1987 Wetland Delineation Manual - The Wetlands Regulation Center
1987 Wetland Delineation Manual - The Wetlands Regulation Center
1987 Wetland Delineation Manual - The Wetlands Regulation Center
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<strong>Wetland</strong> Delination <strong>Manual</strong>, <strong>1987</strong> 86<br />
Range - As used herein, the geographical area in which a plant species is known to occur.<br />
Redox potential - A measure of the tendency of a system to donate or accept electrons, which<br />
is governed by the nature and proportions of the oxidizing and reducing substances contained<br />
in the system.<br />
Reducing environment - An environment conducive to the removal of oxygen and chemical<br />
reduction of ions in the soils.<br />
Relative density - A quantitative descriptor, expressed as a percent, of the relative number of<br />
individuals of a species in an area; it is calculated by<br />
Number of individuals of species A X 100<br />
Total number of individuals of all species<br />
Relative dominance - A quantitative descriptor, expressed as a percent, of the relative size or<br />
cover of individuals of a species in an area; it is calculated by<br />
Amount* of species A X 100<br />
Total amount of all species<br />
*<strong>The</strong> amount of a species may be based on percent areal cover, basal area, or height.<br />
Relative frequency - A quantitative descriptor, expressed as a percent, of the relative<br />
distribution of individuals of a species in an area; it is calculated by<br />
Frequency of species A X 100<br />
Total frequency of all species<br />
Relief - <strong>The</strong> change in elevation of a land surface between two points; collectively, the<br />
configuration of the earth's surface, including such features as hills and valleys.<br />
Reproductive adaptation - A feature of the reproductive mechanism of a species that results in<br />
it being better fitted to its environment (e.g. ability for seed germination under water).<br />
Respiration - <strong>The</strong> sum total of metabolic processes associated with conversion of stored<br />
(chemical) energy into kinetic (physical) energy for use by an organism.<br />
Rhizosphere - <strong>The</strong> zone of soil in which interactions between living plant roots and<br />
microorganisms occur.<br />
Root zone - <strong>The</strong> portion of a soil profile in which plant roots occur.<br />
25 February 1997 Environmental Techncal Services Co. 834 Castle Ridge Rd Austin, Texas 78746