云南松不同家系苗木生物量分配及其异速生长

Biomass allocation and its allometric growth of Pinus yunnanensis seedlings of different families

【目的】旨在探明不同家系云南松苗木器官生物量分配格局及其异速生长现象,了解苗木的个体发育规律及适应策略。【方法】对10个家系310株云南松苗木的生长及生物量相关指标进行调查,利用单因素方差分析比较不同家系苗木的生物量及其分配差异,并采用标准化主轴分析法对其异速生长关系进行分析。【结果】(1)不同家系苗木生物量的积累与分配存在差异,但各器官生物量的分配均表现为叶>茎>根。苗木个体越小,叶生物量占比越大,随着个体大小的增加,倾向于将更多的生物量分配到茎。(2)苗木器官生物量间及器官生物量与个体大小间的异速生长关系在不同家系中不尽相同,总体表现为等速生长。(3)地上生物量与根生物量间及茎生物量与根生物量间具有共同的异速生长指数,分别为1.054和1.209。不同家系苗木既存在等速生长又具有异速生长现象,异速生长关系并不一致。【结论】异速生长关系在不同的家系中并不唯一,既有趋同适应又存在差异,反应了苗木的生长与适应策略。

[Objective]This paper aims to reveal the biomass allocation and allometric relationships from different families,and to analyze their ontogenetic law and adaptive strategy of seedlings.[Method]The growth and biomass indexes of 310 Pinus yunnanensis seedlings from 10 families were investigated.Oneway ANOVA was used to compare the differences in biomass and biomass allocation of seedlings from different families,and the allometric relationship was analyzed by standardized major axis analysis.[Result](1)The biomass accumulation and allocation were different among varied families,the biomass allocation in each organ was ordered by leaf>stem>root,the biomass allocation of seedlings was constrained by its individual size,and the smaller the individual size was,the larger the leaf biomass ratio was,while the larger the individual size was,the more the stem biomass ratio was.(2)The allometric growth relationships within the plant organ biomass and organ biomass to individual size were quite discrepant,but the growth relationships were isometric overall.(3)The biomass pair aboveground and root biomass,stem and root biomass of seedlings exhibited a common allometric scaling exponent index of 1.054 and 1.209,respectively.The seedlings of different families had both isometric and allometric relationships.[Conclusion]There is no consistency allometric growth relationship among different families,but it represents the growth and adaptation strategies of seedlings.