荒漠植物红砂(Reaumuria soongorica)的保育效应及其对群落物种多样性的影响  

Influence of nurse effect on the diversity of desert Reaumuria soongoricacommunity under arid environment in the Loess Plateau

作　　者：刘秉儒[1] 李文金[2] 

机构地区：[1]宁夏大学西北退化生态系统恢复与重建教育部重点实验室,银川750021 [2]兰州大学干旱与草地生态教育部重点实验室,兰州730000

出　　处：《干旱区资源与环境》2012年第10期117-120,共4页Journal of Arid Land Resources and Environment

基　　金：国家科技支撑计划项目(2011CB426303);国家自然科学基金(41061003);宁夏自然科学基金(编号:NZ1005)资助

摘　　要：红砂(Reaumuria soongorica)是我国北方温带荒漠的主要先锋植物,也是一种潜力巨大的水土保持和荒山绿化物种,但是该乡土物种是否具有保育植物的特征,目前尚未有这方面的研究。文中通过研究生长于半干旱区的荒漠植物红砂群落不同分布格局和群落特征,分析红砂盖度变化对群落多样性的影响,探究保育效应的发生条件及其对群落物种多样性影响机理。研究结果表明:群落的植物物种多样性随着红砂植被盖度和地上生物量增大而逐渐增大,然而,当红砂总盖度超过48.73%(地上生物量为35.62g/m2)时,虽植被盖度和地上生物量继续增大,目标物种碱蓬(Suaeda glauca),蓍状亚菊(Ajania achilleoides)多度明显增加,但植物物种多样性并没有显著的变化。这些说明在干旱区,当红砂的盖度增加到一定程度之后,才能通过冠层遮阴产生保育效应。因此,在植被稀疏、物种多样性较低的干旱地区,可以充分利用红砂物种的保育效应,促进和加快植被自然恢复进程,调控物种多样性和群落结构。The desert plant Reaumuria soongorica is one of the peer plants in warm desert zone of northern China,which is excellent native species,but whether the plant possesses the nurse function is not well known.In this paper,R.soongorica community structure characteristic and distribution pattern were investigated,and influence of nurse effect on plant diversity were analyzed.In order to explore nursing effect mechanisms,and provide scientific basis for arid zone vegetation restoration,five gradient levels of plant cover of R.soongorica at arid zone of Gansu were studied.The results showed plant species diversity increases with the plant cover age and aboveground biomass of R.soongorica increase,and tends to be the highest when the biomass is to be 35.62g/m2（total cover 48.73%）.Richness of target specieses of Suaeda glauca and Ajania achilleoides increase with the plant cover age and aboveground biomass increase,but plant species diversity has no obvious change.These results implied that nurse function of R.soongorica only displays while the plant coverage get to a certain extent.Thus we may utilize nurse effect to facilitate or accelerate success process,and controll the species diversity and community structure in arid areas with sparse vegetation and lower plant diversity.

关 键 词：保育植物 红砂群落 物种多样性 植被恢复 保育效应 

分 类 号：Q16[生物学—普通生物学]