- diagnostic soil horizon
- 诊断土层
English-Chinese Dictionary of Agriculture (英汉农业大词典). 2013.
diagnostic soil horizon
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Soil horizon — Soil samples illustrating horizons (subsoil on right) A soil horizon is a specific layer in the land area that is parallel to the soil surface and possesses physical characteristics which differ from the layers above and beneath … Wikipedia
soil — soil1 soilless, adj. /soyl/, n. 1. the portion of the earth s surface consisting of disintegrated rock and humus. 2. a particular kind of earth: sandy soil. 3. the ground as producing vegetation or as cultivated for its crops: fertile soil. 4. a… … Universalium
horizon — /heuh ruy zeuhn/, n. 1. the line or circle that forms the apparent boundary between earth and sky. 2. Astron. a. the small circle of the celestial sphere whose plane is tangent to the earth at the position of a given observer, or the plane of… … Universalium
Petrocalcic Horizon — A petrocalcic horizon is a diagnostic horizon in USDA soil taxonomy. They are formed when secondary Calcium Carbonate or other carbonates accumulate in the subsoil to the extent that the soil becomes cemented into a hardpan. Petrocalcic horizons… … Wikipedia
Duplex soil — With the term “duplex soil”, Northcote defined a primary profile in his Factual Key classification.[1] He described a group of texture contrast soils where the B horizon is dominated by a texture class one and a half (or more) finer than the A… … Wikipedia
Duripan — A duripan is a diagnostic soil horizon of the USDA soil taxonomy that is cemented by illuvial silica into a subsurface hardpan. Similar to a fragipan, petrocalcic horizon and petrogypsic horizon, it is firmly cemented and restricts soil… … Wikipedia
Spodic soils — refer to a diagnostic subsurface horizon defined by the illuvial accumulation of organic matter. Iron oxide can be present or absent, and the soil is generally derived from a sandy parent material. Spodic may also refer to the taxonomic soil… … Wikipedia
Fragipan — A fragipan is a diagnostic horizon in USDA soil taxonomy. They are altered subsurface soil layers that restrict water flow and root penetration. Fragipans are similar to a duripan in how they affect land use limitations. In soil descriptions,… … Wikipedia
HYDROMORPHES (SOLS) — En pédologie, l’hydromorphie désigne un ensemble de processus résultant de l’action de l’eau envisagée comme facteur principal d’évolution des sols. Sont considérés comme hydromorphes les sols dont la genèse est dominée par un excès d’eau… … Encyclopédie Universelle
Mollisols — Mollisol a Mollisol profile Used in: USDA soil taxonomy Parent material: loess M … Wikipedia
Africa — /af ri keuh/, n. 1. a continent S of Europe and between the Atlantic and Indian oceans. 551,000,000; ab. 11,700,000 sq. mi. (30,303,000 sq. km). adj. 2. African. * * * I Second largest continent on Earth. It is bounded by the Mediterranean Sea,… … Universalium
