Chapter 1. Introduction
9
responses. Vegetation classes are differentiated in part based on the wetland
indicator status of plant species (Reed 1988) but sensitized to riparian
ecosystems. Other factors influencing vegetation patterns are reach-scale stream
power or stream gradient, valley width, geomorphic setting, geologic substrate,
human influence, and fire history (Szaro 1990, Bendix 1994, Minckley and
Brown 1994, Evans 2001). Recognizing vegetation responses to patterns in
hydrology and other factors influencing species assemblages will be useful in
establishing the OHW boundary.
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