木岩黄芪的繁殖特点及其与沙生适应性的关系

 木岩黄芪具有两种繁殖方式：天然下种繁殖及根状茎繁殖。本文试图从这两种繁殖方式入手，探讨木岩黄芪的沙生适应性。木岩黄芪种子繁殖效率较低，原因主要有两点：种子不易传播和影响天然下种繁殖的因素较多。大致3年生的实生植株具备根状茎繁殖能力，根状茎繁殖对战胜沙埋具有较大的作用，也具有在干旱条件下保证该植物萌发新枝从而衰而不竭的作用，这无疑是适应沙地流动性及干旱性的重要生物学特性。

RELATIONSHIP BETWEEN RECENERATION CHARACTERISTICS AND ARENACEOUS ADAPTABILITY OF HEDYSARUM FRUTICOSUM VAR.LIGNOSUM

The relationship between regeneration characteristics and arenaceous adapta- bility of Hedysarum fruticosum vat.lignosum was analysed.The results showed that there were two regenerating mechanisms for H.fruticosum var.lignosum: natural seed regeneration and natural regeneration by rhizomes,the former of wh- ich is less successful because the seeds are difficult to spread and there are a lot of factors affecting seed germination;and the latter is the main way of re- generation.Three-year-old seedlings begin to reproduce by rhizomes,which is of significant for the plant to overcome sand-burying and to guarantee its bran- ch-shooting and existence,and which is undoubtedly one of biological proper- ties of adaptability to mobility and aridity of sand dunes.