Abstract: Bothriochloa ischaemum is a perennial gramineous species.In a Shanxi rangeland during the Bothriochloa ischaemum seed ripening stage,the reproductive tillers of the grass populations were widely sampled,branched into 10 tiller-height classes,and tested.Results show that the height of the tillers boasted not only a significant positive linear correlation with the length of the spikes,but also with the weight of thousand seeds,the vegetative-organ biomass,the reproductive-organ biomass,and the total biomass.The reproductive tillers height had also a significant negative linear correlation with the ratio of reproductive growth,the ratio of anthotaxy allocation,seed forming and seed allocation.The regular quantitative change of the tillers accompanies the adaptability of an individual plant in its growth and reproduction to a given habitat.

Key words: Bothriochloa ischaemum populations, Reproductive tiller, Quantitative characters

摘要： 在天然白羊草(Bothrioch loaischaemum(L.)K eng)种群籽实成熟期间,采集生殖分蘖株,按10个高度级进行测定。结果表明:白羊草种群生殖分蘖株的株高与花序长度、籽粒千粒重、营养生物量、生殖生物量和总生物量之间呈显著正相关,与生殖生长比率、结实率、花序分配和种子分配呈显著负相关;生殖分蘖株数量特征的规律性变化,表现出特定生境条件下个体生长与生殖的适应性。

关键词: 白羊草种群, 生殖分蘖株, 数量特征