Vegetation of talus slopes on the Liard Plateau, British Columbia
Polster, D. F.; Bell, M. A. M.
The vascular plant vegetation on limestone talus slopes in an east-west valley on the Caribou Range in northern British Columbia was described and classified. Five community types were differentiated by six species groups derived by modified Braun-Blanquet techniques. The most widespread and/or physiognomically prominent species include Saxifraga tricuspidata, Dryas integrifolia, Salix reticulata, S. glauca, S. lanata, Carex scirpoidea, Polygonum viviparum, and Silene acaulis. Major factors influencing vegetation pattern appear to be slope stability and aspect, and soil moisture. Colonization and community succession are strongly influenced by substrate stability and moisture availability. Succession is initiated on coarse-textured south-facing slopes by mat-forming species such as D. integrifolia and Arctostaphylos rubra and on fine textured northern aspects often by the shrubs Salix polaris, S. alaxensis, and S. lanata.