松嫩平原天然肥披碱草种群生殖器官的数量性状分析

Quantitative characters of reproductive organs of natural Elymus excelsus population in Songnen Plains of China

通过对混生群落肥披碱草大样本随机取样的调查与测定,定量分析了松嫩平原天然肥披碱草种群生殖器官的数量性状。统计结果表明,肥披碱草种群的穗状花序长为(15.55±2.13)cm,其生物量为(0.691 6±0.206 9)g/穗,子粒生物量为(0.527 5±0.164 1)g/穗,具有(26.63±3.35)个小穗/穗,(124.67±34.41)个小花/穗,(112.57±30.16)个子粒/穗,结实率为90.84%±6.23%。肥披碱草生殖器官各数量性状之间存在明显的变化规律,其中,小穗数/穗、小花数/穗、子粒数/穗随着穗长的增加均呈幂函数异速生长;生物量/穗随着穗长,子粒生物量/穗随着生物量/穗和小花数/穗的增加均呈线性同速生长。

Through the investigation and measurement of large random samples on spikes,quantitative characters of reproductive organs of natural Elymus excelsus population in the mixed community in Songnen Plains of China were studied. The length and biomass of the spikes were （15.55±2. 13） cm and （0. 691 6±0. 206 9） g, and the biomass of grains per spike was （0. 527 5±0. 1641） g. The number of spikelets,florets and grains per spike were 26.63±3.35,124.67±34.41 and 112.57±30. 16 respectively. The setting percentage was （90. 84± 6.23）%. There were obvious regulations among the quantitative characters of reproductive organs of Elyrnus excelsus population. Furthermore,the number of spikelets,florets and grains per spike rapidly rose with the in- crease of length of spikes and this showed the allometry regulation of power function. And the biomass per spike increased with its length,the biomass of grains per spike increased with the number of florets and the biomass per spike,all of these increasing patterns showed the isogony regulation of linear function.