不同群落类型对羊草（Leymus chinensis）种群生殖分配的影响

通过对羊草种群在不同生境条件下干物质和营养元素在植株不同部位的配置研究，结果表明：羊草种群在干物质方面的配置为：根＞茎＝叶＞果实；Ｃ元素在单草植株的各个部位均匀分配，Ｎ元素的配置表现为：叶＞果＞根＝茎；Ｐ元素的配置表现为：果＞叶＞根＝茎，粗灰分表现为：根＝叶＞果＞茎．营养元素的配置在克氏针茅、大针茅、羊草三个群系类型之间，无论是什么部位都无显著差异，而这三个群系类型都与贝加尔针茅类型有显著差异，差异主要表现在茎和叶中．

The Influence of Different Habitat on the Reproductive Allocation of Leymus chinensis Population

The biomes and nutrient elements of Leymus chinensis population under different habitas are studied. And we condsider that the allocation of dry-matter is root>stem=leaf>fruit,the carbon element allocates evenly at different part of the Leymus chinensis plant,the allocation of nitrogen element is feat>fruit>root=stem,and the allocation of phosphorus element is fruit>leaf>root =stem,crude ash content's allocation is root=leaf>fruit>stem. As far as the allocation of nutrient elements is conterned,there is no marked difference among the three communities:Stipa grandis community,Stipa kryiovii community and Leymus chinesis community in all part of the Leymus chinensis plant. But these three communities and Stipa baicalensis community has marked difference,this difference mainly lies in stem and leaf.