Arbuscular mycorrhizal impacts on competitive interactions between Acacia etbaica and Boswellia papyrifera seedlings under drought stress  

作　　者：Emiru Birhane Frank J.Sterck Frans Bongers Thomas W.Kuyper 

机构地区：[1]Forest Ecology and Forest Management Group,Wageningen University,PO Box 47,6700 AA,Wageningen,The Netherlands [2]Land Resources Management and Environmental Protection,Mekelle University,PO Box 231,Mekelle,Ethiopia [3]Department of Soil Quality,Wageningen University,PO Box 47,6700 AA Wageningen,The Netherlands

出　　处：《Journal of Plant Ecology》2014年第3期298-308,共11页植物生态学报（英文版）

基　　金：Netherlands Fellowship Programme(NUFFIC)and NWOWOTRO(Netherlands Organization for Scientific Research-Science for Global Development)through the integrated program FRAME(Frankincense,myrrh and gum arabic:sustainable use of dry woodlands resources in Ethiopia,grant number W01.65.220.00);Mekelle University,Wageningen University,research grants from NORAD II project and IFS(International Foundation for Science,grant number D-4362-1)to E.B.

摘　　要：Aims Arbuscular mycorrhizal fungi can have a substantial effect on the water and nutrient uptake by plants and the competition between plants in harsh environments where resource availability comes in pulses.In this study we focus on interspecific competition between Acaia etbaica and Boswellia papyrifera that have distinctive resource acquisition strategies.We compared the extent of interspecific competition with that of intraspecific competition.Methods In a greenhouse study we examined the influence of Arbuscular Mycorrhiza(AM)and pulsed water availability on competitive interactions between seedlings of the rapidly growing species A.etbaica and the slowly growing species B.papyrifera.A factorial experimental design was used.The factors were AM,two water levels and five species combinations Important Findings Seedlings of both species benefitted from AM when grown alone,and the positive growth response to pulsed water availability in B.papyrifera seedlings was in contrast with the negative growth response for A.etbaica seedlings.AM also affected the competitive performance of both species.B.papyrifera was not affected by intraspecific competition,whereas A.etbaica was negatively affected compared to the seedlings grown alone.This effect was stronger in the presence of AM.In interspecific competition,A.etbaica outcompeted B.papyrifera.Mycorrhiza and pulsed water availability did not affect the outcome of interspecific competition,and the aggressivity index of A.etbaica remained unchanged.The extent to which AM influences plant competition in a droughtstressed environment may depend on belowground functional traits of the species.AM and pulsed water availability could modify the balance between intraspecific and interspecific competition.By affecting the balance between intraspecific and interspecific competition,both factors could impact the establishment and survival of seedlings.

关 键 词：COMPETITION relative yield CONSERVATIVE acquisitive functional traits 

分 类 号：Q94[生物学—植物学]