. The Canadian field-naturalist. 86 The Canadian Field-Naturalist Vol. 95. Figure I. Map showing the location of the 14 study sites and the browse sampling sites in Mount McKinley National Park, Alaska. were dispersed in small dense patches of less than 5 ha (1 ha = 10 000 m-), such as on river islands, in clear- ings, or along streams. Browsing intensities were sig- nificantly lower {P<\, /-test) in mixed-species stands greater than 5 ha in size ( ± ) or when forage shrubs were widely dispersed. The rela- tive proportions of the stand types in Mount McKin- ley National Park are
. The Canadian field-naturalist. 86 The Canadian Field-Naturalist Vol. 95. Figure I. Map showing the location of the 14 study sites and the browse sampling sites in Mount McKinley National Park, Alaska. were dispersed in small dense patches of less than 5 ha (1 ha = 10 000 m-), such as on river islands, in clear- ings, or along streams. Browsing intensities were sig- nificantly lower {P<\, /-test) in mixed-species stands greater than 5 ha in size ( ± ) or when forage shrubs were widely dispersed. The rela- tive proportions of the stand types in Mount McKin- ley National Park are not known. There was no corre- lation between browsing intensities and number of twigs per stem. Biomass of browse available, carrying capacities, and browse utilization at the three Savage River stands are shown in Table 2. The mean (±SE) diame- ters at point of browsing were ± mm for S. alaxensis, ± mm for Littletree Willow {S. arbusculoides), and ± mm for Grayleaf Wil- low (S. glauca). The mean weights per twig were ± g, ± g, and ± g for the three species, respectively. Balsam Poplar {Fopulus balsamifera) is a browse species in other regions of Alaska and was included in the sampling. Balsam Poplar has a mean weight per twig of ± g for a4-mm twig (Wolff and Zasada 1979). The amount of browse available ranged from to kg/ha. This is within the range reported by Wolff and Zasada (1979) for 16 stands in interior Alaska. Salix alaxensis made up 90% of the browse available in all stands followed by S. arhusculoides, S. glauca, and P. bal- samifera. Diamondleaf Willow {S. planifolia) was also present in the study area but not in our plots. American Green Alder {AInus crispa) was present in most study areas but was infrequently browsed. Pref- erence was shown for S. alaxensis, followed by 5". arbusculoides, S. glauca, and P. balsamifera. At a daily consumption rate of 5 kg dry weight per Moo
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