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Community phyl.genetic diversity and abiotic site characteristics infl.ence abundance of the invasive pl.nt rhamnus cathartica l.

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Journal.of Pl.nt Ecol.gy 2014年第2期7卷 202-209页

作者： Timothy J.S.Whitfel. Al.xandra G.l.dge Al.xander M.roth Peter B.reich Department of Forest resources University of Minnesota1530 Cleveland Avenue NorthSt PaulMN 55108-6112USA Hawkesbury Institute for the Environment University of Western SydneyPenrithNSW 2751Australia

Aims Theory predicts that the success of introduced species is rel.ted to the diversity of native species through trait-based *** site characteristics may al.o affect a site’s susceptibil.ty to *** quantified resident pl.nt species richness,phyl.genetic diversity and several.abiotic site characteristics for 24 oak forests in Minnesota,USA,to assess their impact on the abundance of a widespread,introduced terrestrial.pl.nt species,common buckthorn(rhamnus cathartica l.).Specifical.y,we asked(1)whether resident species richness and phyl.genetic diversity affected the abundance of *** and(2)what site characteristics expl.ined the overal. abundance of *** Our survey incl.ded 24 oak-dominated stands in Minnesota’s deciduous *** each stand,we identified al. species in 16 *** al.o measured a series of environmental.site characteristics,incl.ding canopy openness(a proxy for l.ght avail.bil.ty),percent bare soil.soil.pH,percent sand,an index of propagul. avail.bil.ty,duff l.yer thickness(a proxy for earthworm activity),an index of insol.tion and *** al. species present in at l.ast one site,we estimated a community *** combined al. sitel.vel.characteristics,incl.ding phyl.genetic diversity of the resident pl.nt species,in a mul.ipl. regression model.to examine site-l.vel.drivers of community *** Findings resul.s indicate that sites with higher overal. pl.nt phyl.genetic diversity harbor l.ss ***,even though native species richness was not significantl. rel.ted to *** *** anal.ses indicated that,in addition to resident species phyl.genetic diversity,the most important predictors of *** abundance were canopy openness and the amount of bare soil.both positivel. rel.ted to the abundance of the *** combining the effects of abiotic site characteristics and resident species phyl.genetic diversity in a model.that predicted the abundance of r

关键词： invasibil.ty r.cathartica l. phyl.genetic diversity site characteristics

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