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Niche Changes Analysis of the City Niche Based on the Niche Theory

ZUO Zhi-li et al(College of Resource and Environment Science,Guangxi Teachers Education University,Nanning,Guangxi 530001)  
Niche theory as a basic theory in ecology was widely introduced into the research of the social-economical area.The evaluation index system of city niche of Nanning was constructed from three aspects of the economical development,social development and natural ecological environment of urban ecosystem.Using principal components analytic method,the rules of niche pattern change of different systems in the city of Nanning were discussed in recent seven years.And the reason for its changes was analyzed.The results showed that the niche of Nanning City had the tendency of rise as wave in total from 2001 to 2007.While the environmental niche had declined,but the change was relatively flat from 2004;Social niche had been rising in other years except 2005;The economical niche kept continually trend of escalation.
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