松嫩平原野大麦种群可塑性生长及密度调节

松嫩平原野大麦种群数量特征的野外调查和统计分析结果表明:在籽实乳熟～成熟期,野大麦种群尚未达到环境最大容纳量,其生物量随种群密度增加呈极显著增长;营养蘖可塑性大于生殖蘖,生殖蘖生产力约是营养蘖的1.3倍;种群抽穗率有较大的变异度;分蘖株的生长已经受到种群密度的调节,分蘖株单蘖重与种群密度和营养蘖密度,以及营养蘖、生殖蘖单蘖重与种群密度间均为幂函数关系.

Analysis of the Plasticity of Growth and Density-Dependent Regulation of Hordeum Brevisubulatum Population of the Songnen Plan

An analysis of the quantitative character of Hordeum brevisubulatum, based on field investigations and compiled statistics in the Songnen Plain where the plant grows,shows that when the seed is at its ripening stage,the population is yet to reach its maximum density allowed by the environment.The biomass of the population increases with its great density growth.Both the vegetative tillers (TV) and the reproductive tillers (RT) reveal high plastictity of quantitative character.The vegetative tillers display greater plasticity than the reproductive tillers,while the yield capacity of the latter(RT) is 1.3 times of that of the former(VT).Populations of the H.brevisubulatum varieties differ in their rate of heading.Tiller growth is generally regulated by the density of the pupulations of the different varieties.The average weight per tiller,per vegetative tiller and per reproductive tiller,are density dependent as a power function.