江苏省土地生态安全预警演变与空间格局分析

ANALYSIS ON LAND ECOLOGICAL SECURITY WARNING AND SPATIAL PATTERN IN JIANGSU PROVINCE

关键词:  土地生态安全预警评价时空格局江苏省

Key words:  ecological security of land  early warning  spatial and temporal pattern  Jiangsu province

摘要:

［目的］现有研究基本上是针对江苏省某一地区进行分析，并未分析江苏省整体土地生态安全。探索江苏省土地生态安全预警问题及其空间格局变化，目的是缓解江苏省土地利用与生态安全的矛盾。［方法］基于江苏省各指标体系，利用熵权法测算指标权重，并利用土地生态安全预警模型监测2005～2015年江苏省土地生态安全预警程度，并划分预警级别，在此基础上运用GIS技术分析其空间格局变化。［结果］江苏省土地生态安全指数总体上呈波动上升态势，表明近10年来江苏省土地生态环境较为乐观，且效果明显，但2007年和2012年分别出现过两个低潮； 从空间格局来看，江苏省土地生态系统不断完善，预警程度越来越低，且江苏省各地级市空间内部差异性越来越小。［结论］江苏省土地生态安全指数朝着较好态势发展，空间格局变化显著。

Abstract:

Previous studies always focus on the analysis in some parts of Jiangsu province, but never analysis the ecological security of land about the whole province. In order to solve the contradiction between land utilization and ecological security. Based on the evaluation index system,we calculated the weights by entropy weight method. We also monitored the degree of ecological security of land during 2005- 2015 in Jiangsu province by using the early warning of land ecological security monitoring model. We divided the warning level and analyzed the spatial pattern by GIS technology. The ecological security index of Jiangsu province land generally showed a fluctuated upward trend, indicated that land ecological environment of Jiangsu province was of great condition in the past decade, and the effects were obvious, but in 2007 and 2012 there were two from a low ebb; from the perspective of spatial pattern,the land ecological system improved, the level of early warning declined, and internal spatial gap among cities of Jiangsu province narrowed. The ecological security index of Jiangsu province land increasingly high, spatial pattern evolution significantly, the land ecological safety index in Jiangsu is developing towards a better situation and the spatial pattern has changed significantly.