- 行业: 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 forest humus type, transitional between mull and mor, characterized by an accumulation or organic matter on the soil surface in friable Oe horizons, reflecting the dominant zoogenous decomposers. They are similar to mors in that they generally feature an accumulation of partially to well-humified organic materials resting on the mineral soil. They are similar to mulls in that they are zoologically active. Duff mulls usually have four horizons: Oi (L), Oe (F), Oa (H), and A. Oe Horizons have a USDA texture of mucky peat (hemic soil material are Oi horizons. Sometimes differentiated into the following Groups: Mormoder, Leptomoder, Mullmoder, Lignomoder, Hydromoder, and Saprimoder.
Industry:Earth science
(i) Any terrestrial formation resembling a bay of the sea, as a recess or extension of lowland along a river valley or within a curve in a range of hills, or an arm of a prairie extending into, or partly surrounded by, a forest. (ii) A Carolina Bay.
Industry:Earth science
1. The percent shrinkage in one dimension of a molded soil between two water contents, e.g. between its plastic limit to air dry. 2. Meaure of shrink-swell potential of soil.
Industry:Earth science
A long, narrow, sinuous, steep-sided ridge composed of irregularly stratified sand and gravel that was deposited by a subglacial or supraglacial stream flowing between ice walls, or in an ice tunnel of a retreating glacier, and was left behind when the ice melted. Eskers range in length from less than a kilometer to more than 160 km, and in height from 3 to 30 m.
Industry:Earth science
Water adsorbed by a dry soil from an atmosphere of high relative humidity, water remaining in the soil after "air-drying," or water held by the soil when it is in equilibrium with an atmosphere of a specified relative humidity at a specified temperature, usually 98% relative humidity at 25°C.
Industry:Earth science
A short, steep slope formed gradually at the downslope margin of a field by deposition against a hedge, a stone wail, or other similar barrier.
Industry:Earth science
A general term applied to detrital volcanic materials that have been explosively or aerially ejected from a volcanic vent.
Industry:Earth science
A great soil group of the intrazonal order and calcimorphic suborder consisting of soils with brown or black friable surface horizons underlain by light gray to pale yellow calcareous material developed from soft, highly calcareous parent material under grass vegetation or mixed grasses and forest in humid and semiarid climates.
Industry:Earth science
The minimum moisture condition, measured either in terms of moisture content or moisture stress, at which biological activity just becomes measurable.
Industry:Earth science
A count of the number of colonies formed on a solid culture medium when inoculated with a small amount of soil. The technique has been used to estimate the number of certain organisms present in the soil sample.
Industry:Earth science
