title: [Age structures of Spodiopogon sibiricus populations on weedy meadow and elm woodland in Songnen Plain, northeast China].
abstract: In 2003 and 2006, investigations were made on the age structures of Spodiopogon sibiricus populations as well as the matter productivities and vegetative reproduction capacities of different age-class modules of the populations on the weedy meadow and elm woodland in Songnen Plain of northeast China. At the two habitats, the tillers of S. sibiricus all consisted of 2-3 age classes, and the rhizomes all composed of 4 age classes. Both the tillers and the rhizomes had the greatest proportion of 1- or 2-year-old, and the age structures were of expansive or stable. The 1- or 2-year-old tiller-node buds were dominant, and the rhizome topmost buds occupied 29.4%-45.0%, being of significance to the population regeneration in the next year. The 1- or 2-year-old modules of the tillers and rhizomes had the highest matter productivity and vegetative reproduction capacity, and the rhizomes had higher vegetative reproduction capacity than the tiller-nodes.
authors.affiliation: Ministry of Education Key Laboratory of Vegetation Ecology, Institute of Grassland Science, Northeast Normal University, Chang-chun 130024, China. lihy697@nenu.edu.cn
authors.forename: Hai-yan
authors.initials: HY
authors.lastname: Li
authors.forename: Yun-fei
authors.initials: YF
authors.lastname: Yang
mesh_terms: D002681:China; D017753:Ecosystem; D006109:Poaceae / Q000145:classification / Q000254:growth & development*; D011157:Population Dynamics; D013997:Time Factors; D034403:Ulmus / Q000254:growth & development*