不同林龄杉木叶经济性状的变异特征

Variation Characteristics of Economic Traits of Chinese Fir Cunninghamia lanceolata Leaves

以不同林龄杉木叶干重比、比叶面积、比叶重3个叶经济性状指标为研究对象,利用ANOVA分析方法、Pearson相关分析方法、线性回归方法分析杉木不同发育阶段的性状间的差异以及性状间相关关系,以探究植物叶片的干重投资-回报规律.结果表明:(1)5与20年生杉木为投资回报急进型,10与15年生为投资回报稳健型;(2)叶片的叶片干重部署和投资预期回报比代谢活力变异性高,中幼龄杉木叶片干重部署和投资预期回报变异性比近熟、成熟林更高;(3)叶片干重部署与代谢活力呈负相关,叶片代谢活力与预期回报呈正相关;5年生杉木叶片代谢活力与干重部署、代谢活力与投资预期回报联系更紧密;(4)叶片代谢活力对预期回报的影响程度为5年生最高.

In this work,SLA（ specific leaf area）,SLM（ specific leaf mass）,LDMC（ leaf dry matter content）and their relationships at 5,10,15,20,25 standing ages of Chinese fir Cunninghamia lanceolata were investigated by ANOVA,Pearson correlation coefficient comparisons and regression analyses in order to understand the rule of leaf dry matter investment and repayment. Our results show the following conclusions.（ 1） The fir with the standing age of 5 and 20 years is progressive in investment return and that of the standing age of 10 and 15 years is relatively conservative.（ 2） The expected leaf return and investment have more variability than metabolic activity,and younger fir is more variable than the older fir.（ 3） Investment and metabolic activities are negatively correlated,while activity and expected return are positively correlated. The metabolic activity is more closely related to the expected return and investment for the fir with the standing age of 5 years.（ 4） The effect of leaf metabolic activity on the expected return is largest for the fir with the standing age of 5 years.