基于物元分析-DPSIR概念模型的重庆土地生态安全评价

构建基于驱动力-压力-状态-影响-响应（DPSIR）概念框架的土地生态安全评价指标体系，借助灰色关联模型进行赋权，引入物元分析法对重庆市土地生态安全进行评价，研究结果表明：①1997年重庆土地生态安全属于不安全等级，2001年属于较安全、2005年属于不安全、2009和2012年属于安全等级，表明1997~2012年重庆市土地生态安全总体呈现转好趋势，但由于关联度均小于0，土地生态安全的水平不稳定；②重庆市土地生态系统脆弱，承载干扰的能力较弱；③1997直辖后，经济社会的发展，环境保护意识的提升，政府部门生态环境建设力度和环保投入的加大是重庆市土地生态安全有效提升的保障.人口增加，经济社会以及城市化的快速发展，农业面源污染等是重庆市土地生态安全的制约因素；④该评价模型和指标体系适用性较强，评价结果较为客观，为土地生态安全评价提供了一个方法的参考.

Evaluation of land ecological security in Chongqing based on the matter-element analysis-DPSIR model

This paper builded evaluation index system of land ecological security based on driving force-pressure-state- impact-response (DPSIR) conceptual framework, using grey correlation model of empowerment, and introduced matter-element analysis method to evaluate land ecological security in Chongqing, the results showed that: ①In 1997and 2005, land ecological security of Chongqing belonged to unsafe level; In 2001, at a safer level; In 2009 and 2012, at a safe level, in 1997~2012 showed a trend of turned for the better, but as a result of correlation degree less than zero, the land ecological security level was not stable. ② Fragile land ecological system in Chongqing, weak bearing interference ability; ③After Municipalities directly under the central government in 1997, the development of society and economy, the environmental protection consciousness promoting, government efforts in ecological environment construction and Environmental protection investment increasing were guarantee of effective promotion of land ecological security in Chongqing. Population growth, the rapid development of economic society and urbanization, agricultural non-point source pollution were limiting factors of land ecological security. ④The applicability of the evaluation model and index system was stronger, the evaluation results more objective, provides a reference for land ecological security evaluation method.