词条 | Planosol |
释义 | Planosol FAO soil group ![]() The characteristic clay-rich layer of Planosols can form from a downward translocation (migration) of clay particles under the action of percolating water, from burial of a clay-rich layer by over-washed coarse material, or from seasonal destruction and translocation of clay (a process known as ferrolysis). The clay layer thus may lie under an extensively leached (and hence nutrient-poor) layer. Planosols are related to the Alfisols (Alfisol) and Ultisols (Ultisol) of the U.S. Soil Taxonomy. Related FAO soil groups also exhibiting clay migration are Luvisols (Luvisol) and Albeluvisols (Albeluvisol). |
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