| Summary: | 碩士 === 國立中興大學 === 園藝學系所 === 99 === Parks are the main recreation choice of public to spend their time in their living neighborhoods. Trees that contribute to the aesthetic value in a park may bring certain hazards such as snapping branches and trunk failure that can kill and other potential risks. Thus, detecting and categorizing hazardous trees to enhance the safety level of park should be carried out. In this study, visual tree assessment (VTA), an evaluation tool developed by C. Mattheck was opted in the process of evaluating the Jian-Kang Park trees.
The survey results show that the highest risk (level IV) tree species are Samanea saman at area A, Samanea.saman and Ficus wightiana at area B, Sphatodea campanulata of area C and D. The dangerous symptoms are cavities, sizable co-dominant branches, dry and rotting branches and stubs from tipping, asymmetry crown and fragile epicormic shoots. There are 9 trees in total, with all of them located next to the pathway. 48 trees are of risk level III (high risk), majorly with compression forks at co-dominant branches, epicormic shoots with odd bends, overlifted crowns, non-tapering trunk and asymmetry crowns. Out of 354 trees, 87% were found being topped and flush cut, causing decay and hollow parts, watersprouts which attach at a weak point, asymmetry crown etc. Trees in the park have non-tapering trunk majorly, and they are 72% of the assessed trees. Both topped and non topped trees were found to have long stubs and branches that dry and decay on trees.
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