Gray analysis on responses of desert/grassland biome transition zone to global warming-A case of the desert/grassland biome transition zone in New Mexico

Abstract

Abstract: Ecosystems on the earth exhited different responses to global warming.Biome transition zones or ecotones are considered to be particularly sensitive areas to climate changes.Sevilleta desert/grassland biome transition zone in New Mexico,USA is an important region for testing species' responses to changing environmental conditions.In this paper,changes of density,pattern and change trend of the two dominant plants,Bouteloua eriopoda and B.gracilis,in Sevilleta ecotone were studied with gray analysis method.The results showed that the density of Bouteloua eriopoda coming from deserts increased and that of B.gracilis from grassland decreased from 1989 to 1998,with the ratio between the density of B.eriopoda and that of B.gracilis over 1,and still increasing.The maximum temperature was the key factor among precipitation,temperature and humidity which contributed to the changes.The trend that the desert species B.eriopoda would strongly dominate in the mixed community indicated that Sevilleta ecotone would probably be replaced by desert grassland with global warming continuing.

Key words: Regional agro-ecosystem, Environmental quality, Assessment

CLC Number:

X171.1

LIU Qinpu, LIN Zhenshan. Gray analysis on responses of desert/grassland biome transition zone to global warming-A case of the desert/grassland biome transition zone in New Mexico[J]. cje, 2005, (7): 756-762.

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