不同生境下荠菜种群构件生物量分配特征

Biomass Allocation Characteristics of Capsella bursa-pastoris Populations in Different Habitats

采取大样本取样法,对林缘、路边及裸地3种生境下的荠菜(Capsella bursa-pastoris)种群进行了构件生物量结构及异速生长的分析。结果表明:不同生境下的荠菜植株在株高和构件生物量上均存在差异,其中裸地荠菜植株的株高最高、总生物量最大,路边荠菜次之,林缘荠菜最低。3种生境下荠菜生物量分配的变异系数均低于50%,表型趋于稳定。3种生境下荠菜植株大小均随其各构件生物量的增加而增加,其中林缘荠菜植株各构件生物量与植株大小间遵循异速生长规律,而路边和裸地的荠菜植株呈现异速、同速生长并存的现象。荠菜植株在生殖生长和营养生长之间存在权衡,其营养器官生物量会随着繁殖器官生物量的增加而增加,不同生境下其所遵循的规律和速率不同。

In this study,the biomass structure and allometry growth of Capsella bursa-pastoris populations were analyzed in three habitats:forest edge,roadside and naked land by using large sample sampling.The results showed that there were differences in plant height and component biomass of C.bursa-pastoris in different habitats.The plant height and total biomass of C.bursa-pastoris in naked land were the highest,followed by C.bursa-pastoris in roadside and C.bursa-pastoris in forest edge.The variation coefficients of biomass allocation of C.bursa-pastoris under three habitats were all lower than 50%,and the phenotypes tended to be stable.The plant size of C.bursa-pastoris increased with the increase of the biomass of each component in the three habitats.The biomass of each component of C.bursa-pastoris in the forest edge followed the allometric growth law with the plant size,while the plants in the roadside and naked land showed allometric and synchronous growth coexisted.There is a trade-off between reproductive growth and vegetative growth in C.bursa-pastoris.The vegetative organ biomass will increase with the increase of reproductive organ biomass,and the law and rate of vegetative organ biomass are different in different habitats.