钻形紫菀开花期种群构件的生物量分配

Biomass Allocation on the Modules of Aster subulatus Michx. Population at Flowering Stage

在野外用样方法,选取60株钻形紫菀(Aster subulatus Michx.)开花植株,进行根、茎、叶及花等构件的生物量及其物质分配关系的研究。结果表明:钻形紫菀开花期构件生物量为茎>花>根>叶,其变异系数分别为57.15%、64.66%、57.65%和55.2%,具有较大表型可塑性;在各构件物质分配变异系数中,花生物量分配的变异系数相对较大,说明其调节生殖分配的能力较强;植株高度与各构件生物量呈显著的正相关性,随着各构件生物量的增加均呈幂函数形式增加;花生物量分配与总生物量呈显著的正相关性,其余构件生物量分配均与总生物量及花生物量分配呈负相关性,物质分配由营养构件、支持构件、光合构件向生殖构件转移。反映出钻形紫菀具有自我调节生长力的分配策略,对异质环境具有较强适应能力。

The biomass of root, stem, leaf and flower, as well as the relationship of biomass allocation were studied from 60 flowering plants of Aster subulatus Michx. in the field. The results showed that the module biomass of A. subulatus was decreased in the order of stem 〉 flower 〉 root 〉 leaf at flowering stage. Their variation coefficient was 57.15%, 64.66%, 57.65%, and 55.2%, respectively, which exhibited high phenotypic plasticity. The variation coefficient of biomass ratio was higher in flower than in other organs, which showed that this weed had high ability to adjusting reproduction allocation. Plant height had significant positive correlation with each module biomass and increased in the power function with the latter increment. Biomass allocation of flower had significant positive correlation with total biomass, but did not that of other organs. The biomass allocation was transferred from nutrition module, supporting module and photosynthesis module to reproduction module. In summary, A. subulatus had better assignment strategy for resource and stronger adaptive ability to heterogeneous environment.