文献类型：期刊文献

英文题名：Comparison of different approaches for estimating soil water characteristic curves from saturation to oven dryness

作者：Shang, Li[1];Li, Danfeng[2]

通讯作者：Li, DF[1]

机构：[1]Beijing Union Univ, Dept Fdn Courses, Beijing 100101, Peoples R China;[2]Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China

第一机构：北京联合大学基础教学部

通讯机构：[1]corresponding author), Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China.

年份：2019

卷号：577

外文期刊名：JOURNAL OF HYDROLOGY

收录：;EI(收录号：20193007235384);Scopus(收录号：2-s2.0-85069640779);WOS:【SCI-EXPANDED(收录号:WOS:000488304300044)】；

基金：This study was financially supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA19040500) and the National Natural Science Foundation of China (41701251). The authors sincerely thank the two anonymous reviewers who provided constructive comments and suggestion to improve the quality of this manuscript.

语种：英文

外文关键词：Soil water retention; Pore size distribution; Particle size distribution; Predictive models; Pedotransfer function

摘要：Three approaches were compared for estimating continuous soil water characteristic curves (SWCCs) from easily accessible soil properties. The approaches included combining the Mohammadi and Vanclooster (2011) method (the MV method) with the van Genuchten (1980) model (MV-vG approach), the modified MV-vG approach, and combining the Jensen et al. (2015) method with the Fredlund and Xing (1994) model (the J-FX approach). A total of 195 disturbed soil samples and 195 undisturbed soil cores were collected from 1-m soil profiles in an arid region of northwestern China. Particle size distribution (PSD) and organic matter (OM) content were determined. The volumetric water content and matric potential data pairs of each sample during the drying process were measured using a high speed centrifuge. All of the measured soil properties were used to evaluate the applicability of the approaches for continuous SWCC estimation. The MV method has a robust physical basis and is independent of any experimental SWCC data pairs. Some intrinsic shortcomings affect the estimation of continuous SWCC by the MV-vG approach. The integration of a soil structure feature improved the estimation of the modified MV-vG approach. The estimation of the J-FX approach for SWCC is robust for the five textural classes, and outperformed the MV-vG approach and the modified MV-vG approach. The good performance of the J-FX approach can be attributed in part to the fact that it distinguishes the dominant forces governing water retention of dry and wet ranges, and relates the PSD, specific surface area, and OM content to the pore size distribution. All these factors are vital for soil water retention, but have been simplified or ignored by the MV method. Both the modified MV-vG approach and the J-FX approach are promising for estimating continuous SWCCs at a regional scale. The modified MV-vG approach may be suitable for rigid soils with medium textures at potentials above wilting point. The J-FX approach is applicable for the whole range of water retention from saturation to oven dryness for soils with substantially varying bulk density, soil texture and organic matter content at a regional scale. The results of this study are fundamental for use in simulating the transfer of water and solutes in layered-structured soil profiles and for estimating the vegetation carrying capacity of soil available water in arid regions.