Research ArticleArticles

Pruning Affects Tree Movement in Hurricane Force Wind

Edward F. Gilman, Forrest Masters and Jason C. Grabosky
Arboriculture & Urban Forestry (AUF) January 2008, 34 (1) 20-28; DOI: https://doi.org/10.48044/jauf.2008.004

Article Figures & Data

Figures

  • Figure 1.
    Figure 1.

    Relationship between fresh foliage weight and diameter of the branch on which foliage was borne on 45 branches from three trees.

  • Figure 2.
    Figure 2.

    Wind speed traces of each tree tested showing wind speed over the 300 sec long test.

  • Figure 3.
    Figure 3.

    Pitch (bending angle from vertical) of the trunk 75 cm (30 in) below the estimated center of gravity in the canopy blown from 15 m/s (37 mph) to 45 m/s (110 mph) for 20 trees receiving four pruning types. Each data point is the mean of 50 data points collected each second.

  • Figure 4.
    Figure 4.

    Pitch (bending angle from vertical) of the trunk in the estimated center of gravity in the canopy blown from 15 m/s (37 mph) to 45 m/s (110 mph) for 20 trees receiving four pruning types. Each data point is the mean of 50 data points collected each second.

  • Figure 5.
    Figure 5.

    Pitch (bending angle vertical) of the trunk 75 cm (30 in) above the estimated center of gravity in the canopy blown from 15 m/s (37 mph) to 45 m/s (110 mph) for 20 trees receiving four pruning types. Each point is the mean of 50 data points collected each second.

  • Figure 6.
    Figure 6.

    Tree that was not pruned bending with 45 m/s (110 mph) wind. The lower (just below canopy) and middle (inside canopy) orientation sensors are shown mounted on a bracket constructed of metal and wood. The top sensor is hidden higher in the crown. Three wires are shown on the trunk and ground; each sends sensor data to the Multifunction DAQ.

Tables

  • Table 1.

    Slope (bending angle from vertical) away from the wind source of the top, middle, and bottom orientation sensors on trees pruned with four different types and blown in 45 m/s (110 mph) winds.z

    Pruning typeBottom sensor 75 cm (30 in) below center of gravityMiddle sensor at center of gravityTop sensor 75 cm (30 in) above center of gravity
    Not pruned27.0 a35.7 a45.8 a
    Raised  9.8 b19.1 b30.8 ab
    Thinned12.1 b15.2 b23.1 bc
    Reduced10.3 b12.6 b16.9 c

    • ↵zMeans (of five trees) in a column followed by a different letter are statistically different at P < 0.01.

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Pruning Affects Tree Movement in Hurricane Force Wind
Edward F. Gilman, Forrest Masters, Jason C. Grabosky
Arboriculture & Urban Forestry (AUF) Jan 2008, 34 (1) 20-28; DOI: 10.48044/jauf.2008.004
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