Abstract
The purpose of this year was to explore the tree health grades by visual tree assessment and under refer to the International Association of Arboriculture and Japan Tree Medical Association. Firstly, the tree medical center of Taiwan Forestry Research Institute provided the tree health service for understanding the tree health grade status by visal tree assessmnet. The objectives of this year was 8 tree species. When the visually inspect 8 different species of trees and dangerous shortcomings appearance characteristics, in turn establish visual tree inspection database. Secondly, the tree health grades and trunk health were evaluation by different nondestructive techniques, in order to establish a standard of 10 different species data bank, the evaluation standard parameter of new technologies that detect trees was established. Finally, tree hazard and risk assessmnet were built and datdbase creation for understanding health grades of 10 tree species based on different levels of standard specification and databases with visual tree assessment and nondetructive techniques. The main purpose of this project is to detect tree rings and evaluate tree age, select camphor tree, Taiwan zelkova, tea tree and stout camphor trees are sampled trees, drill core by increment core and produce specimen, tree-ring density profile by x-ray scanning technology for tree annual ring, professional design assistance artificial tree rings do know software to analyze characteristics of tree rings, and then confirm the age of tree rings.