Ecosystem 



Habitat 

 Type 



Vegetation 

 Type 



Community 

 Type 



Habitat 

 Phase 



All the land that has potential to produce similar stnictural 

 life forms and has similar broad environmental characteris- 

 tics (nonvegetated, conifer, juniper, shrub dominated wet- 

 land, grassland/grass-steppe/mountain grass). 



All the land capable of producing similar plant communities 

 at climax. A habitat type name incorporates those plant 

 species which best define the envirormient (typically two 

 species). Habitat types sometimes are estimated since 

 existing vegetation types may be serai because of distur- 

 bance. 



All the plant communities that are similar with respect to 

 both species type and abundance within all layers. Charac- 

 terized by minimal variability in plant species composition. 



All the plant communities in which the dominant and/or 

 indicator species of corresponding layers arc similar. 



A refinement of a habitat type in which additional indicator 

 plant species are used to define a more narrow range of 

 environmental conditions. 



Physical Terms 



Site Type 



Parent Material 



Hydrologic 



Unit 



Code 



AH sites possessing similar soil, parent material, slope 

 position, shape, aspect, elevation, and climate. 



Specific rock type. 



USGS code for basin, sub-basin. 



Stream 

 Order 



Standard Horton stream order. 



Valley 



Bottom 



Type 



Valley 



Bottom 



Subtype 



Stream 

 Classification 



Valley gradient. 



Valley form and sideslope. 



Class as defined by Rosgen (1985) Al, B2, etc., including 

 debris, stream size, flow regimen, deposiiional feature, 

 meander pattern, sinuosity, form, bankfull gradient. 



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