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<p>The severity of climate-related issues induced by global warming is escalating. As the largest terrestrial carbon reservoir, soil provides innovative approaches and insight for carbon sequestration and climate mitigation. Adding leaf organic matter to loess can significantly enhances soil organic carbon by storing carbon dioxide in the form of organic carbon. Simultaneously, it alters the internal structure and physical properties of loess by altering the connections between soil particles. This study investigated the effects of organic matter contents (0%~7%) and soil bulk densities (1.28&#xa0;g/cm³~1.85&#xa0;g/cm³) on thermal conductivity and electrical resistivity of loess, and further explored the relationship between those two parameters. The results are as follows: (1) When leaf organic matter content ranged from 0% to 1%, the soil electrical resistivity decreased while the thermal conductivity increased, conversely, when it ranged from 1% to 7%, the trends were reversed; (2) With increasing soil bulk density, soil electrical resistivity decreased while thermal conductivity increased; (3) Soil electrical resistivity and thermal conductivity exhibited an exponential relationship. This study explained the test results from two aspects: the inherent properties of leaf organic matter and the modification of soil internal structure induced by leaf organic matter. The findings are expected to serve as a valuable reference for agriculture activities, heat transfer process in engineering practice, geophysical prospecting analysis, and other related fields.</p>

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Effect of leaf organic matter and soil bulk density on thermal conductivity and electrical resistivity of loess

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Shaoli Liu,
  • Qiang Sun,
  • Rui Lv,
  • He Zhang,
  • Jingjing Nan

摘要

The severity of climate-related issues induced by global warming is escalating. As the largest terrestrial carbon reservoir, soil provides innovative approaches and insight for carbon sequestration and climate mitigation. Adding leaf organic matter to loess can significantly enhances soil organic carbon by storing carbon dioxide in the form of organic carbon. Simultaneously, it alters the internal structure and physical properties of loess by altering the connections between soil particles. This study investigated the effects of organic matter contents (0%~7%) and soil bulk densities (1.28 g/cm³~1.85 g/cm³) on thermal conductivity and electrical resistivity of loess, and further explored the relationship between those two parameters. The results are as follows: (1) When leaf organic matter content ranged from 0% to 1%, the soil electrical resistivity decreased while the thermal conductivity increased, conversely, when it ranged from 1% to 7%, the trends were reversed; (2) With increasing soil bulk density, soil electrical resistivity decreased while thermal conductivity increased; (3) Soil electrical resistivity and thermal conductivity exhibited an exponential relationship. This study explained the test results from two aspects: the inherent properties of leaf organic matter and the modification of soil internal structure induced by leaf organic matter. The findings are expected to serve as a valuable reference for agriculture activities, heat transfer process in engineering practice, geophysical prospecting analysis, and other related fields.