单词 | podzol |
释义 | podzoln. Soil Science. An acidic, generally infertile soil which is characterized by a well-marked white or grey subsurface layer resembling ash, from which minerals have been leached into a lower dark-coloured layer, and which occurs esp. under coniferous trees or heath vegetation in moist, usually temperate climates (typically in parts of northern Russia). Originally: spec. the white or grey layer alone. ΘΚΠ the world > the earth > structure of the earth > constituent materials > earth or soil > kind of earth or soil > [noun] > other soils white earth1448 Chiltern?1530 light land1589 deads1653 rosil1691 moorland1753 prairie soil1817 residuum1828 rendzina1905 podzol1908 solonetz1924 solod1925 solonchak1925 pedalfer1928 pedocal1928 skeletal soil1932 peloid1933 sierozem1934 planosol1938 lithosol1939 regosol1949 andosol1958 Alfisol1960 Aridisol1960 Histosol1960 Spodosol1960 Andisol1978 1906 E. W. Hilgard Soils x. 186 Woodlands of northern countries bearing beech and oak are especially apt to be benefited by the action of lime on the ‘raw’, acid humous soil and underlying hardpan, which is commonly under~laid by a leaden-blue sandy subsoil (‘Bleisand’ of the Germans, ‘Podzol’ of the Russians) colored brown by earth humates.] 1908 Jrnl. Agric. Sci. 3 83 The most characteristic feature of the Podzol..is the dissolution and removal of soluble parts of silicates..and an increase in the percentage of insoluble silica. 1927 C. F. Marbut tr. K. D. Glinka Great Soil Groups 71 All these profiles of Russian soils belong to the Podsols [Ger. Podsolen]. This term is used to designate soils which have a pronounced and well developed whitish A2 horizon. If this horizon is not well developed, and the corresponding horizon contains whitish specks and stringers the soil is said to be Podsolic. 1934 Forestry 8 25 Podzol soils owe their name to the presence of an ashy-grey layer which underlies the surface layer of dead vegetation and plant roots. 1946 F. E. Zeuner Dating Past v. 124 Brownearth and podsol soils are characteristic of the humid-temperate countries. 1973 Sci. Amer. Dec. 64/2 The tropical podzols are useless even for shifting agriculture; the Dayak peoples of Borneo call them kerangas: ‘land on which one cannot grow rice’. 2004 Biogeochemistry 68 1 In winter, however, [percentage] conifer cover had a positive effect, while higher temperature and higher humus iron podzol cover had negative influences. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < |
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