12-15-1997 Planning Packet - Laserfiche WebLink

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r CITY OF ORONO TREE PRESERVATION POLICY APPENDIX A Technical Terms: Cambium: The tissue within the ut)ody 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(?) of 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. Deciduous: Not persistent; the shedding of lea\es annually. Feeder Roots: A complex system of small annual roots growing outvsard and predominantly up\\‘ard from the system of "transport roots". These roots branch four or more times to form fans or m.ats of thousands of fine, short, non-woody tips. Many of these small roots and their multiple tips are 0.2 to 1mm or less in diameter, and less than 1 to 2mm long. The .e roots constitute the major fraction of a tree’s root system surface area, and are the primary sites ot absorption of water and nutrients. Mainr Woodv Roots: First order tree roots originating at the "root collar" and growing horizontally in the soil to a distance of between 3 and 15 feet from the trees trunk. These roots branch and decrease in diameter to give rise to "rope roots". The primary' function of major woody roots include anchorage, structural support, the storage of food reserv'es, and the transport of minerals and nutrients. Protected Root Zone: The rooting area of a tree established to limit root disturbances. This zone is generally defined as a circle with a radius extending from a tree s trunk to a point no less than the furthest crown dripline. Disturbances w'ithin this zone will directly affect a tree’s chance for survival. Root Collar: The point of attachment of major woody roots to the tree trunk, usually at or near the groundline and associated with a marked 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 suivival. Rope Roots: An extensive network of 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 0.25 to 1 inch in diameter. The primary function of rope