Changes in penetration resistance of Ultisols from southern China as affected by shearing
文献类型：期刊论文
| 作者 | Zhang, B; Horn, R; Baumgartl, T |
| 刊名 | SOIL & TILLAGE RESEARCH
 |
| 出版日期 | 2001 |
| 卷号 | 57期号:4页码:193-202 |
| 关键词 | shearing process penetration resistance soil structure ultisols |
| ISSN号 | 0167-1987 |
| 通讯作者 | Zhang, B() |
| 英文摘要 | 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. |
| 收录类别 | SCI |
| WOS关键词 | SOIL DETACHMENT ; SURFACE ; INFILTRATION ; RAINFALL ; MOISTURE ; IMPACT ; SPLASH |
| WOS研究方向 | Agriculture |
| WOS类目 | Soil Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000166631200002 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2559141 |
| 专题 | 南京土壤研究所 |
| 通讯作者 | Zhang, B |
| 作者单位 | 1.Chinese Acad Sci, Inst Soil Sci, Nanjing 210008, Peoples R China 2.Univ Kiel, Inst Plant Nutr & Soil Sci, D-24118 Kiel, Germany |
| 推荐引用方式 GB/T 7714 | Zhang, B,Horn, R,Baumgartl, T. Changes in penetration resistance of Ultisols from southern China as affected by shearing[J]. SOIL & TILLAGE RESEARCH,2001,57(4):193-202. |
| APA | Zhang, B,Horn, R,&Baumgartl, T.(2001).Changes in penetration resistance of Ultisols from southern China as affected by shearing.SOIL & TILLAGE RESEARCH,57(4),193-202. |
| MLA | Zhang, B,et al."Changes in penetration resistance of Ultisols from southern China as affected by shearing".SOIL & TILLAGE RESEARCH 57.4(2001):193-202. |
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来源：南京土壤研究所
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