu,
  • Yabin Liu,
  • Jishi Geng,
  • Jingjing Nan

摘要

Soil carbon sequestration plays a vital role in mitigating greenhouse gas emissions, and its stability is significantly influenced by organic matter content, moisture levels, and temperature conditions. In cold environments, the formation of pore ice and the phase transition between ice and water alter the physical properties of soil, thereby affecting its carbon storage capacity. Thermal conductivity, as a key indicator of soil thermal-physical behavior, can serve as a proxy for evaluating stability changes. This study systematically investigates the evolution of soil thermal conductivity under varying water contents (12–18%), organic matter contents (1–5%), and temperatures (− 20 °C to 10 °C). The results reveal that thermal conductivity is jointly regulated by soil moisture and organic matter, with a distinct nonlinear response. Specifically, as water content increases from 12 to 16%, thermal conductivity rises accordingly, but decreases sharply beyond 16%, with a maximum reduction of up to 36%. At organic matter contents below 3%, thermal conductivity is enhanced; however, above this threshold, the increase in macroporosity leads to a 45–55% reduction in conductivity. Temperature also exerts a significant influence between − 5 and − 15 °C, the freezing of free water enhances heat transfer, resulting in a 29.47% increase in conductivity, whereas in the − 15 °C to − 20 °C range, the formation of pore ice obstructs heat flow paths, limiting the increase to 19.03%. These findings elucidate the coupled effects of temperature, moisture, and organic matter on soil thermal behavior under low-temperature conditions and offer theoretical insights for improving carbon sequestration performance in cold-region soils.