中文摘要：

针对公路边坡植被恢复过程中,实生苗灌木在草灌混播群落中生长困难的问题,应用生态学实验方法,以灌木柠条为代表进行了草本-灌木混播竞争关系研究.结果表明：草本植物播种密度对灌木生长的影响主要是草本覆盖度形成速率与灌木生长速率之间的竞争;草本植物密度≤250株/m2时,灌木生长最好;草本植物对灌木高生长抑制作用最大的时间是播种后40 d左右,对灌木数目影响最大的时间是播种后6075 d;草本植物对灌木竞争作用的表现是,初期导致灌木各项生长参数降低,后期导致灌木存活数目下降.

英文摘要：

Competition of grass-shrub mixed planting community,especially Caragana microphylla,was determined by ecological methods in vegetation restoration of highway side,although it is difficult to determine growth of seeding shrubs in grass-shrub planting community.Results showed that effects of herb planting density on shrub growth were mainly competition between rates of herb coverage and shrub growth.Shrubs growed well when density of herb≤ 250 ind/m2.After 40 d of seeding,maximal inhibition of herb to shrub growth was turned out.However,after 6070 d of seeding,effects on shrub number were maximal.In initial stage,competition between herb and shrub result in reduction of all growth index of shrub,whereas in later stage,result in reduction of surviving number of shrub.