兰州市城市土地生态安全评价与时空动态研究

摘要

Land ecological security is very important for sustainable development.This paper took Lanzhou City as an example,from the influence factors of land ecological security,used the comprehensive evaluation meth-od,built the comprehensive evaluation index system of land ecological security,and made comprehensive quantita-tive evaluation for the whole and partition of Lanzhou City.The results showed that:1998—2015,the land ecologi-cal security index of Lanzhou City kept rising, the land ecological security situation had been effective improved;The land ecological security threat in the early stage came from land natural system,but in the later stage,the lim-ited role of land economic system increased gradually, became the main obstacle.Compared with each district of Lanzhou City,the high value of land ecological security appeared in the southeast,the low value of land ecological security appeared in the northwest,the degree of land ecological security in Xigu District was the worst, Yuzhong County was the best.Finally,based on the characteristics of Lanzhou City and Northwest vulnerable region,benefi-cial comments for improving the land ecological safety degree was put forward.%以兰州市为例,从影响土地生态安全的因素出发,运用综合评价法,构建土地生态安全综合评价指标体系,并对兰州市整体及各县区的土地生态安全状况进行定量评估.结果表明:1998—2015年,兰州市土地生态安全指数持续上升,土地生态安全状况得到了有效改善;兰州市土地生态安全的威胁前期来源于土地自然子系统,但后期土地经济子系统的限制作用逐渐增大,成为主要障碍因素;比较兰州市各区域,土地生态安全呈东南高西北低的格局,其中西固区土地安全状况最差,榆中县最好.依据兰州市及西北脆弱区的发展特点,提出改善区域土地生态安全程度的有益建议.