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The influence of fire frequency on the abundance of maerua subcordata in the Serengeti National Park, Tanzania

Journal of Plant Ecology 2012年第4期5卷 400-406页

作者： Ayron M.Strauch Stephanie Eby Department of Biology Tufts University163 Packard AvenueMedfordMA 02155USA Department of Ecology and Evolutionary Biology 106A Guyot HallPrinceton UniversityPrincetonNJ 08544USA Present address:Department of Ecology and Evolutionary Biology Yale UniversityPO Box 208106165 Prospect StreetNew HavenCT 06520-8106USA

Aims Invasive species alter the composition and function of communities,threatening the conservation of important ecosystems *** savanna ecosystems,fire plays a key role by modifying biogeochemical cycles and shaping the composition and structure of vegetation *** many studies have examined the long-term effects of fire frequency on grassland communities,few studies have examined the relationship between fire regime and woody species *** The Serengeti ecosystem is an ecologically and economically valuable natural resource in East Africa whose conservation is currently threatened by a variety of factors,including invasive *** determined the abundance of maerua subcordata,a noxious woody shrub,in three different regions of the Serengeti National Park,*** then examined the influence of fire frequency,developed through the use of 7 years of Moderate Resolution Imaging Spectroradiometer(MODIS)imagery,on *** *** Findings In all regions,burned transects had significantly greater abundances of *** compared to unburned ***,the number of times each transect burned from 2000 to 2006 had a significant positive effect on the abundance of *** and the number of years since a transect last burned had a significant negative relationship with *** results are particularly important as this species provides little forage value and is potentially toxic to wildlife and *** studies are needed to determine the ecological consequences of increasing *** abundance,as the potential expansion of noxious shrubs into protected areas of important conservation status is of serious concern.

关键词： Serengeti fire savanna maerua subcordata MODIS

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