松嫩平原蒙古蒿种群无性系分株的生长与生物量分配规律

The regulation of growth and biomass allocation on clonal ramets of Artmisia mongolica population on the Songnen plain in China

蒙古蒿为根茎型多年生草本无性系植物。在开花期以后,蒙古蒿无性系种群由生殖分株和营养分株组成。研究的结果表明,在松嫩平原8月中旬,生殖分株的生长速率和生产力以2龄级明显高于1龄级,营养分株则1龄级略高于2龄级。生殖分株和营养分株的生物量分配谱在2个龄级间均大体相同。生殖分株和营养分株在增高和增重,以及叶和茎花组分的增重均具有稳定的异速生长规律。蒙古蒿种群无性系分株的分配策略是,较小分株将分配较多的能量和物质用于生产器官叶的建成,而较大的分株则分配较少的能量和物质用于生产器官叶的建成。

Artemisia mongolica, which is a species of Compositea, is a perennial, clonal herbaceous plant. Its population was constructed by the reproductive ramets and vegetative ramets after the flowering period. The results showed that the growth rate and productivity of reproductive ramets in the 2nd age class were obviously higher than those in the 1st age class, but the vegetative ramets in the 1st age class were slightly higher than those in the 2nd age class in the middle ten days of August on the Songnen Plain. The reproductive ramets or the vegetative ramets had the approximate same spectrum of biomass allocation in the two age classes. Both the reproductive ramets and vegetative ramets had a stable regulation of the heterogeneous speed growth in height, increase in weight and in the accumulation of biomass of leaves, stems and flowers. The allocation strategy on the clonal population of Artmisia mongolica was that the smaller ramets contributed more energy and nutrients to the construction of the leaves, but the bigger ramets contributed less energy and nutrients to the construction of the leaves.