海拔高度对羊草生物量和根茎形态可塑性的影响  

Effect of Different Altitude on Biomass and Rhizomatous Morphological Plasticity of Leymus chinensis

作　　者：国振杰[1] 易津[1] 张力君[1] 陈锋[1] 侯晓东[1] 

机构地区：[1]内蒙古农业大学牧草生理生态研究室,呼和浩特010019

出　　处：《干旱区资源与环境》2008年第4期175-180,共6页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(No.C30260012)资助

摘　　要：内蒙古大青山地区羊草生物量和根茎形态可塑性随海拔高度(1000m-2000m)变化反应的研究结果表明,二者均具有显著可塑性。在生物量方面:羊草生物量、群落总生物量及两者比值随着海拔高度的升高均呈现出递增的趋势;根茎与须根的比值也是呈增加的趋势,这表明海拔高度影响其物质的分配比率,但根冠比却呈二次曲线的变化,即开始时下降随后又增加的趋势。在形态可塑性方面:根茎总长度、根茎节间长度随着海拔的升高,呈现出递增的趋势,而相邻分株间距没有表现出明显海拔差异。Leymus chinensis was sampled in the two routes of different vegetation types at the five different altitudes （ 1000m -2000m） in Daqing Mountain region of Inner Mongolia in order to investigate the effect of altitude on its plasticity. The results showed that the plasticity of Leymus chinensis in biomass and rhizome morphological characteristic were significantly in response to altitude. The biaomass of Leymus chinensis,the total biomass of community, the biomass ratio of Leymus chinensis to community and the biomass ratio of rhizome to pogoniasis root increased with the increase of altitude. This means that altitude can change the biomass allocation. The change patterns of the biomass ratio of root to shoot were in a quadratic curve when the altitude increased, which decreased in the former three altitude,then were on the raise in the following ones. In morphological respect of rhizome , the length of ryizome and average internode were also significantly increased when altitude increased, but there wasn＇t significant difference in ramet distance.

关 键 词：根茎禾草 羊草 海拔 可塑性 

分 类 号：Q948.12[生物学—植物学]