Mechanical properties of primary branches of 29 desert species
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Mechanical Properties of Primary Branches of 29 Desert Species. Christina Pereira. Some are tall and slender with main stem and short primary branches. Some are short and wide with less dominant stem and very long branches. Trees and shrubs show a variety of morphologies. Cercidium floridum.

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Mechanical Properties of Primary Branches of 29 Desert Species

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Mechanical Properties of Primary Branches of 29 Desert Species

Christina Pereira


Some are tall and slender with main stem and short primary branches

Some are short and wide with less dominant stem and very long branches

Trees and shrubs show a variety of morphologies

Cercidium floridum

Pinus ponderosa


Many other tress show other forms and shapes

Cedrus atlantica

Fraxinus cuspitada


To date, there has been very little research into a unifying principle of tree and shrub morphologies

Prunus ilicifolia

Fraxinus velutina


Main Stem

Olive = Primary Branch


Main Stem

Olive = Primary Branch

Green = Secondary Branch


Main Stem

Olive = Primary Branch

Green = Secondary Branch

Orange = Tertiary Branch


Main Stem

Olive = Primary Branch

Green = Secondary Branch

Orange = Tertiary Branch

Blue = Quaternary Branch


  • Mechanical stress is constant from the base to the tip of the branch.

    2. Branches of Desert species will have less mechanical stress than species from New York

    3. The addition of secondary branches is a reiterative process in the mechanical structure of tree branches.

    4. Mechanical stresses of primary branches are constant among tree species

Hypotheses


Mechanical Properties: Bending Moment (M)


Bending Moment (M) [low]

Bending Moment (M) [intermediate]

Bending Moment (M) [high]


Mechanical Properties: Section Modulus (S)


  • Diameter of segment

  • Length of segment

  • Weight of segment

  • Weight of Side branches

Materials & Methods: Measurements


Mechanical Properties: Stress


1. Mechanical stress is constant from the base to the tip of the branch: Desert


Example 2: Pinus thunbergii

1. Mechanical stress is constant from the base to the tip of the branch: New York


Table 1: Properties of tree branches


New York

Combine the two histograms, ny and desert


1st hypothesis: Bending Stresses of desert species are lower than New York species


Alex is correcting the graph

Desert: Proportional Weight vs. Proportional Length and Radius


New York: Proportional weight vs. proportional length and radius


  • Small table of means of desert vs new york slopes

  • Desert = 0.048 slope

  • New york = 0.072 slope

  • T test probability = 0.0072

  • Conclusion: they are different

  • Thus the main reason why have lower stress values have less weight near the tips

Second hypothesis


Desert: Volume/Length vs. Proportional Radius


Need to ask Alex to make graph

New York: Volume/Length vs. Proportional Radius


  • Graph of new york cum v/l

  • Are they different? If so make table

  • Is this enough?

  • If not then we do terminals vs main for desert only


3. The addition of secondary branches is a reiterative process in the mechanical structure of tree branches.


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