江汉平原引种45年生黑杨派品种生长过程比较

Comparison of Growth Process of 45-year-old Aigeiros Varieties Introduced in Jianghan Plain

以江汉平原引种的3个45年生黑杨派品种‘I-63’、‘I-69’和‘I-72’为研究对象,通过截取不同高度的圆盘进行树干解析,比较不同品种胸径、树高及材积生长过程,旨在为江汉平原黑杨大径材培育提供数据和技术支撑。结果表明,这3个品种的去皮胸径分别达到58.35、61.70、53.60 cm,树高分别为24.84、22.14、27.79 m,去皮材积分别为3.92、3.93、3.11 m^(3)。3个品种的胸径连年生长量最大值分别出现在第5年、第6年、第5年,树龄超过17年后胸径生长明显放缓;树高连年生长量最大值分别出现在第8年、第4年、第6年,树龄超过20年后树高生长接近峰值;材积年平均生长量最大值分别出现在第18年、第15年、第16年。对应3个品种的材积成熟龄,统计发现,‘I-63’、‘I-69’、‘I-72’材积速生期分别在第8~18、6~15、7~16年。整体来看,3个品种都具有较长的寿命和生长期,在江汉平原表现出极好的适应性,相对来说‘,I-69’干型较好,生长表现更为优良,推广价值更高。

This study examined three 45-year-old Aigeiros varieties,‘I-63’,‘I-69’,and‘I-72’,introduced in the Jianghan plain.Tree trunk analysis was performed by sampling discs at varying heights to compare the growth processes of different varieties in terms of diameter at breast height,tree height,and wood volume.The data and technical support provided by this study could contribute to the cultivation of large-diameter Aigeiros varieties timber in the Jianghan plain.The results indicated that the bark-stripped diameters of‘I-63’,‘I-69’,and‘I-72’reached 58.35,61.70 and 53.60 cm,respectively,after 45 years of growth.The tree heights were 24.84,22.14 and 27.79 m,respectively,and the bark-stripped wood volumes were 3.92,3.93 and 3.11 m^(3),respectively.The maximum annual growth in diameter for‘I-63’,‘I-69’,and‘I-72’occurred in the 5th,6th,and 5th years,respectively,with a significant slowdown in diameter growth after the age of 17.The diameter growth slowed down significantly.The maximum annual growth in tree height for‘I-63’,‘I-69’and‘I-72’occurred in the 8th,4th,and 6th years,respectively,with tree height growth approaching its peak after the age of 20.The maximum annual growth in wood volume for‘I-63’,‘I-69’,and‘I-72’occurred in the 18th,15th,and 16th years,respectively,corresponding to the maturity age of wood volume for these three varieties.The statistical data revealed that the fast-growing period of wood volume for‘I-63’,‘I-69’and‘I-72’was from 8 years to 18 years,6 years to 15 years,and 7 years to 16 years,respectively.Overall,all three varietied had long lifespans and growth period,demonstrating excellent adaptability in the Jianghan plain.However,‘I-69’had a superior stem type and superior growth performance,making it more valuable for promotion.