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    Climbers' CornerTree Academy

    Influence of Bark on Mechanics Strain Measures


    Arboriculture researchers have begun utilizing the ARAMIS 3D image correlation systems, introduced to arboriculture by NASA engineers, to understand how trees respond to physical loading. The basic technique is to develop a series of reference points that are captured by the high resolution 3D imaging system and processed to allow for measurements of strain (displacement of wood related to the original length). One potential limitation of the ARAMIS system is that phloem and xylem are separate tissues that can potentially move independently. As such it is possible that the strain measured on the bark may not behave the same as stain in wood fibers beneath the cambial layer. While the bark can be removed to directly measure strain in the wood, it relegates the use of this promising tool to destructive sampling. The presentation will discuss the results of a research project that examines stain in samples with bark on and bark removed. The direct comparison will help determine if bark can be left in place, which would allow individual trees to be monitored over multiple growing seasons.


    Dr. Dahle is an Assistant Professor of Arboriculture and Urban Forestry in the Division of Forestry & Natural Resources at West Virginia University. He holds a doctorate from Rutgers University, a Masters and Bachelors of Science from Purdue University, and is an ISA Board-Certified Master Arborist. Dr. Dahle’s research utilizes allometric modeling and tree biomechanics to understand how urban trees grow and survive environmental loads such as those from snow and ice storms. He has worked as an arborist managing commercial and municipal tree care accounts in the San Francisco Bay Area and served as a consulting utility arborist with the Davey Resource Group throughout northern California. Additionally, he worked with the Bartlett Tree Research Laboratory.

    Climbers' CornerTree Academy

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