气候变化领域集成服务门户(CCPortal): Experimental Study on Thermal Conductivity of Organic-Rich Soils under Thawed and Frozen States

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DOI	10.1155/2021/7566669
	Experimental Study on Thermal Conductivity of Organic-Rich Soils under Thawed and Frozen States
	He, Ruixia; Jia, Ning; Jin, Huijun; Wang, Hongbo; Li, Xinyu
通讯作者	Jin, HJ (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soils Engn, Lanzhou 73000, Peoples R China. ; Jin, HJ (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Da Xinganling Observat & Res Stn Frozen Ground En, Lanzhou 73000, Peoples R China. ; Jin, HJ (通讯作者)，Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Peoples R China. ; Jin, HJ (通讯作者)，Northeast Forestry Univ, Minist Educ, Sch Civil Engn, Inst Cold Reg Sci & Engn, Harbin 150040, Peoples R China. ; Jin, HJ (通讯作者)，Northeast Forestry Univ, Minist Educ, Northeast China Observ & Res Stn Permafrost Geoen, Harbin 150040, Peoples R China.
发表日期	2021
ISSN	1468-8115
EISSN	1468-8123
卷号	2021
英文摘要	Thermal properties are important for featuring the water-heat transfer capacity of soil. They are also key to many processes in earth sciences, such as the land surface processes and ecological and geoenvironmental dynamics and their changes in permafrost regions. With loose and porous structures, the organic matter layer in soil strata substantially influences soil thermal conductivity. So far, thermal conductivity of mineral soils has been explored extensively and in depth, but there are only limited studies on that of organic soils. In this study, influences of soil temperature, soil moisture saturation (SMS), and soil organic matter (SOM) content on soil thermal conductivity were analyzed on the basis of laboratory experiments on the silt-organic soil mixtures of varied mixing ratios. Results show that soil thermal conductivity declines slowly with the lowering temperatures from 10 to 0 degrees C; however, it increases and finally stabilizes when temperature further lowers from 0 to -10 degrees C. It is important to note that thermal conductivity peaks in the temperature range of -2 similar to 0 degrees C (silty and organic-poor soil) and -5 similar to 0 degrees C (organic-rich soil), possibly due to phase changes of ice/water in warm permafrost. Under both thawed and frozen states, soil thermal conductivity is positively related with SMS. However, with rising SOM content, the growth rate of soil thermal conductivity with SMS slows gradually. Given the same SMS, soil thermal conductivity declines exponentially with increasing SOM content. Based on the experimental and theoretical analyses, a new empirical computational formula of soil thermal conductivity is established by taking into account of the SOM content, SMS, and soil temperature. The results may help better parameterize in simulating and predicting land surface processes and for optimizing frozen soil engineering designs and provide theoretical bases for exploring the dynamic mechanisms of environmental changes in cold regions under a changing climate.
关键词	MODEL UNFROZEN HEAT
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Geology
WOS类目	Geochemistry & Geophysics ; Geology
WOS记录号	WOS:000703328100002
来源期刊	GEOFLUIDS
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253897
作者单位	[He, Ruixia; Jin, Huijun] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soils Engn, Lanzhou 73000, Peoples R China; [He, Ruixia; Jin, Huijun] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Da Xinganling Observat & Res Stn Frozen Ground En, Lanzhou 73000, Peoples R China; [Jia, Ning; Jin, Huijun; Li, Xinyu] Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Peoples R China; [Jin, Huijun] Northeast Forestry Univ, Minist Educ, Sch Civil Engn, Inst Cold Reg Sci & Engn, Harbin 150040, Peoples R China; [Jin, Huijun] Northeast Forestry Univ, Minist Educ, Northeast China Observ & Res Stn Permafrost Geoen, Harbin 150040, Peoples R China; [Wang, Hongbo] Tianshui Normal Univ, Sch Civil Engn, Tianshui 741001, Gansu, Peoples R China
推荐引用方式 GB/T 7714	He, Ruixia,Jia, Ning,Jin, Huijun,et al. Experimental Study on Thermal Conductivity of Organic-Rich Soils under Thawed and Frozen States[J]. 中国科学院西北生态环境资源研究院,2021,2021.
APA	He, Ruixia,Jia, Ning,Jin, Huijun,Wang, Hongbo,&Li, Xinyu.(2021).Experimental Study on Thermal Conductivity of Organic-Rich Soils under Thawed and Frozen States.GEOFLUIDS,2021.
MLA	He, Ruixia,et al."Experimental Study on Thermal Conductivity of Organic-Rich Soils under Thawed and Frozen States".GEOFLUIDS 2021(2021).