快速城市化背景下景观生态安全时空动态分析——以南昌市区为例

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

以南昌市区2000年、2004年和2009年景观格局数据为基础,从景观结构和景观功能两方面构建景观生态安全评价指标体系,对3个时期的景观生态安全进行评价,并借助空间自相关方法对景观生态安全的时空动态演变特征进行分析,揭示快速城市化背景下景观生态安全的变化规律.结果表明:(1)2000年~2009年间,南昌市区的景观结构安全性逐渐降低,生态系统服务价值不断减少,生态弹性度明显降低,景观生态安全整体程度逐渐下降;(2)高、较高生态安全小区不断向中、低生态安全小区转化,景观生态安全状况不断恶化;(3)景观生态安全在空间上存在显著的正相关关系,高生态安全区主要聚集在人类活动干扰相对较少的西北部湾里区,面积不断减小;中生态安全区位于中南部的东西湖区和青云谱区,随着城市建成区快速扩张,范围不断扩大;低生态安全区聚集于中部、东南部青山湖区的城市扩张边缘带,面积逐渐增加.

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.