松嫩平原不同生境寸草苔种群生殖分株的数量特征及生殖分配动态

通过对松嫩平原割草地的割草地段和休闲地段的单优势种群落和混生群落,以及多年休闲封育地段火烧处理的单优势种群落和混生群落计3种生境6个群落的取样测定,研究了寸草苔种群生殖分株在开花期和籽实成熟期的数量特征和生殖分配的时空动态.从开花期和籽实成熟期,寸草苔生殖分株高与分株生物量变化幅度具一致性,分别平均增长了211%和207%;穗长平均增长了9%,但穗生物量则增加了152%.生殖分配在开花期空间变异性较小,籽实成熟期增大.寸草苔种群生殖分株的生殖分配与分株高和分株生物量之间的关系,多数种群是在开花期以后形成并逐渐趋于稳定的线性变化规律.

Quantitative characters and reproductive allocation dynamics on reproductive ramets of Carex duriuscula populations in different habitats in the Songnen Plains of China

Through sampling measure on 6 communities in 3 habitats which are the single dominant species community and mixed species community on the mowing plot, rest plot in mowing range and fired plot in perennial rest reserved range in the Songnen Plains of China, the quantitative characters and space-time dynamics of reproductive allocation on reproductive ramets of Carex duriuscula populations was researched in the flowering stage and the ripening stage. From the flowering stage to the ripening stage, the change ranges were the consistency on the height and biomass of the reproductive ramets, which increased the average of 211% and 207% respectively; the length of spikes increased the average of 9%, but the biomass of spikes increased 152%. The space variability on reproductive allocation was low in the flowering stage and increased in the ripening stage in different plots. The relationships,between reproductive allocation and the height and biomass of reproductive ramets,formed which is linear and tended to be stable gradually in most of populations after flowering stage.