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Resource availability and plant diversity explain patterns of invasion of an exotic grass

Journal of Plant Ecology 2013年第2期6卷 141-149页

作者： Sara Kuebbing Mariano A.Rodriguez-Cabal David Fowler Lauren Breza Jennifer A.Schweitzer Joseph K.Bailey Department of Ecology and Evolutionary Biology University of Tennessee569 Dabney HallKnoxvilleTN 37996USA

Aims in this study,we examine two common invasion biology hypotheses-biotic resistance and fluctuating resource availability-to explain the patterns of invasion of an invasive grass,Microstegium *** We used 13-year-old deer exclosures in great smoky mountains National Park,USA,to examine how chronic disturbance by deer browsing affects available resources,plant diversity,and invasion in an understory plant *** two replicate 1 m2 plots in each deer browsed and unbrowsed area,we recorded each plant species present,the abundance per species,and the fractional per-cent cover of vegetation by the cover classes:herbaceous,woody,and *** each sample plot,we also estimated overstory canopy cover,soil moisture,total soil carbon and nitrogen,and soil pH as a measure of abiotic differences between *** Findings We found that plant community composition between chronically browsed and unbrowsed plots differed *** diversity was 40%lower in browsed than in unbrowsed *** our sites,diver-sity explained 48%and woody plant cover 35%of the variation in *** *** addition,we found 3.3 times less *** in the unbrowsed plots due to higher woody plant cover and plant diversity than in the browsed plots.a parsimonious explanation of these results indicate that disturbances such as herbivory may elicit multiple conditions,namely releasing available resources such as open space,light,and decreasing plant diversity,which may facilitate the proliferation of an invasive ***,by testing two different hypotheses,this study addresses more recent calls to incorporate multiple hypotheses into research attempting to explain plant invasion.

关键词： Microstegium vimineum biotic resistance hypothesis fluctuating resource availability hypothesis deer herbivory ungulate exclosure

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