- 行业: Earth science
- Number of terms: 26251
- Number of blossaries: 0
- Company Profile:
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 layer of a substance completely or partly covering a surface of soil material. Coatings include clay coatings, calcite coatings, gypsum coatings, organic coatings, salt coatings, etc.
Industry:Earth science
A condition occurring when the quantity of nutrient available reduces growth. It can be from either a deficient or toxic concentration.
Industry:Earth science
A stream that appears to be too small to have eroded the valley in which it flows; a stream whose volume is greatly reduced or whose meanders show a pronounced shrinkage in radius. It is a common result of drainage changes effected by capture, glaciers, or climatic variations.
Industry:Earth science
A pipe perforated fro a prescribed interval (depth increment) in ort to equilibrate with the adjoining aquifer for measurement of the depth to the free-water surface, i.e., water table.
Industry:Earth science
A relatively soft rock formed by chemical alteration of glassy, high silica content volcanic ash. This material shows extensive swelling in water and has a high specific surface area. The principal mineral constituent is clay size smectite.
Industry:Earth science
A general term for a group of bacteria that inhabit the intestinal tract of humans and other animals. Their presence in water constitutes presumptive evidence for fecal contamination. Includes all aerobic and facultatively anaerobic, gram-negative rods that are nonspore forming and that ferment lactose with gas formation. Escherichia coli and Enterobacter are important members.
Industry:Earth science
A landform composed of the relatively undissected upland or ridge between two adjacent valleys or drainageways.
Industry:Earth science
Combinations of specific soil characteristics that are indicative of certain classes of soils. Those which occur at the soil surface are called epipedons, those below the surface, diagnostic subsurface horizons.
Industry:Earth science
A kind of land area having little or no soil and thus supporting little or no vegetation without major reclamation. Includes areas such as beaches, dumps, rock outcrop, and badlands. The term is used in defining soil survey map units.
Industry:Earth science
A secondary pore class between macropores and micropores that contributes to water flow and solute movement by advection and diffusion.
Industry:Earth science
