The influence of canopy cover on understorey development in forests of the western Cascade Range,Oregon, USA |
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| Authors: | G H Stewart |
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| Institution: | (1) Department of Botany and Plant Pathology, Oregon State University, 97331 Corvallis, OR, USA;(2) United States Department of Agriculture Forest Sciences Laboratory, 97331 Corvallis, OR, USA;(3) Present address: Forestry Research Centre, Forest Research Institute, Box 31-011, Christchurch, New Zealand |
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| Abstract: | Natural disturbances, especially fire and treefalls, influence tree canopy composition in the Pseudotsuga menziesii forests of the western Cascade Range, Oregon. The composition of tree, shrub, and herb assemblages in the understorey of stands with different canopy types, such as maturing Pseudotsuga, Tsuga heterophylla, or mixed species stands, also differs.Differences in both canopy type and the prevalence of canopy openings correlated with different degrees of understorey development in stands of similar ages. This suggests that understorey assemblages also reflect disturbance history. Before understorey assemblages can be used to relate community samples to community or habitat types, the extent to which their composition reflects long term influences of stand history vs. differences in site potential must be determined. |
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| Keywords: | Abies amabilis Abies procera Disturbance Overstorey Pseudotsuga menziesii Succesion Tsuga heterophylla Understorey |
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