title: [Age structure of tillers of Hordeum brevisulatum clone in Songnen plain of China].
abstract: The tillers of Hordeum brevisulatum clone have a significantly expanding age structure, which includes three age classes. The 1st age class tillers are absolutely dominant in the reproductive growth of the clone. The older the tillers, the smaller the rate of quantitative increase, and the less the accumulative nutrients are. The quantity and biomass of the 1st and 2nd age classes increase with the size and the tiller number of the clone, while the 3rd age class tillers are positively linearly interrelated to the total tillers of the clone. The mean weight per tiller decreases with the age class increased. The mean weight per reproductive tiller is relatively constant among three age classes, and that of the 1st tillers of clone has a negative respondence to the density of tiller. The age structure of the potential population of clone is also of an obviously expanding type. The buds on the vegetative tillers are always more than those on the reproductive tillers. The buds on the vegetative or reproductive tillers of every age class are all positively interrelated to the size and the total tillers of clone.
authors.affiliation: National Laboratory of Grassland Ecological Engineering, Northeast Normal University, Changchun 130024.
authors.forename: H
authors.initials: H
authors.lastname: Li
authors.forename: Y
authors.initials: Y
authors.lastname: Yang
authors.forename: X
authors.initials: X
authors.lastname: Qiao
mesh_terms: D018533:Biomass; D002681:China; D001467:Hordeum / Q000254:growth & development* / Q000502:physiology; D012098:Reproduction / Q000502:physiology; D013997:Time Factors