杉木实生及无性系人工林生长规律的研究

Growth comparison of seedling and clonal trees of Cunninghamia lanceolata

通过测算杉木实生林与无性系林的生长因子数值,建立测树因子与林龄的回归模型,选取不同生长因子的最优生长模型,采用分层切割法及树干解析法对广西省苍梧县天洪岭林场23年生实生杉木林和21年生无性系杉木林的生长规律进行研究。结果表明,2种人工林的胸径、树高及材积总生长量都随着林龄的增加而增大;2种杉木人工林胸径、树高及材积的平均生长量和连年生长量呈现出波动式生长,从2种生长量曲线的走势上看,实生林的平均生长量和连年生长量曲线波动幅度较大,但无性系林的生长趋势要强于实生林。可见,杉木无性系的生长量比实生林更具优势,具有更高的生长稳定性和生长潜力,更符合杉木人工林"速生、丰产、优质"的培育目标。

The hierarchical cut method and stem analysis have been used to compare the Cunninghamia lanceolata growth of23 year-old seedlings trees and 21 year-old clone trees. Through the growth factor measure,factor regression model and age regression model were establised,finally the optimum growth modle of different growth factor was obtained. The results showed that the DBH,the tree height and the total volume growth of two types were increased by age. The average growth and annual growth of the DBH,the tree height and the total volume were showed a fluctuating form. From the trend of the twice growth curves,the growth fluctuation range curves' trend of seedling trees was known as stronger than that of clone trees,but as for the growth trend,clone trees were stronger than seedlings trees. So the clone growth was better than that of seedling,also with higher growth stability and potential.