干旱区生态环境知识资源中心(Arid): Mechanisms and processes affecting aggregate stability and saturated hydraulic conductivity of top and sublayers in semi-arid soils

Arid

DOI	10.1016/j.geoderma.2021.115304
	Mechanisms and processes affecting aggregate stability and saturated hydraulic conductivity of top and sublayers in semi-arid soils
	Tanner, Smadar; Katra, Itzhak; Argaman, Eli; Ben-Hur, Meni
通讯作者	Tanner, S (corresponding author), Ben Gurion Univ Negev, Dept Geog & Environm Dev, IL-8410501 Beer Sheva, Israel.
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2021
卷号	404
英文摘要	Soils are turned over during agronomic and environmental activities, such that the sublayer becomes the topsoil. Because subsoils have been subjected to high pressures over long periods in the field, their activities and functionality can be changed when they are shifted to the top layer. The present work objective was to investigated the mechanisms and processes affecting the structural stability, and consequently saturated hydraulic conductivity (K-s), of a semi-arid soils, which were taken from < 0.3 m depth (top soils) and > 0.3 m depth (sublayers soils). Disturbed soil samples, with similar aggregate-size distribution and bulk densities, were packed in columns, prewetted with saline solution (SS), and then their K-s values were determined during consecutive leaching with SS and deionized water (DI). The K-s values of the various soils under SS leaching differed due to slaking and swelling processes that changed the soil structure. The effect of the slaking process on K-s reduction was more significant in the top-than sublayer soils. Soil swelling under SS wetting and leaching caused mainly by penetration of water molecules into capillary pores in the soil that increases the pores volumes, and enlarges the aggregate swelling (matrix-type swelling). The average bulk density, and consequently the structural strength, of the aggregates in the sublayer soils were significantly higher than that of the top soils. This suggested that, under matrix-type swelling, less aggregates would be broken in the sublayer than in the top-layer soils. During leaching of the top and the sublayer soils with DI, the aggregates breakdown and K-s reduction were caused mainly by dispersion and osmotic swelling of the clay fractions in the soil. In this case, a negative relationship between the K-s and SAR values was obtained, regardless of the soil depths.
英文关键词	Aggregate stability Aggregate bulk density Hydraulic conductivity Matrix swelling Slaking Sublayer soil
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000700886000026
WOS关键词	ORGANIC-MATTER ; SEAL FORMATION ; ELECTROLYTE CONCENTRATION ; NA-MONTMORILLONITE ; CLAY DISPERSION ; LAND-USE ; SALINE ; SIZE ; INFILTRATION ; ERODIBILITY
WOS类目	Soil Science
WOS研究方向	Agriculture
来源机构	Ben-Gurion University of the Negev
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363388
作者单位	[Tanner, Smadar; Katra, Itzhak] Ben Gurion Univ Negev, Dept Geog & Environm Dev, IL-8410501 Beer Sheva, Israel; [Tanner, Smadar; Ben-Hur, Meni] Agr Res Org ARO, Inst Soil Water & Environm Sci, Volcani Ctr, POB 15159, IL-7505101 Rishon Leziyyon, Israel; [Argaman, Eli] Minist Agr, Volcani Ctr, ARO, Soil Eros Res Stn, POB 15159, IL-7505101 Rishon Leziyyon, Israel
推荐引用方式 GB/T 7714	Tanner, Smadar,Katra, Itzhak,Argaman, Eli,et al. Mechanisms and processes affecting aggregate stability and saturated hydraulic conductivity of top and sublayers in semi-arid soils[J]. Ben-Gurion University of the Negev,2021,404.
APA	Tanner, Smadar,Katra, Itzhak,Argaman, Eli,&Ben-Hur, Meni.(2021).Mechanisms and processes affecting aggregate stability and saturated hydraulic conductivity of top and sublayers in semi-arid soils.GEODERMA,404.
MLA	Tanner, Smadar,et al."Mechanisms and processes affecting aggregate stability and saturated hydraulic conductivity of top and sublayers in semi-arid soils".GEODERMA 404(2021).