松嫩平原扁秆藨草种群生殖株构件表型可塑性及生长分析

采用大样本取样野外实地测定方法，对松嫩平原扁秆藨草(Scirpus planiculmis)种群生殖株的数量性状和生殖分配规律进行了分析。结果表明，在籽实成熟期，扁秆藨草种群生殖株各数量性状具有较大的表型可塑性。变异系数以种子生物量最大，为81.63%；其次为种子生殖分配73.14%；株高最小,为13.11%。扁秆藨草种群生殖株表型可塑性遵循着规律性，即随着株高和株生物量的增加，茎叶生物量呈幂函数增加，花序生物量呈直线增加;生殖分配随着株高和株生物量的增加呈幂函数或指数减少。

Phenotype plasticity of modules and growth analysis of reproductive ramets in Scirpus planiculmis population in the Songnen Plain of China

By analysis of large samples obtained in the fields,quantitative characters and regulations of reproductive allocation of reproductive ramets in Scirpus planiculmis population in the Songnen Plain were studied.The results showed that quantitative characters of reproductive ramets in S.planiculmis population had large phenotype plasticity.The coefficient of variation(CV) of seed biomass was the largest(81.63%),while the CVs of reproductive allocation Ⅱ and ramet height were the second higher with 73.14% and the smallest with 13.11%,respectively.The phenotype plasticity of reproductive ramets in S.planiculmis population had a significant regularity.With the increase in ramet height and in biomass,leaf biomass showed a power function increase;a linear increase in inflorescence biomass;and a power function or exponential decrease in reproductive allocation.There were two different regulations of phenotype plasticity of reproductive ramets in S.planiculmis population(isogony and allometry) at the same time.The regularity of growth and reproductive allocation showed that the reproductive ramets of different growth conditions had different allocation strategies for limited resources.