Spatial-temporal dynamic analysis of landscape ecological security in the context of rapid urbanization——a case study of Nanchang City proper

Based on the landscape pattern data in year 2000,2004 and 2009respectively,this paper aims to assess the landscape ecological security of a rapid urbanizing areaNanchang city proper.The index system of landscape ecological security is built on the landscape structure and landscape function.Then spatial autocorrelation methods are employed to analyze the characteristics of the spatial pattern.The results indicate that:(1)from 2000 to 2009,landscape structure security,ecosystem service value and ecological resilience have gradually decreased,and the degree of overall landscape ecological security has largely reduced.(2)Higher and high ecological security units continually transform into medium and low ecological security units,the state of landscape ecological security continues to deteriorate.(3)There is a significant correlation on the spatial pattern of landscape ecological security.Higher ecological security units aggregate in the northwestern Wanli district,and the areas of higher ecological security units have continuously decreased.Medium ecological security units distribute in south-central Donghu,Xihu and Qingyunpu district.With the expansion of urban built-up areas,and the scopes of medium ecological security units have increased.Low ecological security units aggregate on central and southeastern urban fringe of Qingshanhu district,and the areas have gradually increased.