Classification and Ordination of Alpine Plant Communities, Sheep Mountain, Lemhi Country, Idaho

The alpine vegetation in the immediate vicinity of Sheep Mountain, Lemhi Range, Lemhi County, Idaho, was investigated using data from field observations analyzed by the programs TWINSPAN and CANOCO (CCA). Percent cover of vegetation and environmental data were recorded for 77 plots. By computer anal...

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Bibliographic Details
Main Author: Urbanczyk, Stephen M.
Other Authors: AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
Format: Text
Language:English
Published: 1993
Subjects:
Biology
Ecology
*VEGETATION
*ECOLOGY
COMPUTER PROGRAMS
COMMUNITIES
THESES
SUBSTRATES
HABITATS
GRASSES
IDAHO
FORESTS
GRADIENTS
CORRELATION
MOUNTAINS
SLOPE
ELEVATION
SHEEP MOUNTAIN(IDAHO)
TWINSPAN COMPUTER PROGRAM
CANOCO COMPUTER PROGRAM
LEMHI COUNTY(IDAHO)
Calamagrostis purpurascens
Online Access:http://www.dtic.mil/docs/citations/ADA267981
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA267981
Description
Summary:The alpine vegetation in the immediate vicinity of Sheep Mountain, Lemhi Range, Lemhi County, Idaho, was investigated using data from field observations analyzed by the programs TWINSPAN and CANOCO (CCA). Percent cover of vegetation and environmental data were recorded for 77 plots. By computer analysis, eight communities were identified and then described with respect to apparent habitat preferences. The predominant communities are characterized by (1) Carex rupestris, (2) Carex elynoides, and (3) Calamagrostis purpurascens- Carex elynoides. An exposure gradient showed the strongest correlation with the community distribution, but substrate, elevation, and slope were also found to be important. In general, the study area communities present a uniformly dry turf-like physiognomy, with some early snowbed and Dryas or Salix mat communities occasionally present.

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