Infering Regeneration Mechanisms of Chamaecyparis obtusa var. formosana at Chilan Shan, Northeastern Taiwan via Tree-ring Analysis

• Main Authors: Wan-Ting Tsan, 詹琬婷
• Other Authors: Biing-Tzung Guan
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/61098421715550830855

碩士 === 國立臺灣大學 === 森林學研究所 === 92 === To understand the growth trajectory and the possible regeneration mechanism of Taiwan yellow false cypress (Chamaecyparis obtusa var. formosana), tree-ring images based on the cross-sectioned discs of nine tree stumps from Chilan Shan area of northeastern Taiwan were analyzed. Results suggested that the nine trees were established in four distinctive periods, namely, in 1000~1100’s, 1200~1300’s, 1550’s, and 1750~1800’s. Radial growth chronologies exhibited a series of major to moderate releases about every 100 to 200 years. However, the asynchronous nature of these releases suggests that they were caused by a series of small-scale disturbances. Based on these results and the average growth rates of the first 10 and 20 years of the nine trees analyzed, it is believed that as a whole Taiwan yellow false cypress could maintain its local population via tree-replacement regeneration alone.