![]() They lack the diagnostic properties specified for soils of other orders. They occur in a wide range of climatic and vegetative environments including Boreal Forest mixed forest, shrubs, and grass and heath and tundra.īrunisolic soils have a Bm, Bfj, thin Bf, or Btj horizon at least 5 cm thick. Most Brunisolic soils are well to imperfectly drained, but some that have been affected by seepage water are poorly drained although not strongly gleyed. Soils having a Bf horizon less than 10 cm thick are a part of this order.Ī Bm horizon may have any or all of the following: stronger chroma and redder hue than the underlying material, partial or complete removal of carbonates, slight illuviation based mainly on the occurrence of an overlying Ae horizon, a change in structure from that of the original material.Ī Bm horizon may develop in materials of any color, such as gray, brown, black or red, and which vary in texture from gravel to clay.īrunisolic soils include some that are calcareous to the surface and very slightly weathered, and others that are strongly acid and apparently weathered to about the same extent as the associated Podzolic soils. The central concept of the order is that of soils formed under forest and having brownish-colored Bm horizons, but the order also includes soils of various colors with both Ae horizons and B horizons having slight accumulations of either clay (Btj), or amorphous Al and Fe compounds (Bfj), or both. Soils of the Brunisolic order have sufficient development to exclude them from the Regosolic order, but they lack the degree or kind of horizon development specified for soils of other orders. Figure 28: Diagrammatic horizon pattern of some subgroups of the Brunisolic order. In the description of each subgroup, presented later in this chapter, a common horizon sequence is given diagnostic horizons are underlined and some other commonly occurring horizons are listed. Individual subgroups may include soils that have horizon sequences different from those shown. Canadian System of Soil Classification, 3rd editionĪ diagrammatic representation of profiles of some subgroups of the Brunisolic order is given in Figure 28. ![]()
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