Changes in penetration resistance of Ultisols from southern China as affected by shearing

Zhang, B., Horn, R. and Baumgartl, T. (2001) Changes in penetration resistance of Ultisols from southern China as affected by shearing. Soil & Tillage Research, 57 4: 193-202. doi:10.1016/S0167-1987(00)00148-3

Author Zhang, B.
Horn, R.
Baumgartl, T.
Title Changes in penetration resistance of Ultisols from southern China as affected by shearing
Journal name Soil & Tillage Research   Check publisher's open access policy
ISSN 0167-1987
Publication date 2001
Sub-type Article (original research)
DOI 10.1016/S0167-1987(00)00148-3
Volume 57
Issue 4
Start page 193
End page 202
Total pages 10
Place of publication Amsterdam
Publisher Elsevier Science Bv
Language eng
Abstract Shear stresses and soil properties modified due to stress play an important role during formation of seals in a series of rainfall events and during tillage. The objectives of the study were to evaluate the effects of the penetrometer geometry on the penetration resistance as affected by shearing under different initial soil conditions and to use the information on soil strength to elucidate shearing process. Nine homogenous air-dried soils (<2 mm) were sprayed and stored so as to obtain equilibrium soil water contents. The moist soils were sheared by horizontal displacement of layers of soil particles/aggregates in between hands in one direction. The soil cores were prepared with comparable bulk density before the measurement of maximum penetration resistance (P-max) with a small flat rip and a cone tip penetrometers. At a wide range from 0.05 to 6.2 MPa, P-max was linearly correlated between the small flat tip and the cone tip penetrometers. The conversion ratio was higher under the saturation condition irrespective of the shearing effect. The penetrometer with the small flat tip was more sensitive for the weak soils. Shearing generally increased P-max in most cases, but it decreased P-max for some sandy soils under both saturated and unsaturated conditions and for a clayey soil under the saturated condition. The soil consisting of swelling clay exerted a decrease in P-max. Rearrangement and/or sliding of particles/aggregates and increase in soil suction during shearing were attributed to the increase in P-max. Increase in porosity due to the aggregation during shearing was ascribed to the decrease in P-max. In addition, it was shown that agricultural cultivation resulted in a reduction in soil strength. (C) 2001 Elsevier Science B.V. All rights reserved.
Keyword Soil Science
shearing process
penetration resistance
soil structure
Soil Detachment
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Mined Land Rehabilitation Publications
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Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 3 times in Scopus Article | Citations
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Created: Wed, 17 Oct 2007, 11:20:53 EST