不同生境下刺五加种群构件生物量结构与生长规律

从构件水平对针阔混交林、蒙古栎林和次生杂木林3个生境的刺五加种群各功能构件的生物量结构及生物量比率与年龄之间的关系进行了定量分析. 结果表明,刺五加种群的个体生长和各构件生物量动态与环境条件关系密切.不同环境条件下,刺五加种群各功能构件生物量平均值具有相同的规律：茎构件>根茎构件>叶构件.3个生境中刺五加整体种群水平具有一定的相似性.在郁闭度为40%的蒙古栎林中,刺五加种群个体生物量和各构件生物量较针阔混交林和次生杂木林中大.不同生境下刺五加种群分株生物量的差异蕴涵着重要的生长调节和物质分配策略.在分株较小的幼龄个体以及郁闭度较大而不利于分株生长的次生杂木林中,分株优先建造叶器官,以保证充分的物质生产. 3个生境刺五加种群的叶、茎与分株的相对增重均具有相同的幂函数异速生长规律.

Modules biomass structure and growth pattern of Acanthopanax senticosus population in different habitats

In this paper,a quantitative analysis was conducted on the functional modules' biomass structure and the relationships between biomass allocation and age of Acanthopanax senticosus population in three different habitats of coniferous and broad-leaved mixed forest,Quercus mongolica forest,and secondary miscellaneous forest.The results showed that the individual growth and modules' biomass accumulation of A.senticosus population were closely related to habitat conditions.The mean values of all functional modules' biomass under different ecological environments exhibited the same regularity,i.e.,stem modules>rhizome modules >leaf modules,and there were some similarities in the whole population of A.senticosus.The individual and each module's biomass of the population differed with the canopy density of forests,being larger in Q. mongolica forest with 40% of canopy density than in coniferous and broad-leaved mixed forest and secondary miscellaneous forest.The variations of ramet biomass allocation under different habit conditions indicated the important strategies in growth regulation and biomass allocation,i.e.,more biomass was allocated to the leaves preferentially on small ramets,especially in the secondary miscellaneous forest with biggest canopy density,to ensure the full material product.There was the same regulation of heterogeneous speed growth in the relative weight increase of the leaves,stems and ramets of the population under the three habitat conditions.