南川木波罗幼苗构件生物量和叶片特征随年龄增长的变化

摘要

SLA,LDMC and modules dynamics of Artocarpus nanchuanensis in Chongqing were studied systematically. The results showed that with the increase of A .nanchuanensis seedling ages,the biomass of the single A .nanchua-nensis increased significantly,in which the difference of branch biomass was the biggest,the disparity even to 477.23 times between 2 and 5 age seedlings.The reserved modules biomass generally allocated in the order:branch biomass>leaf biomass>root biomass.The average biomass distribution rate of stem and branch increased generally,leaf rati-o decreased,root ratio changed small.It showed that the chance to receive biomass varied among different modules. Branches had priority over stems in this aspect.With the increase of A .nanchuanensis seedling ages,the trend of SLA change was increased firstly,then decreased,and SLA of one-year-old leave was higher than those of two-year-old.At the same time,LDMC increased generally,but LDMC of current year leave was higher than those of one year.%为深入了解南川木波罗构件种群生物量、比叶面积及叶干物质含量随苗龄叶龄的变化规律,以南川木波罗幼苗(1~5年生)为研究对象,分析其根、茎、叶等构件种群的生物量、SLA、LDMC 差异及动态变化.结果表明：(1)单株生物量随着苗龄增加而增加,且差异达显著性水平；(2)各构件生物量增加的幅度不尽相同,其中枝条生物量增长幅度最大,5年生幼苗与2年生幼苗相比达477．23倍,其余构件生物量为主干＞叶＞根；(3)枝条和主干的生物量比率总体上呈上升趋势,所占根比率变动较小而叶逐渐下降.表明植物体对各构件生物量投资的不均衡性,主要偏向于枝和主干；(4)SLA 随着苗龄的增加呈先上升后降低的趋势,且当年生叶大于1年生叶；幼苗叶片干物质含量(LDMC)随苗龄增加而增加,且1年生叶均高于当年生叶.