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Categories All categories Arboriculture Terms
i
- introductionin Plant Health Care. the intentional l release or planting of a non-native species within a landscape.
- invasive speciesnon-native organisms that have spread beyond their natural range. disrupting the balance of an ecosystem. ]
- IoHInstitute of Horticulture
- ionatom or a group of atoms with a positive or negative charge. ~ l
- IPMIntegrated Pest Management
- ISAInternational Society of Arboriculture
- ISOInternational Standards Organization
- ITCCInternational Tree Climbing Championship
- IVMIntegrated Vegetation Management
j
- JCLIJoint Council for Landscape Industries
- job briefingbrief meeting of a tree crew at the start of every job to communicate the work plan. responsibilities and requirements. and any potential hazards.
- job descriptionduties to be performed in a job.
k
- kerfslit or cut made by a saw. Space created by a saw cut (the width of the chain or blade).
- kerf cutscuts made to prevent fiber tearing from a branch or trunk section being removed.
- key performance indicators (KPI)measureable objectives to assess performance and progress toward goals.
- key pestorganism that is frequently encountered in landscapes and predictably causes injury to plants.
- key plant1) plant species that has a high incidence of pest problems due to inherent susceptibility or common mismanagement. 2) plant specimen that has significant value in a landscape.
- kickbacksudden. sometimes violent and uncontrolled. backward or upward movement of a chain saw.
- kickback quadrantupper quadrant of the tip of a chain saw bar.
- kilonewton (kN)unit of force. Amount of force required to move 1.000 kg a single meter in a single second (equals 224.8 pounds force).
- kilovolt (k V)1 .000 volts. Unit used for the measurement of electrical force.
- kinetic energyenergy an object has due to its motion.
- kingdomprimary taxonomic group. separating plants from animals.
- kinked rootSharply bent root
- kNkilonewton
- knot1) any of various fastenings formed by looping and tying a rope (or cord) upon itself or to another rope or to another object. 2) imbedded remnant of a branch in a tree or cut timber. often harder than surrounding wood.
- knot tenderin climbing. a device or knot used to assist in advancing the climbing hitch and to control the entry of line into the hitch.
- knotless systemrigging system in which loop slings and connecting links are used to attach branches or wood sections to the lowering line.
- kVkilovolt
- kWkilowatt
l
- lag eyelag-threaded. drop-forged. closed-eye cable anchor used for dead-end systems.
- lag hook (J-hook)lag-threaded. J-shaped cable anchor.
- landing zonepredetermined area where cut branches or wood sections will be dropped or lowered from a I tree (see drop zone).
- landscape functionpurpose or intended use of a plant I in the landscape (e.g.. shade. aesthetics. screening).
- lanyardshort rope equipped with carabiners. snaps. and/or eye splices. Work-positioning lanyards are used for temporarily securing a climber in one place. (see buckstrap. work-positioning lanyard. safety lanyard and flip line).
- larvaimmature life stage of an insect between the egg and the pupa stage.
- lashingan arrangement of rope used to hold two I objects together.
- latent budbud held in dormancy for more than one year by hormones originating from the terminal bud. Term sometimes used to refer to dominant buds or adventitious buds.
- secondary or subordinate branch or root.
- lateral budvegetative bud on the side of a stem (contrast with terminal bud).
- lateral rootroot that arises by cell division in the pericycle of the parent root and then penetrates the cortex and epidermis.
- lateral root or branchSecondary root or branch arising from a primary root or branch
- LCRlive crown ratio
- LDSOlethal dose to 50 percent of the test population
- leachR moval of mate
- leach (leaching)1) tendency for elements or compounds to wash down through the soil. 2) tendency for elements or compounds to wash into the soil. For example. alkaline compounds may leach from concrete or heavy metals may leach from aggregates.
- leadpart of a rigging line. from the rigging point to the load (contrast with fall).
- leaderprimary terminal shoot or trunk of a tree. Large. usually upright stem. A stem that dominates a portion of the crown by suppressing lateral branches.
- leafprimary. photosynthetic organ of a plant that is connected to a stem by a petiole.
- leaf apextip of the leaf blade.