Analysis of Stand Characteristics and Establishment of Growth and Yield Models for Taiwania（Taiwania cryptomerioides）Plantations

• Main Authors: Zheng-Rong Lin, 林政融
• Other Authors: Tian-Ming Yen
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/32446251839599076445

碩士 === 國立中興大學 === 森林學系所 === 104 === The purpose of this study was to analyze the growth and yield of Taiwania（Taiwania cryptomerioides） plantations with a large-scale study areas. Moreover, four diameter at breast height (DBH) classes according to tree sizes were classified for each stand, namely DBH classes I, II, III and IV. A total of 32 permanent sample plots with two repeated measurements (4-6 years) were obtained. Correlation analysis was used to analyze stand characteristics with the three factors. On DBH, it was positively correlated with site and stand density, except for DBH-class I and stand density on DBH-class II. In tree height, it was positively correlated with all three factors. The pattern of growing stock was similar to tree height, except for age on DBH-class I. In the number of survival trees, it was positively correlated with stand density, and it was also positively correlated with age on DBH-class Ⅲ and Ⅳ. The relationship between three factors and the change values of stand characteristics based on the correlation analysis showed that, in diameter growth , it was negatively correlated with age and stand density, except for stand density on DBH-class Ⅰ and Ⅳ. In tree height growth, it was negatively correlated with all three factors, except for site on DBH-class Ⅰand stand density on DBH-class Ⅱ. However, it was only negatively correlated with site on DBH-class Ⅲ and Ⅳ. In volume growth, it was positively correlated with stand density, except for DBH-class Ⅰ and Ⅱ. Besides, it was positively correlated with age on DBH-class Ⅰ. In volume growth rate, it was negatively correlated with age and stand density. In the number of survival trees changed, it was no significantly correlated with any factor. In the rate of survival trees changed, it was no significantly correlated with any factor, except for stand density on DBH-class Ⅱ and Ⅳ. Analysis of variance（ANOVA）was used to differe DBH classes in different terms. In the DBH growth, the trends showed that the larger the DBH classes was, the larger DBH growth become, except for side DBH classes. In the volume growth, the trends showed that the larger the DBH classes was, the more the volume growth become, except for DBH-class Ⅰ to Ⅱ. In the number of survival trees changed, the trends showed that the larger the DBH class was, the less the number of survival trees changed, except for DBH-class Ⅰ to Ⅱ and DBH-class Ⅱ to Ⅲ. In the rate of survival trees changed, the trends showed that the larger the DBH class was, the less the rate of survival trees changed, except for DBH-class Ⅱ to Ⅳ. The simulation results showed that Perala（1971）model（R2adj = 0.994, RMSE = 21.583 m3 ha-1）was superior to other nine yield models.