Abaxial: the lower surface of a tree's leaf.Ībility: competence in tree maintenance, doing with what you have a dynamic or kinetic process.Ībiotic: pertaining to the nonliving parts of an ecosystem, such as soil particles, bedrock, air, water.Ībscisic acid (ABA): a plant hormone that stimulates stomatal closure and promotes seed and bud dormancy.Ībscission zone: a wall of cells at the base of a petiole, that allows the leaf to separate from the stem.Īcaulescent: a plant having no stem or appearing to have none.Īcceptable risk: t he amount of risk that an owner is willing to accept should a whole tree or tree part fail.Īccess point: the establishment of a location used to enter a site.Īcid ic soil: having a pH less than 7.0, in contrast with alkaline which has a pH that is higher than 7.0.Īctinomycetes: microorganisms that have some characteristics of fungi and bacteria.
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