Motion-induced growth effects in Douglas fir

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Abstract
Daily brief intervals (30 s) of relatively mild shaking had a marked influence on leader growth of young Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) stems grown in a greenhouse. When the treatment was applied to naturally wind-loaded stems, there was some suggestion that height growth was reduced more than the considerable reduction from wind action alone. Neither the pattern nor magnitude of xylem growth appeared to be affected by the treatment, whereas wind action produced a significant change in the pattern. It is suggested that the response to wind and shaking stimuli may differ.

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