IGSNRR OpenIR
Soil water characteristic curve measurement without bulk density changes and its implications in the estimation of soil hydraulic properties
Fu, Xiaoli1; Shao, Mingan1; Lu, Dianqing2; Wang, Huimin1
2011-11-01
Source PublicationGEODERMA
Volume167-68Pages:1-8
AbstractDuring soil water characteristic curve (SWCC) measurement, bulk density has been found to deviate from in situ values largely because soil first swells during saturation and then shrinks during dehydration. To obtain the actual in situ soil hydraulic properties, there is a need for a method to measure soil hydraulic properties at the in situ bulk density. In this study, we proposed a new method to measure soil hydraulic properties (SWCC and saturated hydraulic conductivity (K(s))) at the in situ bulk density encountered. Bulk density changes during SWCC measurements based on a centrifuge method for loam and clay were characterized, and their effects on soil hydraulic properties at constant bulk densities (expressed with a suffix of "-C") were investigated. Over the pressure head range from 0 to 10,200 cm during conventional SWCC measurement of the centrifuge method, the bulk density increased by 0.49 and 0.40 Mg m(-3) for loam and clay, respectively. K(s)-C decreased by three and four orders of magnitude for loam and clay, respectively, when the corresponding bulk density increased from 1.20 to 1.59 and from 1.35 to 1.54 Mg m(-3). The increase in bulk density during conventional SWCC measurement changed the shape of the SWCC-C. The modeled unsaturated hydraulic conductivities at constant bulk densities presented approximately one and two orders of magnitude differences when the bulk densities increased from 1.40 to 1.59 and from 1.45 to 1.54 Mg m(-3) for loam and clay, respectively. This type of investigation provides a method to obtain soil hydraulic properties at in situ bulk densities and, thus, should aid our understanding of in situ soil water and solute transport. (C) 2011 Elsevier B.V. All rights reserved.
SubtypeArticle
KeywordSoil Water Characteristic Curve Saturated Hydraulic Conductivity Unsaturated Hydraulic Conductivity Bulk Density Swelling Shrinkage
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS Subject ExtendedAgriculture
WOS KeywordSHRINKAGE CURVE ; RETENTION CURVES ; TROPICAL SOILS ; VOLUME-CHANGE ; CONDUCTIVITY ; CENTRIFUGE ; COMPACTION ; RANGE ; MODEL
Indexed BySCI
Language英语
WOS SubjectSoil Science
WOS IDWOS:000298029000001
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/68134
Collection中国科学院地理科学与资源研究所
Corresponding AuthorShao, Mingan
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Qianyanzhou Ecol Stn, Beijing 100101, Peoples R China
2.Hunan Normal Univ, Coll Resources & Environm Sci, Changsha 410081, Hunan, Peoples R China
Recommended Citation
GB/T 7714
Fu, Xiaoli,Shao, Mingan,Lu, Dianqing,et al. Soil water characteristic curve measurement without bulk density changes and its implications in the estimation of soil hydraulic properties[J]. GEODERMA,2011,167-68:1-8.
APA Fu, Xiaoli,Shao, Mingan,Lu, Dianqing,&Wang, Huimin.(2011).Soil water characteristic curve measurement without bulk density changes and its implications in the estimation of soil hydraulic properties.GEODERMA,167-68,1-8.
MLA Fu, Xiaoli,et al."Soil water characteristic curve measurement without bulk density changes and its implications in the estimation of soil hydraulic properties".GEODERMA 167-68(2011):1-8.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Fu, Xiaoli]'s Articles
[Shao, Mingan]'s Articles
[Lu, Dianqing]'s Articles
Baidu academic
Similar articles in Baidu academic
[Fu, Xiaoli]'s Articles
[Shao, Mingan]'s Articles
[Lu, Dianqing]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Fu, Xiaoli]'s Articles
[Shao, Mingan]'s Articles
[Lu, Dianqing]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.