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团聚体粒径分布对土壤导热率的影响
作者:
作者单位:

1.江苏省农业科学院农业资源与环境研究所/农业农村部江苏耕地保育科学观测实验站/国家农业环境六合观测实验站;2.江苏省沿江地区农业科学院

中图分类号:

S152

基金项目:

江苏省重点研发计划（BE2021378）；江苏省卓越博士后计划（2022ZB762）；科研基础调研专项（2021FY100504）


Effect of soil aggregate fractions on thermal conductivity
Author:
Affiliation:

1.Institute of Agricultural Resource and Environment,Jiangsu Academy of Agricultural Sciences/Scientific Observing and Experimental Station of Arable Land Conservation Jiangsu/ National Agricultural Experimental Station for Agricultural Environment Luhe;2.Jiangsu Yanjiang Institute of Agricultural Sciences

Fund Project:

Key Research and Development Program of Jiangsu Province (BE2021378),Jiangsu Funding Program for Excellent Postdoctoral Talent (22ZB762), National Science & Technology Fundamental Resources Investigation Project of China (2021FY100504)

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    摘要:

    本研究采用室内模拟试验，利用热脉冲技术测定大（0.25 ~ 2 mm）、中（0.053 ~ 0.25 mm）、小（< 0.053 mm）团聚体6种配比（100-0-0、0-100-0、0-0-100、50-25-25、25-50-25、25-25-50）的土壤导热率，研究不同团聚体粒径分布下土壤导热率的变化特征。结果表明，含大、中团聚体比例高的干土导热率显著高于含小团聚体比例高的土壤，50-25-25或25-50-25团聚体配比的非饱和土壤导热率和导热率变化速率最低。土壤有机质含量随含中团聚体比例增加而增加。干土导热率与小团聚体比例呈显著线性负相关，土壤导热率变化速率与大、中团聚体比例存在一元二次关系、与有机质含量呈线性负相关。本研究为农田土壤导热率影响因素提供新思路。

    Abstract:

    In this study, a laboratory experiment was conducted to analyze the variation characteristics of soil thermal conductivity (λ) under different soil aggregate fractions. λ were measured for six proportions of large (0.25 ~ 2 mm), medium (0.53 ~ 0.25 mm), and small (< 0.053 mm) aggregates (100-0-0, 0-100-0, 0-0-100, 50-25-25, 25-50-25, and 25-25-50) by using a double-needle heat-pulse probe and time-domain reflectometer technique. Results showed that the λ of soils with a high proportion of large and medium aggregates was significantly lower than that of soils with high proportions of small aggregates; the λ of unsaturated soil and the change rate of λ with aggregate proportions of 50-25-25 or 25-50-25 was the lowest. Soil organic matter content was higher with increasing medium aggregate content. Regression analysis showed a significant linear negative correlation between the λ of dry soil and the proportion of soil small aggregates; a quadratic relationship between the change of λ and the proportion of large or middle aggregates and a negative correlation with soil organic matter content. These findings provide a new idea for the study of factors affecting the λ of farmland soil.

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  • 收稿日期:2024-08-06
  • 最后修改日期:2024-09-12
  • 录用日期:2024-09-18
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