가지치기 유형에 따른 양버즘나무 가로수의 목질부 부후와 수관울폐도

초록

We investigated internal wood defects and canopy closure in American sycamore (Platanus occidentalis) street trees under two pruning types (natural form and heading cut). A total of 40 trees were selected in Seoul and Daegu in June and September 2022. Sonic tomography (SoT) and electrical resistivity tomography (ERT) were used to assess internal defects at heights of 30, 60, and 90 cm above the ground. Canopy closure was measured in all four directions around each tree using an Android-based application. In SoT, the natural form in Seoul and Daegu showed no middle decay, late decay, or cavity, whereas the heading cut exhibited all three. Canopy closure was higher in heading cuts (86.0%) than in natural forms (69.9%). As canopy closure increased, internal defects showed a higher occurrence of late decay and cavity. A high occurrence of decay and cavities was observed at a measurement height of 30 cm. A positive relationship was found between canopy closure and the occurrence of internal defects in both Seoul and Daegu. This study provides basic data for the effective management of Platanus occidentalis street trees.

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