杭州古树树干空洞状况调查研究

使用Fakopp声纳探测仪对杭州市113株古树树干的内部腐烂空洞情况进行检测。按树干内部空洞的比例大小，将古树空洞程度分划为无空洞、轻度空洞、中度空洞、重度空洞4个等级，检测结果显示，古树空洞程度各个等级所占比例分别为25.7%、15.9%、 30.1%、 28.3%。在此基础上对古树空洞形成的原因进行分析，并提出了保护措施。

Health Status of Old Trees in Hangzhou

Based on the investigation on 113 old trees in Hangzhou, this paper detected the conditions of internal rotten holes by Fakopp sonar detector. According to ratio of the rotten sections to the total area of the sections, these trees were classified into 4 levels, including nil, light, moderate, and heavy hollows. The proportion of the 4 levels accounted for 25.7%, 15.9%, 30.1%, and 28.3%, respectively of 113 trees surveyed. Main factors of forming hollows in the trees were discussed, countermeasures were put forward.