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• W61224379 abstract "Coastal British Columbia is the focus of conflict between timber extraction and protection of forest components such as forage plants consumed by black bears. To protect foraging habitat and to enhance forage plant abundance, researchers and managers must understand habitat requirements of these forage plants. Also, because forest managers increasingly use partial cutting as primary silvicultural treatment, forest managers must know how partial cutting affects the abundance of understory plants. I assess the community structure of plants consumed by black bears in the Nimpkish Valley, British Columbia, with respect to environmental gradients. I also survey the literature for evidence about effects of pattern (spatial arrangement) and intensity (amount of timber removed) of partial cutting on understory species. Non-metric multidimensional scaling (NMS) ordination revealed that variation in community structure of forage plants was related to soil nutrient and moisture content, elevation, and tree overstory dominance. Of these three factors, soil nutrient and moisture content were most strongly related to forage plant communities, while tree overstory dominance was the most weakly related factor. Species richness of forage plants and abundance of invasive forage plants generally increased with increasing soil nutrient and moisture content and with decreasing tree overstory dominance. Compared to invasive forage plants, residual forage plants did not respond consistently to any of the three factors revealed by the ordination. However, abundance of many residual forage plants was depressed where tree overstory dominance was high. To maintain the quality of foraging habitat, forest managers should: (1) prioritize for protection some forests with nutrient rich and moist soils; (2) ensure these forested sites are distributed across the biogeoclimatic variants occupied by black bears; (3) where harvesting occurs in these forested sites, avoid harvesting regimes resulting in large areas with a dense, structurally homogeneous tree cover. The partial cutting literature revealed that short-term understory dynamics are a function of intensity and pattern of disturbance. Increasing the cutting intensity increases the short-term abundance of invasive species and decreases the abundance of forest-interior species. In the long-term, dispersed retention ameliorates the depauperate understory phase observed after crown closure in previous clearcuts." @default.
• W61224379 created "2016-06-24" @default.
• W61224379 creator A5038975728 @default.
• W61224379 date "2004-01-01" @default.
• W61224379 modified "2023-09-27" @default.
• W61224379 title "A study of forest understories in two parts : community structure of forage plants consumed by coastal black bears and effects of partial cutting on understory" @default.
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