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APR 04 '97 10:04AM TPAVELllAYS <br />TREK PRFSFftVAnON POLTCY PITY OF ORONO <br />Technical Terms: <br />APPENDIX A <br />Cambium: The tissue within the woody portion of trees and shrubs which gives rise to the <br />woody water and nutrient conducting system, and the energy substrate transport system in <br />trees <br />Cambial dieback: 7 he irreparable radial of vertical inteiruption of a tree's cambium, usually <br />cause*,’ by mechanical damage, such as "skinning bark", or from excessive heat. <br />Coniferous: Belonging to the group of cone-bearing evergreen trees or shrubs. <br />Deciduous: Not persistent; the shedding of leaves annually. <br />Feeder roots: A complex system of small annual roots ^if-owing outward and <br />predominantly upward from the system of "transport roots" These roots branch four or <br />more times to form fans or mats of thousands of fine, short, non-woody tips. Many of <br />these small roots and their multiple tips are 0.2 to 1mm or less in diameter, and less than 1 <br />to 2mm long. These roots constitute the major fraction of a tree's root system surface <br />area, and are the primary sites of absorption of water and nutrients, <br />Major Woody Roots: First order i roots ori^atlng at the "root collar" and growing <br />horizontally in the soil to a distance ^'between 3 and 15 feel from the tree's trunk. These <br />roots branch and decrease in diameter to give ri.se to "rope roots". The primary fruiction of <br />major woody roots include anchorage, struc iw .n support, the storage of food reserves, <br />and the transport of minerals and nutrient-^ <br />Protected Root Zone: The rooting area of a tree cstablisned to limit root disturbances. <br />This zone is generally defined as a circle \vitli a radius extending from a tree's trunk to a <br />point no less than the furthest crown dripline. Disturbances within this zone will directly <br />affect a tree's cliance for survival. <br />Root Collar: The point of attachment of major woody roots to the tree trunk, usually at or <br />near the gruundline and associated with a marked sw’elling of the tree trunk. <br />Root Respiration; An active process occurring throughout the feeder root system of trees, <br />and involving tlie consumption of ox>gen and sugars with the release of energy ^nd <br />carbon-d’.oxide. Root respiration facilitates the uptake and transport of minerals and <br />nutrients essential for tree survival.