Diameter distribution of some subalpine fir stands in central British Columbia |
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Authors: | Pal Varga Karel Klinka |
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Institution: | (1) Department of Forest Sciences, University of British Columbia, 270-2357 Main Mall, V6T 1Z4 Vancouver, British Columbia, Canada |
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Abstract: | Diameter distributions of subalpine fir (Abies lasiocarpa (Hook.) Nutt.) in central British Columbia were investigated. Nine fire-originated, old-growth stands were selected with maximum tree age at breast height of about 300 years. The stage of stand development was determined by testing how well a negative exponential function matched the cumulative diameter distribution. As a comparison, the negative exponential function was also fitted on the frequency distributions. Eight out of the nine distributions showed fewer medium-sized trees and more large-sized trees than predicted by the negative exponential function. One stand showed relatively good fit, but failed the lack-of-fit test. Although the diameter distributions are close to a balanced stage, stand establishment patterns are still evident 300 years after disturbance. |
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