| Summary: | 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.
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