- 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 ...
Arrangement resulting from silica tetrahedra sharing two oxygen per tetrahedron and linked linearly: silicon-oxygen ration is SiO32-.
Industry:Earth science
Alfisols that have a xeric soil moisture regime. Xeralfs are brownish or reddish throughout.
Industry:Earth science
In the context of soil survey, a class at any categorical level in the U. S. system of soil taxonomy.
Industry:Earth science
Mixing within a soil or sediment profile by various processes, such as animal burrowing, tree throw, freeze-thaw cycles, etc. It usually involves disturbance of the skeletal fabric as opposed to redistribution of only the fine particles. (added 6/1/2000)
Industry:Earth science
Net carbon assimilation by plants. NPP = GPP - respiration losses. NPP can be estimated for a given time period as ΔB + L + H, where ΔB = biomass accumulation for the period, L = biomass of material produced in the period and shed (i.e. foliage, flowers, branches), and H = biomass produced in the period and consumed by animals and insects.
Industry:Earth science
An undefined theoretical ratio of two or more plant nutrient concentrations for an optimum growth rate and yield. Nitrogen and sulfur is an classic example that can be defined because both nutrients are metabolically related in the protein fraction.
Industry:Earth science
Rock or mineral fragments between 250 and 600 mm in diameter if rounded, and 380 to 600 mm if flat.
Industry:Earth science
