Root-induced changes in soil thermal and dielectric properties should not be ignored
Root-induced changes in soil thermal and dielectric properties should not be ignored
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DOI：
10.1016/j.geoderma.2020.114352
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发表时间：
2020-07-01
期刊：
影响因子：
6.1
通讯作者：
Ren, Tusheng
中科院分区：
文献类型：
--
作者：
Fu, Yongwei;Lu, Yili;Ren, Tusheng
目前对根系介导的土壤物理性质变化缺乏定量的认识。本文研究了玉米根系对根区土壤热容量（C）、导热系数（λ）和介电常数（ε）的影响。从玉米第8叶期至乳熟期，在不同深度和水平位置采集根区土芯，用热时域反射技术测定了样品的碳、λ和λ。改进的C，λ，并包括根的影响，ESTA模型进行了开发和验证。根效应对C、lambda和lambda的影响的模式和大小一般遵循根分布的配置。平均而言，根的存在导致土壤C，λ和λ分别增加8.8%，7.1%和13.6%。对于根区土壤，根系对土壤热物性和介电常数的影响是显着的，可以定量地描述所提出的模型。
There is a lack of quantitative understandings on root-mediated changes of soil physical properties. Here we investigated the influences of maize roots on soil heat capacity (C), thermal conductivity (lambda) and dielectric constant (epsilon) of the root zone. Root-zone soil cores were collected at different depths and horizontal positions from the eighth leaf to milk stage of maize, and C, lambda, and epsilon of the samples were measured with the thermo-TDR technique. Improved C, lambda, and epsilon models that included the influences of roots were developed and validated. The patterns and magnitudes of root effects on C, lambda, and epsilon generally followed the configurations of root distribution. On average, the presence of roots caused increases in soil C, lambda, and epsilon by 8.8%, 7.1% and 13.6%, respectively. For the root-zone soils, root influences on thermal properties and dielectric constant were significant and could be described quantitatively by using the proposed models.