Inversion Layer - An environmental anomaly in which air temperature increases with elevation from the ground surface. Lagomorphs - Rabbits and hares. Latent Heat - Heat tied up in liquid water, which is released to the environment as evaporation occurs. Thus, organisms dissipate latent heat as they lose water vapor to the environment. Lepidoptera - An order of insects, composed of the butterflies and moths, which feed mainly on nectar and plant-derived liquid food. Loam - Soil texture classification intermediate between clay and sand. Macropore Space - Percentage of soil volume taken up by large soil interstices. Mesic - Pertaining to, or growing in, a moist habitat. Microclimate - The climate in which plants and animals live. Microenvironment - The specific environment in which an organism lives. Microhabitat - The amount of a total habitat which is utilized by a given organism. Microtopography - Topography of an organisms microenvironment. Morphology - The specific form, shape or structure of an organism. Net Radiation - The difference between total upward and downward radiation fluxes. Is a measure of the energy available at the ground surface. Nocturnal - Pertaining to the nighttime. Penetration Resistance - Related to bulk density of the surface layer of a soil. Measured by recording the number of impacts required by a penetrometer to reach a soil depth of 6 cm. Perennial Plants - Plants which live longer than one year. Perturbation - A disturbance of normal processes in an ecosystem. Phenology - Periodic phenomena in organisms as related to variation in climatic factors. Photoperiod - Length in time that the sun remains above the horizon. Photoperiodism - Seasonal responses by organisms to change in the length of the daylight period. Photosynthesis - The conversion of radiant energy into bound chemical energy by green plants. Photothermal Systems - Central collector systems in which arrays of reflecting surfaces direct incident solar radiation to a central receiving tower, which collects and stores the energy. Photovoltaic Systems - Distributive solar collecting facilities in which silicon cells mounted on individual collectors individually directly convert solar energy into electrical energy. Primary Productivity - Rate of dry-matter production by photosynthesis in an ecosystem.
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