Agenda - Council - 09/27/1994 - Laserfiche WebLink

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APPENDIX A TECHNICAL TERMS CAMBIUM * tissue within the woody portion of trees and shrubs which gives rise to the woody water and nutrient conducting system, and the energy substrate transport system in trees. CAMBIAL DIEBACK - the irreparable radial or vertical interruption of a tree's cambium, usually caused by mechanical damage, such as "skinning bark", or from excessive heat. CONIFEROUS - belonging to the group of cone-bearing evergreen trees or shrubs. CRITICAL ROOT ZONE - the rooting area of a tree established to limit root disturbances. This zone is generally defined as a circle with a radium extending from a tree's trunk to a point no less than the furthest crown drip line. Disturb.'mces wilhin this zone will directly affect a tree's ch:race for survival. DECIDUOUS - belonging to the group of trees or shrubs which shed leaves annually. FEEDER ROOTS - a complex system of small annual roots growing outward and predominantly upward from the system of "transport roots". These roots branch four or more times to form fans or mats of thousands of fine, short, non-woody tips. Many of these small roots and their multiple tips are 0.2 to 1 mm or less in din. meter, and less than 1 to 2 mm long. These roots constitute the major fraction of a tree's root system surface area, and are the primary sites of absorption of water and nutrients well beyond the dripline. ROOT COLLAR - the point of attachment of major woody roots to the tree trunk, usually at or near the g'roundline and associated with a m;u-ked swelling of the tree trunk. ROOT RESPIRATION - an active process occurring throughout the feeder root system of trees, and involving the consumption of oxygen and sugars with the release of energy and carbon-dioxide. Root respiration facilitates the uptake and transport of minerals and nutrients essential for tree survival. ROPE ROOTS - an extensive network or woody second order roots arising from major woody roots, occurring within the surface 12 to 18 inches of local soils, and with an average size ranging from .25 to 1 inch in diameter. The primary function of rope roots is the transport of water and nutrients, and the storage of food reserves. SOIL COMPACTION - a change in soil physical properties which includes an increase in soil weight per unit volume, and a decrease in soil pore space. Soil compaction is caused by repeated vibrations, frequent traffic and weight. As related to tree roots, compacted soil can cause physical root damage, a decrease in soil oxygen }evels with an increase in toxic Sasses, and can be impervious to new root development. TRANSPORT ROOTS - the system for framework of tree roots cornprised of major woody roots and rope roots.