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DOI	10.5194/tc-12-3067-2018
	The physical properties of coarse-fragment soils and their effects on permafrost dynamics: A case study on the central Qinghai-Tibetan Plateau
	Yi S.; He Y.; Guo X.; Chen J.; Wu Q.; Qin Y.; Ding Y.
发表日期	2018
ISSN	19940416
卷号	12 期号:9
英文摘要	Soils on the Qinghai-Tibetan Plateau (QTP) have distinct physical properties from agricultural soils due to weak weathering and strong erosion. These properties might affect permafrost dynamics. However, few studies have investigated both quantitatively. In this study, we selected a permafrost site on the central region of the QTP and excavated soil samples down to 200 cm. We measured soil porosity, thermal conductivity, saturated hydraulic conductivity, and matric potential in the laboratory. Finally, we ran a simulation model replacing default sand or loam parameters with different combinations of these measured parameters. Our results showed that the mass of coarse fragments in the soil samples (diameter > 2 mm) was ∼ 55 % on average, soil porosity was less than 0.3 m3 m-3, saturated hydraulic conductivity ranged from 0.004 to 0.03 mm s-1, and saturated matric potential ranged from-14 to-604 mm. When default sand or loam parameters in the model were substituted with these measured values, the errors of soil temperature, soil liquid water content, active layer depth, and permafrost lower boundary depth were reduced (e.g., the root mean square errors of active layer depths simulated using measured parameters versus the default sand or loam parameters were about 0.28, 1.06, and 1.83 m). Among the measured parameters, porosity played a dominant role in reducing model errors and was typically much smaller than for soil textures used in land surface models. We also demonstrated that soil water dynamic processes should be considered, rather than using static properties under frozen and unfrozen soil states as in most permafrost models. We conclude that it is necessary to consider the distinct physical properties of coarse-fragment soils and water dynamics when simulating permafrost dynamics of the QTP. Thus it is important to develop methods for systematic measurement of physical properties of coarse-fragment soils and to develop a related spatial data set for porosity. © 2018 Author(s).
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119061
作者单位	School of Geographic Sciences, Nantong University, 999 Tongjing Road, Nantong, 226007, China; State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 320 Donggang West Road, Lanzhou, Gansu, 730000, China; Chinese Research Academy of Environmental Sciences, No.8 Dayangfang, Chaoyang District, Beijing, 100012, China; Department of Ecosystem and Landscape Dynamics, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Science Park 904, XH Amsterdam, 1098, Netherlands; College of Geomatics and Geoinformation, Guilin University of Technology, 12 Jiangan Road, Guilin, 541004, China; Guangxi Key Laboratory of Spatial Information and Geomatics, 12 Jiangan Road, Guilin, 541004, China; State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 320 Donggang West Road, Lanzhou, Gansu, 730000, China; Key Laboratory of Ecohydrology of Inland River Basin,...
推荐引用方式 GB/T 7714	Yi S.,He Y.,Guo X.,et al. The physical properties of coarse-fragment soils and their effects on permafrost dynamics: A case study on the central Qinghai-Tibetan Plateau[J],2018,12(9).
APA	Yi S..,He Y..,Guo X..,Chen J..,Wu Q..,...&Ding Y..(2018).The physical properties of coarse-fragment soils and their effects on permafrost dynamics: A case study on the central Qinghai-Tibetan Plateau.Cryosphere,12(9).
MLA	Yi S.,et al."The physical properties of coarse-fragment soils and their effects on permafrost dynamics: A case study on the central Qinghai-Tibetan Plateau".Cryosphere 12.9(2018).