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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, Shuhua; He, Yujie; Guo, Xinlei; Chen, Jianjun; Wu, Qingbai; Qin, Yu; Ding, Yongjian
发表日期	2018
ISSN	1994-0416
EISSN	1994-0424
起始页码	3067
结束页码	3083
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 similar to 55% on average, soil porosity was less than 0.3 m(3) 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.
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS关键词	LAND-SURFACE MODEL ; TERRESTRIAL ECOSYSTEMS ; CARBON ; VEGETATION ; NITROGEN ; CONDUCTIVITY ; IMPACTS ; CLIMATE ; POROSITY ; FREEZE
WOS记录号	WOS:000466147500001
来源期刊	CRYOSPHERE
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/240318
作者单位	[Yi, Shuhua] Nantong Univ, Sch Geog Sci, 999 Tongjing Rd, Nantong 226007, Peoples R China; [Yi, Shuhua; Qin, Yu; Ding, Yongjian] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, 320 Donggang West Rd, Lanzhou 730000, Gansu, Peoples R China; [He, Yujie] Chinese Res Inst Environm Sci, 8 Dayangfang, Beijing 100012, Peoples R China; [Guo, Xinlei] Univ Amsterdam, Inst Biodivers & Ecosyst Dynam, Dept Ecosyst & Landscape Dynam, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands; [Chen, Jianjun] Guilin Univ Technol, Coll Geomat & Geoinformat, 12 Jiangan Rd, Guilin 541004, Peoples R China; [Chen, Jianjun] Guangxi Key Lab Spatial Informat & Geomat, 12 Jiangan Rd, Guilin 541004, Peoples R China; [Wu, Qingbai] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, 320 Donggang West Rd, Lanzhou 730000, Gansu, Peoples R China; [Ding, Yongjian] Chinese Acad Sci, Key Lab Ecohydrol Inland River Basin, Lanzhou 730000, Gansu, Peoples R China; [Ding, Yongjian...
推荐引用方式 GB/T 7714	Yi, Shuhua,He, Yujie,Guo, Xinlei,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]. 中国科学院西北生态环境资源研究院,2018,12(9).
APA	Yi, Shuhua.,He, Yujie.,Guo, Xinlei.,Chen, Jianjun.,Wu, Qingbai.,...&Ding, Yongjian.(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, Shuhua,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).