carbonate horizon

碳酸盐层

English-Chinese Dictionary of Agriculture (英汉农业大词典). 2013.

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  • 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

  • Soil Horizon letter designations — ▪ Table Soil horizon letter designations See as table: Base symbols for surface horizons O organic horizon containing litter and decomposed organic matter A mineral horizon darkened by humus accumulation       Base symbols for subsurface horizons …   Universalium

  • inception horizon —    A part of a rock succession that is particularly susceptible to the effects of the earliest cave forming processes and hence is critical to the origin of most non tectonic caves. By virtue of physical, lithological or chemical deviation from… …   Lexicon of Cave and Karst Terminology

  • 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

  • Ocean acidification — Change in sea water acidity pH caused by anthropogenic CO2 between the 1700s and the 1990s Ocean acidification is the name given to the ongoing decrease in the pH and increase in acidity of the Earth …   Wikipedia

  • Fuel cell — For other uses, see Fuel cell (disambiguation). Demonstration model of a direct methanol fuel cell. The actual fuel cell stack is the layered cube shape in the center of the image A fuel cell is a device that converts the chemical energy from a… …   Wikipedia

  • Silurian Period — Interval of geologic time, 443–417 million years ago. The third period of the Paleozoic Era, the Silurian follows the Ordovician Period and precedes the Devonian. It marks the first appearance of land plants and jawed fishes. The continents were… …   Universalium

  • 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 horizons sont d… …   Wikipédia en Français

  • Profil du sol — 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 — 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

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