- 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 ...
(i) A zone near the surface, more or less cemented by secondary carbonates of Ca or Mg precipitated from the soil solution. It may occur as a soft thin soil horizon, as a hard thick bed, or as a surface layer exposed by erosion. (ii) Alluvium cemented with NaNO3, NaCl, and/or other soluble salts in the nitrate deposits of Chile and Peru.
Industry:Earth science
A general term for the solid rock that underlies the soil and other unconsolidated material or that is exposed at the surface.
Industry:Earth science
A stream, or reach of a stream, that does not flow year-round and that flows only when a) it receives baseflow solely during wet periods, or b) it receives ground-water discharge or protracted contributions from melting snow or other erratic surface and shallow subsurface sources.
Industry:Earth science
(i) The mode of origin of the soil with special reference to the processes or soil-forming factors responsible for development of the solum, or true soil, from unconsolidated parent material. (ii) The branch of soil science that deals with soil genesis.
Industry:Earth science
A group of 2:1 layer silicates with a high cation exchange capacity, about 110 cmolc kg-1for soil smectites, and variable interlayer spacing. Formerly called the montmorillonite group. The group includes dioctahedral members montmorillonite, beidellite, and nontronite, and trioctahedral members saponite, hectorite, and sauconite.
Industry:Earth science
A measure of the chromatic composition of light that reaches the eye; one of the three variables of color.
Industry:Earth science
(i) The entire complex of surface and near surface attributes of the solid portions of the surface of the earth, which are significant to human activities; water bodies occurring within land masses are included in some land classification systems. (ii) (economics) One of the major factors of production that is supplied by nature and includes all natural resources in their original state, such as mineral deposits, wildlife, timber, fish, water, coal, and the fertility of the soil.
Industry:Earth science
A long, broad low ridge or embankment of sand and coarse silt, built up by a stream on its flood plain and along both sides of its channel. They are wedge-shaped deposits, of the coarsest suspended-load material, that slope gently away from the stream.
Industry:Earth science
A method of preparing forest soils for planting or seeding by passing a heavy drum roller with sharp parallel blades over the site to break up organic debris and mix it into the mineral soil.
Industry:Earth science
A general term for middle-infrared wavelengths which are transmitted through the atmosphere window at 8 to 13 µm. Occasionally also used for the windows around 3 to 6 µm.
Industry:Earth science
