【摘要】 土地生态安全是生态环境保护以及区域生态文明建设的基础。以长江经济带的重要节点重庆市为研究对象,基于DPSIR—EES模型构建区域土地生态安全评价体系,在运用TOPSIS法揭示了重庆市土地生态安全整体变化状况的基础上,通过ESDA—GIS法开展了区域土地生态安全时空分异研究。结果表明:(1) 2009—2016年,重庆市土地生态安全呈现波动上升的趋势,土地生态安全由"敏感级"向"良好级"转变;土地生态安全各子系统整体趋于好转;(2) 2009—2016年,主城区土地生态安全有所退化,而渝西片区、渝东北片区、渝东南片区得以改善;总的来说,土地生态安全"敏感级"和"危险级"集中于主城区和渝西片区,而"临界级"和"良好级"主要分布在渝东北及渝东南片区;(3)重庆市土地生态安全存在较强的空间正相关和聚集性,其"高—高"和"低—低"值区呈现增加趋势,"高—高"和"低—低"值区的分布与自然生态状况、人类活动密切相关。研究结果能为区域的土地生态系统保护与社会经济可持续发展提供参考依据。更多还原

【Abstract】 Land ecological security is the basis of ecological environmental protection and regional ecological civilization construction. Based on DPSIR—EES model, the evaluation system of regional land ecological security of Chongqing City which is an important node of the Yangtze River Economic Zone is constructed. On the basis of the overall change of land ecological security in Chongqing City diagnosed by TOPSIS method, the spatial and temporal differentiation of regional land ecological security is studied by using ESDA—GIS method. The results show that:(1) the land ecological security of Chongqing City presents the fluctuating upward trend, and changes from ‘sensitive level’ to ‘good level’, and the subsystems of land ecological security tend to improve as a whole from 2009 to 2016;(2) from 2009 to 2016, the land ecological security of the main urban area had deteriorated, while the western, northeastern and southeastern parts of Chongqing City had improved; to be specific, the ‘sensitive level’ and ‘dangerous level’ of land ecological security concentrate in the main urban area and the western part of Chongqing, while the ‘critical level’ and ‘good level’ mainly distribute in the northeastern and southeastern parts of Chongqing City;(3) land ecological security in Chongqing the presents the strong positive spatial correlation and aggregation, and its ‘high—high’ and ‘low—low’ value areas present the increasing trend, and the distribution of the value is closely related to the natural ecological conditions and human activities. The results of this study can provide the reference for the protection of regional land ecosystem and the sustainable development of social economy.更多还原