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Explaining patterns of species dominance in the shrub steppe systems of the Junggar Basin(China) and Great Basin(USA)

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Journal of Arid Land 2013年第4期5卷 415-427页

作者： Wendy TROWBRIDGE Thomas ALBRIGHT Scot FERGUSON Jun LI barry perryman Robert S NOWAK Department of Natural Resources & Environmental Science University of Nevada RenoReno NV 89557USA Department of Geography University of Nevada RenoReno NV 89557USA Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Department of Agriculture Nutrition and Veterinary Sciences1664 N Virginia StreetMail Stop 202University of Nevada RenoReno NV 89557USA

Natural scientists have long recognized that regions with similar climate tend to have similar *** observations suggest that shrub steppe communities of the western US and western China may be two such regions with similar annual precipitation,temperature,land use,and *** cold dry shrub steppes have traditionally been *** these similarities,patterns of species dominance are *** species that are rare in China become dominant when introduced to the United *** objective of this study was to investigate how climate,land use and community structure may explain these patterns of species *** structure and grazing intensity were measured at 5 sites in each *** information was combined with a broader review of the literature describing the history of grazing in both *** was analyzed based on a spatially-gridded,interpolated weather time series （monthly records） and climatological summary （1961-1990 mean conditions） data set from the Climate Research *** found that differences in summer precipitation and winter minimum temperature,land use intensity,and shrub size may all contribute to the dominance of annual species in the Great Basin,particularly Bromus *** particular,previous work indicates that summer precipitation and winter temperature drive the distribution of Bromus tectorum in the Great *** a result,sites with wet summers and cold springs,similar to the Chinese sites,would not be expected to be dominated by Bromus tectorum.A history of more intense grazing of the Chinese sites,as described in the literature,also is likely to decrease fire frequency,and decreases litter and shrub dominance,all of which have been demonstrated to be important in Bromus tectorum establishment and ultimate *** research is necessary to determine if other annuals that follow the same pattern of scarcity in the Junggar Basin and dominance in the Great Basin are res

关键词： climate community ecology convergent evolution Bromus tectorum shrub steppe Junggar Basin Great Basin

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