Mechanisms of soil vulnerability to compaction of homogenized and recompacted Ultisols
文献类型：期刊论文
| 作者 | Peng, XH; Horn, R; Zhang, B; Zhao, QG |
| 刊名 | SOIL & TILLAGE RESEARCH
 |
| 出版日期 | 2004-04-01 |
| 卷号 | 76期号:2页码:125-137 |
| 关键词 | soil compaction Casagrande's method pre-compression stress pore water pressure Ultisols |
| ISSN号 | 0167-1987 |
| DOI | 10.1016/j.still.2003.09.006 |
| 通讯作者 | Peng, XH(xhpeng@issas.ac.cn) |
| 英文摘要 | Soil compaction is a main cause of soil degradation in the world and the information of soil compaction in subtropical China is limited. Three main Ultisols (quaternary red clay, sandstone and granite) in subtropical China were homogenized to pass through 2 mm sieve and recompacted into soil cores at two bulk densities (1.25 and 1.45 g cm(-3)). The soil cores were equilibrated at different matric potential values (-3, -6 and -30 kPa) before subjected to multi-step compaction tests. Objectives of this study were to determine how different initial soil conditions and loading time intervals influence pre-compression stress and to evaluate an easy measure to determine soil vulnerability to compaction. It became evident that the soil strength indicator, pre-compression stress, was affected by soil texture, initial soil bulk density and matric potential. The coarser the soil texture, the lower the bulk density and the higher the matric potential, the lower was the pre-compression stress. The pre-compression stress decreased exponentially with increasing initial soil water content. Soil water content and air permeability decreased after compaction. The amount of water loss was affected not only by soil texture, bulk density and initial water content but also by loading time interval. These results indicate soil pore structure and hydraulic conductivity changed during compactions. The applied stress corresponding to the highest changes of pore water pressure during compaction had a significant linear relationship with the pre-compression stress (R = 0.88, P < 0.001). The correlation was ascribed to that the changes in pore water pressure describe the dynamics of the interactive effects of soil pore characters and soil water movement during compaction. The results suggested the evaluation of soil vulnerability to compaction have to consider the initial soil condition and an easy method to measure the changes in pore water pressure can be applied to compare soil strength and soil vulnerability to compaction. (C) 2003 Elsevier B.V. All rights reserved. |
| 收录类别 | SCI |
| WOS关键词 | UNSATURATED SOILS ; WATER-CONTENT ; BULK-DENSITY ; COMPRESSION ; ENVIRONMENT ; PRESSURE ; QUALITY |
| WOS研究方向 | Agriculture |
| WOS类目 | Soil Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000220046400005 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2559344 |
| 专题 | 南京土壤研究所 |
| 通讯作者 | Peng, XH |
| 作者单位 | 1.Chinese Acad Sci, Inst Soil Sci, Lab Mat Cycling Pedosphere, 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 | Peng, XH,Horn, R,Zhang, B,et al. Mechanisms of soil vulnerability to compaction of homogenized and recompacted Ultisols[J]. SOIL & TILLAGE RESEARCH,2004,76(2):125-137. |
| APA | Peng, XH,Horn, R,Zhang, B,&Zhao, QG.(2004).Mechanisms of soil vulnerability to compaction of homogenized and recompacted Ultisols.SOIL & TILLAGE RESEARCH,76(2),125-137. |
| MLA | Peng, XH,et al."Mechanisms of soil vulnerability to compaction of homogenized and recompacted Ultisols".SOIL & TILLAGE RESEARCH 76.2(2004):125-137. |
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来源：南京土壤研究所
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