Intrazonal soils have more or less well-defined soil profile characteristics that reflect the dominant influence of some resident factor of relief or parent material over the classic zonal effects of climate and vegetation. There are three major sub-types, two of which have two further sub-types each.
Calcimorphic or calcareous soils develop from a limestone. It has two sub-types:
Terra rossa soils are deep red soils associated with higher rainfall than rendzina.
Hydromorphic soils form in wetland conditions. There are two sub-types:
Gley soils - These occur when the pore spaces between the grains become saturated with water and contain no air. This lack of oxygen leads to anaerobic conditions which reduce the iron in the parent rock. This gives the soil a characteristic grey/blue colour with flecks of red.
Peat soils form under circumstances that prevent the breakdown of vegetation completely.
These soils are formed in mountainous regions out of fine grains produced by weathering. However, due to various reasons, this fine grained material constantly slides down the slope. As a result, the time necessary for the formation of soils does not become available. Therefore, these soils remain immature. An example is soil along the slopes of the Himalayan mountains. In river plains, particularly in flood-plain areas, new alluvium is deposited every year. The time for soil formation remains inadequate. Hence, flood plain soils also remain immature. In river plains, due to alluvium and availability of water, the farmlands are fertile but the soils remain immature.
Baldwin, M.; C.E. Kellogg; J. Thorp (1938). "Soil Classification". Soils and Men: Yearbook of Agriculture 1938. U.S. Government Printing Office, Washington, D.C. pp. 979–1001.
Brevik, Eric C. (November 2002). "Soil Classification in Geology Textbooks" (PDF). Journal of Geoscience Education. 50 (5): 539–543. doi:10.5408/1089-9995-50.5.539. S2CID 116487861. Retrieved 2006-04-06.
January 01, 1970
1938, usda, soil, taxonomy, 1938, soil, taxonomy, divided, soils, into, three, orders, dependent, dominant, soil, forming, factors, contents, intrazonal, soils, azonal, soil, also, referencesintrazonal, soils, editintrazonal, soils, have, more, less, well, def. The 1938 soil taxonomy divided soils into three orders dependent on dominant soil forming factors Contents 1 Intrazonal soils 2 Azonal soil 3 See also 4 ReferencesIntrazonal soils editIntrazonal soils have more or less well defined soil profile characteristics that reflect the dominant influence of some resident factor of relief or parent material over the classic zonal effects of climate and vegetation There are three major sub types two of which have two further sub types each Calcimorphic or calcareous soils develop from a limestone It has two sub types Rendzina soils are thin soils with limited available water capacity Terra rossa soils are deep red soils associated with higher rainfall than rendzina dd Hydromorphic soils form in wetland conditions There are two sub types Gley soils These occur when the pore spaces between the grains become saturated with water and contain no air This lack of oxygen leads to anaerobic conditions which reduce the iron in the parent rock This gives the soil a characteristic grey blue colour with flecks of red Peat soils form under circumstances that prevent the breakdown of vegetation completely dd Halomorphic soils form due to soil salination Azonal soil editSee also Azonal These soils are formed in mountainous regions out of fine grains produced by weathering However due to various reasons this fine grained material constantly slides down the slope As a result the time necessary for the formation of soils does not become available Therefore these soils remain immature An example is soil along the slopes of the Himalayan mountains In river plains particularly in flood plain areas new alluvium is deposited every year The time for soil formation remains inadequate Hence flood plain soils also remain immature In river plains due to alluvium and availability of water the farmlands are fertile but the soils remain immature See also editRed Mediterranean soilReferences editBaldwin M C E Kellogg J Thorp 1938 Soil Classification Soils and Men Yearbook of Agriculture 1938 U S Government Printing Office Washington D C pp 979 1001 Brevik Eric C November 2002 Soil Classification in Geology Textbooks PDF Journal of Geoscience Education 50 5 539 543 doi 10 5408 1089 9995 50 5 539 S2CID 116487861 Retrieved 2006 04 06 Retrieved from https en wikipedia org w index php title 1938 USDA soil taxonomy amp oldid 1163706363, wikipedia, wiki, book, books, library,
