不同扰动条件下的羊草种群生物量年龄结构  

Biomass age structure of Leymus chinensis populations under different disturbance conditions

作　　者：田迅[1] 杨允菲[1] 

机构地区：[1]东北师范大学草地研究所植被生态科学教育部重点实验室,吉林长春130024

出　　处：《草业学报》2003年第5期50-54,共5页Acta Prataculturae Sinica

基　　金：国家自然科学基金(No.30070137;No.39770536)资助。

摘　　要：对西辽河平原天然草地不同干扰条件下羊草种群的生物量结构进行了调查与分析。结果表明,干扰强度小的生境羊草种群分蘖株由4个龄级组成,其生物量为稳定型年龄结构;干扰强度大的生境有3个龄级,为增长型年龄结构。种群年龄结构随干扰强度的增大由稳定型的转向增长型。不同干扰生境根茎生物量均有4个龄级,均呈稳定型年龄结构,并在干扰强度较大条件下高龄级根茎生物量已明显减少。羊草种群在不同的干扰条件下生物量分配策略有明显的差异。Leymus chinensis is a perennial rhizome grass with vigorous vegetative propagation. On the Xiliao River plains, a field investigation of the natural grassland under different disturbance conditions was carried out looking at the biomass structure of L.chinensis populations. Populations in habitats with light disturbance had four age classes of tillers with a stable biomass age structure. In heavy disturbance habitats there were three age classes with an expanding age structure. Increasing disturbance resulted in stable age structures changing to expanding age structures. At varying levels of disturbance the rhizome biomass had four age classes, and showed a stable age structure. Biomass of high age rhizomes had already reduced significantly in habitats with heavy disturbance. L.chinensis populations showed obvious differences in biomass allotment strategy between different disturbance conditions.

关 键 词：羊草 种群 分蘖株 根茎 生物量 年龄结构 

分 类 号：Q948[生物学—植物学]