文献类型：期刊文献

英文题名：Changes in the thermal conductivity of soil with different salts

作者：Ju, Zhaoqiang[1] Lu, Sen[2] Guo, Kai[1] Liu, Xiaojing[1]

第一作者：Ju, Zhaoqiang

通信作者：Ju, ZQ[1]

机构：[1]Chinese Acad Sci, Inst Genet & Dev Biol, Ctr Agr Resources Res, Key Lab Agr Water Resources, 286 Huaizhong Rd, Shijiazhuang 050021, Hebei, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China

年份：2023

外文期刊名：JOURNAL OF SOILS AND SEDIMENTS

收录：;Scopus(收录号：2-s2.0-85160868042);WOS:【SCI-EXPANDED(收录号:WOS:000999845500001)】；

基金：This research was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA28010403), Engineering Laboratory for Efficient Utilization of Saline Resources (KFJ-PTXM-017), and National Natural Science Foundation of China (Grant No. 41877019).

语种：英文

外文关键词：Soil thermal conductivity; Salt-affected soil; Soil moisture content; Salt type

摘要：PurposeSoil thermal conductivity (lambda) is an important physical parameter in agricultural, meteorological, and geophysical processes. Few datasets are available for investigating the response of the lambda in soils containing different salts. In this study, we compared the effects of different salt types and contents on the lambda of quartz sand and determined the changes in lambda of various salt-affected soils before and after salt leaching.Materials and methodsQuartz sand and different types of salt with different contents were mixed, and various salt-affected soils were collected. The lambda of different samples with a series of known water contents was determined by using a portable thermal property tester.Results and discussionThe salts did not influence the lambda of the sand in the dry state or at relatively high moisture contents. At intermediate moisture contents, the lambda was lower by 0.11 W m(-1) K-1, 0.07 W m(-1) K-1, and 0.05 W m(-1) K-1 for the sand with chloride, sulfate, and bicarbonate, respectively, than that of soil without the salts. The salinity insignificantly influenced the lambda of the sand with 3-9 g kg(-1) salts when the salt content in the sand was greater than 3 g kg(-1) for most salt types. The effects of salt type on the decrease in lambda followed the order of chloride > sulfate > bicarbonate. The lambda of quartz sand with added CaCl2 and KCl decreased the greatest, followed by soil with NaCl and MgCl2. After washing away salts, lambda increased significantly by 13.1% and by 15.1% for the saline soil with a large amount of sodium chloride and for the soils characterized by strong chloride-sulfate with a medium moisture content, respectively. A slight difference in the lambda was observed for sodic soil with a relatively high bicarbonate content.ConclusionsThe effects of salts in soil on lambda were different with different water contents. At intermediate water content, the lambda decreased to various degrees in various saline soils. The lambda decreased significantly for the soil with chloride salts. This study aimed to support the qualification of the thermal regime and the modeling of coupled heat and water transfer in salinized soil.