Solum
.
Solum and soils are not synonymous. Some soils include layers that are not affected by soil formation. These layers are not part of the solum. The number of genetic horizons ranges from one to many. A surface layer that is 10 cm thick overlying
bedrock can be by itself the solum. A soil that consists only of recently depositedalluvium or recently exposed softsediment does not have a solum.In terms of
soil horizon designations, a solum consists of A, E, andB horizon s and their transitional horizons and some O horizons. Included are horizons with an accumulation ofcarbonate s or more solublesalt s if they are either within, or contiguous, to other genetic horizons and are at least partly produced in the same period of soil formation. The solum of a soil presently at the surface, for example, includes all horizons now forming. The solum of a soil is not necessarily confined to the zone of major biological activity. A solum does not have a maximum or a minimum thickness.The lower limit should relate to the depth of rooting to be expected for
perennial plants assuming thatsoil moisture conditions andsoil chemistry are not limiting. In some soils the lower limit of the solum can be set only arbitrarily and needs to be defined in relation to the particular soil. For example, horizons of carbonate accumulation are easily visualized as part of the solum in many soils in arid and semiarid environments. To conceive of hardened carbonate accumulations extending for 5 meters or more below the B horizon as part of the solum is more difficult. Gleyed soil material begins in some soils a few centimeters below the surface and continues practically unchanged to a depth of many meters. Gleying immediately below the A horizon is likely to be related to the processes of soil formation in the modern soil. At great depth, gleying is likely to be relict or related to processes that are moregeologic al than pedological. Much the same kind of problem exists in some deeply weathered soils in which the deepest material penetrated by roots is very similar to the weathered material at much greater depth. [cite web | url = http://soils.usda.gov/technical/manual/print_version/complete.html | title = Soil Survey Manual | author = Soil Survey Staff | date = 1993 | publisher = Soil Conservation Service. U.S. Department of Agriculture Handbook 18. | accessdate = 2006-07-02]References
Wikimedia Foundation. 2010.
Look at other dictionaries:
şolum — şolúm, şolúmi, s.m. (reg.) persoană şchioapă; şchiop. Trimis de blaurb, 14.02.2007. Sursa: DAR … Dicționar Român
solum — Latin, “ground, soil,” of unknown origin … Etymology dictionary
solum — [sō′ləm] n. pl. solums or sola [sō′lə] [ModL < L, base, soil] the altered soil or material overlying the parent material, often including the A horizon and the B horizon … English World dictionary
Solum — Profil de sol Les différents horizons d un profil de sol Le profil de sol est l ensemble des horizons d un sol donné ; chaque horizon étant une couche repérable et distincte de ce sol. On parle aussi de solum ou des horizons du sol. Ces… … Wikipédia en Français
Solum — Das Solum (lat. Boden) ist ein Begriff aus der Bodenkunde und bezeichnet einen Bodenkörper ohne die Streuschicht (L) und das Ausgangsgestein (C) mit einzubeziehen. Werden diese mit einbezogen, spricht man vom Pedon. Literatur Blum, Winfried E.H.; … Deutsch Wikipedia
solum — so̱lum [lat.]: Adverb mit der Bedeutung „nur, ausschließlich“; z. B. in der Fügung ↑Albinismus solum bulbi … Das Wörterbuch medizinischer Fachausdrücke
solum — /ˈsoʊləm/ (say sohluhm) noun (plural solums or sola / la/) the upper layers of a soil profile in which topsoil formation occurs in response to climate and vegetation. {New Latin, from Latin solum ground} … Australian English dictionary
solum — noun (plural sola or solums) Etymology: New Latin, from Latin, ground, soil Date: 1928 the altered layer of soil above the parent material that includes the A and B horizons … New Collegiate Dictionary
solum — /soh leuhm/, n., pl. sola / leuh/, solums. the upper part of the soil profile, which is influenced by plant roots; the A horizon and the B horizon. [1820 30; < L: base, bottom; see SOLE2] * * * … Universalium
solum — noun Within a soil profile, a set of related soil horizons that share the same cycle of pedogenic processes … Wiktionary
