. Aspen community types of Utah. Forest ecology Utah; Aspen; Plant communities Utah. and averaged 1,219 lb/acre (1 369 kg/ha). The bulk of this was divided rather evenly between grasses (50 percent) and forbs (46 percent); only 4 percent was shrubs. Of the undergrowth, 35 percent was classified as desirable and 60 percent was of intermediate forage suitability. The type, therefore, is moderately productive livestock range, particularly for cattle. Because this type apparently has been altered considerably by heavy grazing, its potential for producing forage is probably greater than its current
. Aspen community types of Utah. Forest ecology Utah; Aspen; Plant communities Utah. and averaged 1,219 lb/acre (1 369 kg/ha). The bulk of this was divided rather evenly between grasses (50 percent) and forbs (46 percent); only 4 percent was shrubs. Of the undergrowth, 35 percent was classified as desirable and 60 percent was of intermediate forage suitability. The type, therefore, is moderately productive livestock range, particularly for cattle. Because this type apparently has been altered considerably by heavy grazing, its potential for producing forage is probably greater than its current production. Judging from perceived successional relation- ships, the proportion of palatable forbs and possibly shrubs was at one time much greater than at present. Wildlife habitat values are comparatively low because of the simplicity of vegetation structure and lack of under- growth diversity. This serai type has not been reported elsewhere. But because it is believed to represent a grazing-degraded stage of the POTR/SESE and possibly the POTR/SYOR/SESE type, which are both present in sur- rounding States, this serai type likely occurs there as well. Figure 11.—The Populus tremuloides/Bromus carinatus is probably a grazing-induced serai type created by heavy, prolonged sheep grazing of a climax POTR/SESE The undergrowth in this stand in the upper part of the Seventeen Mile Creek drain- age of the Fishlake National Forest is dominated by B. carinatus and Agropyron trachycaulum. Populus tremuIoides/Poa pratensis Community Type (POTR/POPR ) The POTR/POPR is a serai type that, although not common, spans the State from the Bear River and Uinta Mountains in the north, to the Markagunt Plateau and LaSal Mountains in the south. We sampled 18 stands to describe this type, ranging in elevation from 7,000 to 9,450 ft (2 130 to 2 880 m) and usually occur- ring on flats or shallow slopes (less than 25 percent) of northerly or easterly exposures. Soil parent mat
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