松嫩平原栽培条件下羊草无性系构件的结构

羊草是长根茎型禾草，是典型的无性系植物，在松嫩平原的生长季末期，栽培条件下羊草无性系分株由分蘖株和分蘖苗组成，在具有充分生长空间而又没有种间竞争的风沙土上，羊草分株的分蘖节在一个生长季内可以繁殖4个世代，按分蘖节的繁殖世代划分龄级，现实与潜在无性系构件的年龄谱均以1龄级比重最大，随着龄级的增加明显减少，呈增长型的年龄结构，羊草无性系分株的生产力主要与分株形成及生长的时间长短有关，形成时间越早、生长时间越长的分蘖株对无性系的物质生产和营养繁殖的贡献越大，羊草无性系在空间扩展与物质贮存上具有一定的可调节性。

Module structure of Leymus chinensis clones under cultivated condition in Songnen Plains of China

Leymus chinensis is a perennial rhizome grass, a species of typical clonal plant. In the Songnen Plains of China, the ramets of the clone consist of tillers and seedlings under cultivated condition during the last stage of growing season. The tillering nodes of the ramets could propagate four generations, with enough growing space and no interspecies competition in the sandy soil habitats during a growing season. According to the vegetative reproductive generations of tillering nodes, the age spectrum was the largest on the modules of the first age classes for present or potential clones, which reduced obviously with increasing age classes, and they were all expanding type on the age structure. The productivity of every ramet module correlated largely with the time length for growing and the formation of the ramets. The earlier formation time and the longer growing time, the greater the tillers contributed to material production and vegetative reproduction of the clone. There was a certain capability of adjustment for the spatial expansion and the material storage of the test clones.