| 单词 |
spodic |
| 释义 |
spodic, a. Soil Science.|ˈspɒdɪk|
[f. Gr. σποδ-ός wood ashes, embers + -ic.]
Of a soil horizon: that is an illuvial deposit rich in aluminium oxide and organic matter and usu. also contains iron oxide.
1960Soil Classification (7th Approximation) (U.S. Dept. Agric., Soil Survey Staff) v. 46/2 The spodic horizon is an illuvial accumulation of free sesquioxides accompanied by appreciable amounts of organic carbon, an illuvial accumulation of free iron not accompanied by roughly equivalent amounts of illuvial crystalline clay, or an illuvial accumulation of organic carbon usually if not always accompanied by an accumulation of aluminum combined in some form other than that of the crystalline silicate clays. 1972J. G. Cruickshank Soil Geogr. iii. 91 Podsolisation involves the translocation downward or laterally of iron and aluminium compounds from silicate clays, and their concentration in a specific lower horizon (B2, Bf, or spodic horizon). 1979Nature 4 Oct. 366/2 Soils in this forest are histosols (peat soils) with some spodic (podzolic) characteristics. |
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