Micromorphology of surface crusts in the Knersvlakte, South Africa
文献类型：期刊论文
| 作者 | Fox, Sarah-Jane C. ; Mills, Anthony J. ; Poch, Rosa M. |
| 刊名 | JOURNAL OF MOUNTAIN SCIENCE
 |
| 出版日期 | 2009-06 |
| 卷号 | 6期号:2页码:189–196 |
| 关键词 | Infiltrability optical microscopy porosity air vesicles |
| ISSN号 | 1672-6316 |
| 通讯作者 | Mills, AJ |
| 英文摘要 | Soils in the Knersvlakte are particularly prone to crusting and have lower inherent infiltrability than other soils across western southern Africa. Micromorphological techniques were used to examine the structure and porosity of soil crusts in the Knersvlakte to ascertain why crusting is so intense in this region. Quantile regression using boundary lines was employed to examine the relationships between infiltrability and soil properties for all samples (n = 67). This analysis showed that infiltrability is potentially maximal at low waterdispersible 'clay plus silt' content and low silt content (r(2) = 0.72 and 0.64; respectively, n = 67) (Figure 2). The strength of crusts, pH, EC, clay mineralogy, and water-dispersible clay, silt and 'clay plus silt' content were compared, and a pore analysis using optical microscopy was undertaken on images of six soil thin sections (n = 6) (circular and parallel polarizers). Pore analysis was further undertaken on five horizontal slices of equal dimensions taken through each soil thin section. The porosity samples with low infiltrability (< 100 mm center dot hr(-1), n = 4) had greater crust strength, lower porosity (both total and in the least porous slice) and greater water-dispersible 'clay plus silt' and silt content than the porosity samples with high infiltrability (/s > 100 mm center dot hr(-1), n = 2). The porosity samples with low infiltrability showed a trend of lower pH and greater water dispersible clay percentage. Porosity varied within the porosity samples due to the presence of dense clay/silt bands (< 0.5 mm in width) with relatively few air vesicles. The porosity samples with horizontal slices of low porosity (but large numbers of air vesicles) had low infiltrability, while those without slices of low porosity (and relatively few air vesicles) had high infiltrability. We conclude that the intense crusting and resultant low infiltrability of soils in the Knersvlakte appears to be related to the formation of thin, dense clay/silt bands in the pedoderm. |
| 语种 | 英语 |
| 公开日期 | 2013-08-14 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/6020]  |
| 专题 | 成都山地灾害与环境研究所_Journal of Mountain Science _Journal of Mountain Science-2009_Vol6 No.2 |
| 推荐引用方式 GB/T 7714 | Fox, Sarah-Jane C.,Mills, Anthony J.,Poch, Rosa M.. Micromorphology of surface crusts in the Knersvlakte, South Africa[J]. JOURNAL OF MOUNTAIN SCIENCE,2009,6(2):189–196. |
| APA | Fox, Sarah-Jane C.,Mills, Anthony J.,&Poch, Rosa M..(2009).Micromorphology of surface crusts in the Knersvlakte, South Africa.JOURNAL OF MOUNTAIN SCIENCE,6(2),189–196. |
| MLA | Fox, Sarah-Jane C.,et al."Micromorphology of surface crusts in the Knersvlakte, South Africa".JOURNAL OF MOUNTAIN SCIENCE 6.2(2009):189–196. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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