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Arboriculture Glossary of Terms
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| Term | Definition |
|---|---|
| 12-strand rope |
for arborist ropes, a braided rope consisting of 12 strands. Most are coreless. There are two types of 12-strand construction: a tight braid that is not easily spliceable, used for climbing and rigging lines; and a loose, easily spliceable braid, commonly used for slings.
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| 16-strand rope |
for arborist ropes, a braided rope that has a 16-strand, load-bearing cover and a filler core that is not significant in load carrying.
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| 24-strand rope |
for arborist ropes, a braided rope that has a 24-strand cover and is available in double-braided or kernmantle construction.
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| 3-strand rope |
rope construction in which three strands are twisted together in a spiral pattern. Contrast with braided rope and kernmantle rope.
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| 7-strand, common-grade cable |
steel-cable construction in which seven strands are twisted together in a spiral pattern. Used to add supplemental structural support to trees. Terminated by wrapping onto itself.
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| 90-3-90 |
guideline proposed by Alex Shigo that states in 90 percent of trees conflicting with utility lines, three pruning cuts can achieve 90 percent of the required clearance.
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| ABC (aerial bundle cable) |
system of reducing the physical hanging space of aboveground electrical conductors.
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| abiotic |
nonliving.
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| abiotic disorder |
plant malady caused by nonliving, environmental, or man-made agents.
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| abscisic acid (ABA) |
plant hormone that stimulates stomatal closure and promotes seed and bud dormancy. Inhibits shoot growth but may promote root growth. Plays a role in wounding responses and in abscission of leaves and fruit.
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| abscission |
leaf or fruit drop induced by hormonal changes.
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| abscission zone |
area at the base of the petiole where cellular breakdown leads to leaf and fruit drop.
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| absorbing roots |
fine, fibrous roots that take up water and minerals. Most absorbing roots are within the top 12 inches (30 centimeters) of soil.
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| absorption |
taking up. Contrast with adsorption.
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| acceleration |
rate of change of the velocity of an object. Acceleration is a vector quantity. See vector and velocity.
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| access line |
(1) second climbing line hung in a tree in case it is needed to reach a victim in an emergency. (2) climbing line installed in a tree to gain access to, but not used to work, the tree.
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| access route |
defined entrance and exit route for a property during construction, tree work, or landscape operations.
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| acclimation |
physiological adaptation process of plants and other living organisms to a climate or environment different from their native environment or where originally grown.
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| acid |
having a pH less than 7.0. Contrast with alkaline.
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| acidity |
state or quality of being acid. Contrast with alkalinity. See pH.
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