IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2009  > Vol6 No.2
Micromorphology of surface crusts in the Knersvlakte, South Africa
Fox, Sarah-Jane C.; Mills, Anthony J.; Poch, Rosa M.
Corresponding AuthorMills, AJ
2009-06
Source PublicationJOURNAL OF MOUNTAIN SCIENCE
ISSN1672-6316
Volume6Issue:2Pages:189–196
AbstractSoils 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.
KeywordInfiltrability Optical Microscopy Porosity Air Vesicles
Language英语
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/6020
CollectionJournal of Mountain Science _Journal of Mountain Science-2009_Vol6 No.2
Recommended Citation
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.
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