Transect - As used herein, a line on the ground along which observations are 

 made at some interval. 



Transition zone - The area in which a change from wetlands to nonwetlands 

 occurs. The transition zone may be narrow or broad. 



Transpiration - The process in plants by which water vapor is released into 

 the gaseous environment, primarily through stomata. 



Tree - A woody plant >3.0 in. in diameter at breast height, regardless of 

 height (exclusive of woody vines) . 



Typical - That which normally, usually, or commonly occurs. 



Typically adapted - A term that refers to a species being normally or commonly 

 suited to a given set of environmental conditions, due to some feature of its 

 morphology, physiology, or reproduction. 



Unconsolidated parent material - Material from which a soil develops, usually 

 formed by weathering of rock or placement in an area by natural forces (e.g. 

 water, wind, or gravity). 



Under normal circumstances - As used in the definition of wetlands, this term 

 refers to situations in which the vegetation has not been substantially 

 altered by man's activities. 



Uniform vegetation - As used herein, a situation in which the same group of 

 dominant species generally occurs throughout a given area. 



Upland - As used herein, any area that does not qualify as a wetland because 

 the associated hydrologic regime is not sufficiently wet to elicit development 

 of vegetation, soils, and/or hydrologic characteristics associated with 

 wetlands. Such areas occurring within floodplains are more appropriately 

 t ermed nonwe t lands . 



Value (soil color) - The relative lightness or intensity of color, approxi- 

 mately a function of the square root of the total amount of light reflected 

 from a surface; one of the three variables of color. 



Vegetation - The sum total of macrophytes that occupy a given area. 



Vegetation layer - A subunit of a plant community in which all component spe- 

 cies exhibit the same growth form (e.g., trees, saplings/shrubs, herbs). 



Very long duration (flooding) - A duration class in which the length of a 

 single inundation event is greater than 1 month. 



Verv poorly drained - Soils that are wet to the surface most of the time. 

 These soils are wet enough to prevent the growth of important crops (except 

 rice) unless artificially drained. 



Watermark - A line on a tree or other upright structure that represents the 

 maximum static water level reached during an inundation event. 



A13 



