蒙古沙冬青AM真菌物种多样性空间异质性  

Diversity and spatial heterogenicity of arbuscular mycorrhizal fungi under Ammopiptanthus monglicus

作　　者：王晓乾[1] 贺学礼[1] 程春泉[1] 陈严严[1] 姜桥[1] 

机构地区：[1]河北大学生命科学学院,河北保定071002

出　　处：《河北大学学报（自然科学版）》2014年第6期643-649,共7页Journal of Hebei University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(31170488)

摘　　要：2013年7月在内蒙古阿拉善、磴口、乌拉特后旗和乌海4个样地采集蒙古沙冬青(Ammopiptanthus monglicus)根围土壤样品,研究了不同样地AM真菌群落组成和物种多样性空间分布规律.共分离鉴定AM真菌5属25种,其中,球囊霉属12种,无梗囊霉属8种,是4样地优势属;管柄囊霉属和盾巨孢囊霉属是4样地亚优势属,内养囊霉属1种,仅在磴口和阿拉善出现.4样地共有种包括粘质球囊霉、黑球囊霉、网状球囊霉、凹坑无梗囊霉、细凹无梗囊霉、光壁无梗囊霉和黑色盾巨孢囊霉.黑球囊霉是4样地共同优势种.不同样地孢子密度、种丰度、香农指数、辛普森指数和均匀度总体变异趋势是乌拉特后旗≈阿拉善>磴口>乌海.乌海样地AM真菌组成与其他样地差异显著.结果表明,AM真菌群落组成随蒙古沙冬青地理分布变化而产生空间演替,这为进一步研究蒙古沙冬青与AM真菌共生关系及其生态分布规律提供了依据.To understand the species diversity and spatial heterogenicity of AM fungi associated with Ammopiptanthus monglicus,the author collected soil samples（0-50cm）under A.monglicus from four different sites,such as Dengkou,Wu′late After Banner,Alxa and Wuhai in Inner Mongolia in July 2013.A total of 25 AM fungal species belonging to five genera were isolated in four sampling sites.Among them,12 belonged to Glomus,eight belonged to Acaulospora,three belonged to Funneliformis,one belonged to Scutellosporaand one belonged to Entrophospora.Glomus and Acaulospora were the dominant genera and Funneliformis and Scutellospora were subdominant genera at the different sites.Entrophosporaonly in Dengkou and Alxa.G.viscosum,G.melanosporum,G.reticulatum,A.excavate,A.scrobiculata,A.laevis and Scu.nigra were common species,and G.melanosporum was the dominant species at the different sites.Generally,spore density,species richness,evenness,Shannon diversity and Simpson diversity indices showed the following trend across sites,i.e.Wu′late After Banner≈AlxaDengkouWuhai.Species diversity in Wuhai was significantly lower than that at the other sites.The results indicate that AM fungal species diversity changes with the geographical distribution of A.monglicus.

关 键 词：AM真菌 群落组成 物种多样性 空间异质性 

分 类 号：Q948[生物学—植物学]