. The Canadian field-naturalist. 1987 Barclay-Estrup: Mountain Bilberry in Pakaskwa 527 / WEIGHTED MEAN ANNUAL PH OF PRECIPITATION. Figure 1. Pukaskwa National Park, Ontario, Canada. Isolines of the weighted mean annual pH of precipitation are also included. check-lists of vegetation found along the Lake Superior coast. A more detailed study of forest types, including a check-Ust, has been done by Gimbar- zevsky et al. (1978). The study area has not been affected by logging since it is quite inaccessible. The study lakes are situated in areas that tend to be fire-resistant owing to the humid c
. The Canadian field-naturalist. 1987 Barclay-Estrup: Mountain Bilberry in Pakaskwa 527 / WEIGHTED MEAN ANNUAL PH OF PRECIPITATION. Figure 1. Pukaskwa National Park, Ontario, Canada. Isolines of the weighted mean annual pH of precipitation are also included. check-lists of vegetation found along the Lake Superior coast. A more detailed study of forest types, including a check-Ust, has been done by Gimbar- zevsky et al. (1978). The study area has not been affected by logging since it is quite inaccessible. The study lakes are situated in areas that tend to be fire-resistant owing to the humid climate, dissected topography, areas of open rock, and many lakes. Alexander (1978, 1980) has described some of the fire history of Pukaskwa. While logging and fire have had little effect on the vegetation of the study areas, Spruce Budworm {Choristoneura fumifera) is an important biotic factor. The moderate to severe infestation of Spruce Budworm in the park from 1975 to the present has resulted in considerable modification of the Balsam Fir {Abies balsamea) and White Spruce {Picea glauca) components of the forest. Methods The study area (Figure 1) in Pukaskwa National Park was visited three times: 12 September 1984, 21 May 1985, and 18 June 1985. As the area is remote and the terrain is difficult, transport to the lake study areas was by a float-equipped Bell 206B helicopter. Eight lakes, previously studied for lake and soil characteris- tics, were visited for vegetation studies. These were carried out near soil pit study areas. Table 1 has data for the six lake areas where Mountain Bilberry is present. At each soil pit 10-x-lO-m areas were marked, the dbh (diameter at breast height) was measured for all tree species, species lists were prepared, and cover estimations were made. General area species lists were also made as time permitted. (Details of these studies are in Barclay and Viitala 1983). Some collections were made of not readily identifiable species. Mountain Bilberr
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