臺灣南部大葉桃花心木徑向生長量季節性差異之研究

Radial Growth Increment of Mahogany Growing in Southern Taiwan

鍾智昕(Chih-Hsin Chung) ； 林謙佑(Qian-You Lin) ； 林振榮(Cheng-Jung Lin)

《中華林學季刊》 46卷1期 (2013/03) Pp. 15-26

摘要

The purpose of this study was to investigate the radial growth increment and ring density of different growth stages on mahogany (Swietenia macrophylla K.) plantation trees in southern Taiwan by wounding window method. From December 2008 to November 2009, one year can be classified into four stages (Dec. 2008-Fre. 2009 (P1), March 2009-June 2009 (P2), July 2009-Aug. 2009 (P3), and Sep. 2009-Nov. 2009 (P4), respectively) for understanding the effects of different seasons on radial growth increment and corresponding ring density. The radial growth increment showed a trend as follows: P3＞P4＞P2＞P1, however, the corresponding density displayed a trend as follows: P1＞P4＞P2＞P3. This indicates that the larger radial growth increment and lower density are associated with wet season, while smaller radial growth increment and higher density are typical for dry season. There was different between dry and wet season for radial increment, but not exist for ring density. The marginal axial parenchyma bands are formed during the latest dry season or early rainy season, and the bands have minimum density in a ring by ring density profile. There were very significant positive relationships between radial growth increment and climate factors (including air temperature, mean precipitation a month, and mean monthly relative humidity). However, there was no correlation between ring density and climate factors. The mean monthly relative humidity and mean sunshine hours a month are best predicts for radial growth increment by multiple stepwise regression.

關鍵字

端生薄壁細胞 ； 樹輪 ； 創傷開窗法 ； 徑向生長量 ； 氣候

並列摘要

The purpose of this study was to investigate the radial growth increment and ring density of different growth stages on mahogany (Swietenia macrophylla K.) plantation trees in southern Taiwan by wounding window method. From December 2008 to November 2009, one year can be classified into four stages (Dec. 2008-Fre. 2009 (P1), March 2009-June 2009 (P2), July 2009-Aug. 2009 (P3), and Sep. 2009-Nov. 2009 (P4), respectively) for understanding the effects of different seasons on radial growth increment and corresponding ring density. The radial growth increment showed a trend as follows: P3＞P4＞P2＞P1, however, the corresponding density displayed a trend as follows: P1＞P4＞P2＞P3. This indicates that the larger radial growth increment and lower density are associated with wet season, while smaller radial growth increment and higher density are typical for dry season. There was different between dry and wet season for radial increment, but not exist for ring density. The marginal axial parenchyma bands are formed during the latest dry season or early rainy season, and the bands have minimum density in a ring by ring density profile. There were very significant positive relationships between radial growth increment and climate factors (including air temperature, mean precipitation a month, and mean monthly relative humidity). However, there was no correlation between ring density and climate factors. The mean monthly relative humidity and mean sunshine hours a month are best predicts for radial growth increment by multiple stepwise regression.

並列關鍵字

Marginal parenchyma ； Tree ring ； Wounding window method ； radial growth increment ； climate