基于PSR-TOPSIS模型的宁夏回族自治区土地生态安全评价

Evaluation of Land Security in Ningxia Hui Autonomous Region Based on PSR-TOPSIS Model

土地生态安全问题是区域可持续发展的核心问题之一。基于PSR-TOPSIS模型构建土地生态安全评价体系,选取处于"一带一路"关键节点的生态脆弱典型区域宁夏回族自治区为研究区域,系统评价其2003—2013年的土地生态安全状况。结果显示:宁夏地区土地整体生态状况呈好转趋势,但仍处于较不安全状态,土地生态环境较恶劣,生态系统功能、结构受损,抗外界干扰能力较差;植树造林、退耕还林、废气、废水及固废的控制与处理、经济效益的提高对研究区域土地生态安全的改善起到了积极作用;而区域本身脆弱的生态环境、经济发展产生的环境污染以及响应政策的不连续性却加剧了土地生态的不安全性。在此基础上,从生态防护体系建设、产业优化升级和生态治理长效机制建立等方面提出了对策建议。

Land security is the one of the keys of the regional sustainable development.Choosing Ningxia Hui Autonomous Region as the study area,the key nodes of‘One Belt and One Road'and typical ecological fragile area,we evaluate land security in 2003—2013by the PSR-TOPSIS model.The results show that:the overall situation of the land security in Ningxia Hui Autonomous Region is better,but is still in the less safety status,bad land environment,broken land ecosystem,poor ability to resist outside interference;the forestation,returning farmland to forest,control and processing of waste gas,waste water and solid waste,the improvement of the economic benefit of the study area have played the positive role in improving the land security of the study area;fragile land ecosystem,pollution caused by economic development and discontinuities in response policy have aggravated the land insecurity.In addition,some suggestions were put forward on based on above research with respect to building the ecology protection forest system,optimization and upgrade of the industrial structure and establishing the mechanism of land ecological management.