| 单词 |
planosol |
| 释义 |
planosol Soil Sci.|ˈpleɪnəʊ-, ˈplænəʊsɒl|
[f. plano-1 + -sol.]
An intrazonal soil having a thin, strongly leached surface horizon over-lying a compacted hard-pan or clay-pan, and occurring on flat uplands with poor drainage. Hence planoˈsolic a.
1938M. Baldwin et al. in U.S. Dept. Agric. Yearbk. 991 The term ‘Planosol’ is being proposed to cover those soils with claypans and cemented hardpans not included with the Solonetz, Ground-Water Podzol, and Ground-Water Laterite. Families of Planosols correspond to associated normal zonal soils. 1965B. T. Bunting Geogr. of Soil vi. 71 Inward from these marginal sites, on plateaux, developed zonal soils occur, of considerable age, and hydromorphic or planosolic variants may exist in the central, poorly drained parts of the widest crestal plateaux. Ibid. xi. 133 Planosols are widespread on level plateau surfaces or broad gentle slopes on loess, till or wide alluvial terraces in central USA. 1972C. B. Hunt Geol. of Soils ix. 206 In southern Ohio, Indiana, and Illinois..are flat, poorly drained uplands covered partly by loess and partly by Illinoian till... The comparatively thin modern soils on the surface of the old weathered deposits are Planosols with light-colored surface layers and deeper layers mottled brown and reddish brown. |
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