Pubescence - Having a covering of hairs. Respiration - Metabolic assimilation of oxygen accompanied by release of energy, carbon dioxide, and water, and by breaking down of organic compounds. Sand - Soil particles greater than .02 mm diameter. Sandy soils have an average particle size greater than that. Scrub Vegetation - Physiognomic classification of short-statured, smallleaved shrubs which are very woody in nature. Semiarid - Climatic zone in which precipitation varies from 150-250 mm to 250-500 mm annually, depending on annual evaporitivity of the area. Sensible Heat Flux - Flow of heat between surface and air. Shrub - Perennial woody plant without a central tree-like trunk. Stomatai Rhythms - Rhythms of opening and closing of stomates as a function of microenvironmental conditions. Stomates - Pores through which gas exchange occurs in the leaves of higher plants. Succession - Change in composition in populations of organisms at a given location through time. Surface Texture - Particle size distribution at the surface of a soil. Tenebrionid Beetles - Family of beetles in which both adults and larvae are scavengers. Thermal Capacity - Ability of a medium to store energy. Thermal Conductance - Rate at which heat flows through a substance. Thermal Conductivity - The amount of energy which can flow across a unit area if the temperature gradient is unity. Thermal Radiation - Longwave (> 4 p), or infrared, radiation. Thermoperiodism - Seasonal responses by organisms to warming or cooling cycles in the environment. Transpiration - Water loss by plants. Turbulence - Non laminar (non layerlike) wind flow. Vapor Pressure - The pressure produced by water molecules in the vapor state. Water Potential - The chemical potential of water (free energy per mole) in a system. Water Use Efficiency - The ratio of primary production over transpirational water loss. Weeds - Troublesome or aggressive plants that intrude where not wanted, especially plants which vigorously colonize disturbed areas. Xeric - Pertaining to, or growing in, a dry habitat.
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