- 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) Permanently frozen material underlying the solum. (ii) A perennially frozen soil horizon.
Industry:Earth science
A method for culturing organisms in which the organism and supporting nutritive medium are added to a closed system. Contrast with chemostat.
Industry:Earth science
A plagioclase feldspar containing calcium (90-100%) and sodium (0-10%).
Industry:Earth science
A population of microorganisms cultivated in an artificial growth media. A pure culture is grown from a single cell; a mixed culture consists of two or more microorganisms growing together.
Industry:Earth science
A plant or plants used to measure the physical factors of the habitat in terms of physiological activities.
Industry:Earth science
A measure of the resistance of soil to conduct electricity used to infer the soil water matric potential from predetermined calibrations.
Industry:Earth science
A nonsodic soil containing sufficient soluble salt to adversely affect the growth of most crop plants. The lower limit of saturation extract electrical conductivity of such soils is conventionally set at 4 dS m-1(at 25 °C). Actually, sensitive plants are affected at half this salinity and highly tolerant ones at about twice this salinity.
Industry:Earth science
A kind of map unit used in soil surveys comprised of two or more taxa components that are not consistently associated geographically. Delineations show the size, shape, and location of a landscape unit composed of one or the others, or all of two or more component soils that have the same or very similar use and management for specified common uses. Inclusions may occur up to some allowable limit.
Industry:Earth science
A soil moisture regime that is intermediate between the aridic and udic regimes and common in temperate subhumid or semiarid regions, or in tropical and subtropical regions with a monsoon climate. A limited amount of water is available for plants but occurs at times when the soil temperature is optimum for plant growth.
Industry:Earth science
A profile of plants and soil showing the vertical and lateral distribution of roots and tops in their natural position.
Industry:Earth science
