- 産業: Earth science
- Number of terms: 26251
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An international scientific society that fosters the transfer of knowledge and practices to sustain global soils. Based in Madison, WI, and founded in 1936, SSSA is the professional home for 6,000+ members dedicated to advancing the field of soil science. It provides information about soils in ...
A process in which pedogenesis in a surface layer of parent rock or sediment feeds physicochemical and other imprints downward into a subjacent buried soil formed in a separate parent rock or sediment, leading to pedogenic 'fusion' of the two soils. Also referred to as pedogenic overprinting or pedogenic imprinting. (added 6/1/2000)
Industry:Earth science
A soil aggregate which is stable to the action of water such as falling drops, or agitation as in wet-sieving analysis.
Industry:Earth science
(i) Texture group consisting of sand and loamy sand textures. (ii) Family particle-size class for soils with sand or loamy sand textures and <35% rock fragments in upper subsoil horizons.
Industry:Earth science
The degree of acidity or alkalinity of a soil, usually expressed as a pH value. Descriptive terms commonly associated with certain ranges in pH are: extremely acid, <4. 5; very strongly acid, 4. 5-5. 0; strongly acid, 5. 1-5. 5; moderately acid, 5. 6-6. 0; slightly acid, 6. 1-6. 5; neutral, 6. 6-7. 3; slightly alkaline, 7. 4-7. 8; moderately alkaline, 7. 9-8. 4; strongly alkaline, 8. 5-9. 0; and very strongly alkaline, >9. 1.
Industry:Earth science
A flat, undulating, or even rolling area, larger or smaller, that includes few prominent hills or valleys, that usually is at low elevation in reference to surrounding areas, and that may have considerable overall slope and local relief.
Industry:Earth science
A boundary between soil and continuous, coherent, underlying material. The underlying material must be sufficiently coherent to make hand-digging with a spade impractical. If a single mineral, its hardness is 3 (Mohs scale), and gravel size chunks that do not disperse with 15 hours shaking in water or sodium hexametaphosphate solution.
Industry:Earth science
A solute that is chemically and biologically inert (no transformation losses with time) but could exhibit an adsorption capacity that results in loss from solution.
Industry:Earth science
The percentage of water contained in a soil that has been saturated, subjected to, and is in equilibrium with, an applied pressure of 15 atm. Approximately the same as fifteen-bar percentage.
Industry:Earth science
A curve showing the accumulative percentage by mass of particles within increasing (or decreasing) size limits as a function of diameter; the percent by mass of each size fraction is plotted accumulatively on the ordinate as a function of the total range of diameters represented in the sample plotted on the abscissa.
Industry:Earth science
A layer-structured aluminosilicate mineral group of the 2:1 type that is characterized by its non expandability and high layer charge, which is usually satisfied by potassium. The major types are muscovite, biotite, and phlogopite.
Industry:Earth science
