基于PSR模型的袁州区土地生态安全评价

Assessment of Land Ecological Security in Yuanzhou District Based on PSR Model

土地生态安全是区域可持续发展的重要保证。针对袁州区土地资源的利用状况和所面临的主要生态问题,应用改进的PSR模型框架,构建了袁州区土地生态安全评价指标体系,并引入相对熵理论计算贴近度的方法确定权重,采用综合指数模型,计算了该区域2005~2014年的土地生态安全综合分值。结果表明:2005~2014年区域土地生态安全整体水平逐渐提高,安全级别由临界级改善至良好级,但土地生态安全问题仍然严峻。另外,土地生态内部压力不协调,应从根本上减少土地生态压力。

Land ecological security is an important guarantee for regional sustainable development. Aiming at the utilization situation of land resources and the main ecological problems in Yuanzhou district,the paper constructed an index system for the assessment of land ecological security in Yuanzhou district based on the improved PSR model,introduced the method of calculating close degree by relative entropy theory to determine the weights of various indexes,and used comprehensive index model to calculate the comprehensive score of land ecological security in this district during 2005 - 2014. The results indicated that： in Yuanzhou district from 2005 to 2014,the general level of land ecological security was gradually improved,and the security level increased from critical level to good level; but the land ecological safety problems in this district were still severe. In addition,the internal pressure of land ecology in this district was not harmonious,thus the land ecological pressure should be radically reduced.