Effect of mechanical stress on growth and anatomical structure of red pine: stem vibration

Two studies were made of the effects of stem vibration on tree growth and anatomical structure. Vibration was used to simulate wind sway.The results of a greenhouse and an outdoor study were not consistent but did suggest that vibration might cause a short-term reduction in growth. There was no evidence that the level of vibration used caused any change in wood structure.Soil moisture affected anchorage of the tree in the soil. This, in turn, affected lateral displacement resulting from vibration and influenced the redistribution of the new volume growth.