- المجال: 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 organic material having undergone little or no decomposition (fibric material). On the forest floor this layer consists of freshly fallen leaves, needles, twigs, stems, bark, and fruits. This layer may be very thin or absent during the growing season.
Industry:Earth science
The process or processes of soil formation in which the surface soil is kept sufficiently supplied with calcium to saturate the soil cation exchange sites, or the process of accumulation of calcium in some horizon of the profile, such as the calcic horizon of some Aridisols and Mollisols.
Industry:Earth science
A low concentration of an essential element that reduces plant growth and prevents completion of the normal plant life cycle.
Industry:Earth science
A color designation system that specifies the relative degrees of the three simple variables of color: hue, value, and chroma. For example: 10YR 6/4 is a color (of soil) with a hue = 10YR, value = 6, and chroma = 4.
Industry:Earth science
A sequence of soils of about the same age, derived from similar parent material, and occurring under similar climatic conditions, but having different characteristics due to variation in relief and in drainage.
Industry:Earth science
(i) The particular role that a given species plays in the ecosystem; (ii) The physical space occupied by an organism.
Industry:Earth science
A soil temperature regime that has mean annual soil temperatures of 22°C or more and >5°C difference between mean summer and mean winter soil temperatures at 50 cm below the surface. Isohyperthermic is the same except the summer and winter temperatures differ by <5°C.
Industry:Earth science
A hardened layer cemented by calcium carbonate. Better term may be caliche.
Industry:Earth science
