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ECOLOGY - The science or study of the relationships between organisms and their environment.
EDGE - The transition between two different types or ages of vegetation.
ENDANGERED or THREATENED SPECIES - A species is endangered when the total number of remaining members may not be sufficient to reproduce enough offspring to ensure survival of the species. A threatened species exhibits declining or dangerously low populations but still has enough members to maintain or increase numbers.
ENVIRONMENT - The interaction of climate, soil, topography, and other plants and animals in any given area. An organism's environment influences its form, behavior, and survival.
EROSION - The wearing away of land or soil by the action of wind, water, or ice.
EVAPOTRANSPIRATION - The evaporation of water from the soil and the transpiration of water from the plants that live in that soil. Approximately one-quarter of a forest's annual rainfall returns to the air through evapotranspiration.
EVEN-AGED MANAGEMENT - A forest management method in which all trees in an area are harvested at one time or in several cuttings over a short time to produce stands that are all the same age or nearly so. This management method is commonly applied to shade-intolerant conifers and hardwoods.
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