. Aspen community types of Utah. Forest ecology Utah; Aspen; Plant communities Utah. southeastern Idaho that is virtually identical composi- tionally to our POTR/CAGE A P. tremuloides/ C. rubescens type was also identified for western Wyoming (Youngblood and Mueggler 1981) that resem- bles the Utah type but has more structural variation. Calamagrostis rubescens usually replaces C. geyeri as the characterizing graminoid in these more northern locations. In northwestern Colorado, a structurally and compositionally similar type was identified by Hoffman and Alexander (1983) as the P. tremulo


. Aspen community types of Utah. Forest ecology Utah; Aspen; Plant communities Utah. southeastern Idaho that is virtually identical composi- tionally to our POTR/CAGE A P. tremuloides/ C. rubescens type was also identified for western Wyoming (Youngblood and Mueggler 1981) that resem- bles the Utah type but has more structural variation. Calamagrostis rubescens usually replaces C. geyeri as the characterizing graminoid in these more northern locations. In northwestern Colorado, a structurally and compositionally similar type was identified by Hoffman and Alexander (1983) as the P. tremuloides/C. geyeri habitat type. Although the P. tremuloides/C. geyeri habi- tat type described by Wirsing and Alexander (1975) for southeastern Wyoming contains the same characterizing graminoids in the herbaceous stratum, it differs struc- turally from our POTR/CAGE because of the abun- dance of the shrub J. communis; their type corresponds more closely to our POTR/JUCO/CAGE Populus tremuloides/Festuca thurheri Community Type (POTR/FETH ) This infrequent community type was encountered only in the southern portion of Utah on the Fishlake, Sevier, and Aquarius Plateaus. The 14 sampled stands were at elevations ranging from 8,000 to 9,500 ft (2 440 to 2 900 m), on moderately steep concave or undulating slopes and over a wide variety of exposures. The stands were encountered only on soils derived from volcanic or granitic parent materials. The vegetation is characterized by an abundance of the tussock Festuca thurberi in the undergrowth (fig. 10). The type is differentiated from the POTR/SYOR/FETH by the lack of a distinct Symphoricarpos oreophilus- dominated shrub layer. However, S. oreophilus is fre- quently present but only in minor amounts. The over- story consists of Populus tremuloides with an occasional conifer, primarily Abies lasiocarpa and Picea engelmannii. Usually Stipa occidentalis is present; occasionally Bromus carinatus is abundant. The most common


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