摘要
研究了兰州市2006-2013年土地生态安全的时空差异。主要依据PSR模型建立评价指标体系,运用熵权法与综合评价法对不同时期兰州市及各县区土地生态安全状况进行分析。结果表明：（1）兰州市土地生态安全由2006年的＂恶劣＂状态转变为2013年的＂良好＂状态;（2）土地生态压力指数从0.176下降为0.145,土地生态状态与土地生态响应指数分别从0.063、0.160提升到0.295、0.290;（3）区域内空间分布差异较为明显,土地生态状态改善与响应增强主要集中在土地生态压力过大的地方。据此可知,兰州市土地生态结构和功能基本完善,已步入良好阶段,但是各县区土地生态空间分布差异较大。
The spatiotemporal differences of land ecological security of Lanzhou from 2006 to 2013 were studied through entropy weight method and comprehensive evaluation method with land ecological security evaluation index system established with PSR model.The results showed that the land ecological security changed from＇bad＇in 2006to＇good＇in 2013.Land ecological security pressure index decreased from 0.176 to 0.145,land ecological state and land ecological response index increased from 0.063 and 0.160 to 0.295 and 0.290 respectively.The regional spatial differences of land ecological security index were obvious,land ecological state improvement and enhanced response mainly concentrated in the area under high land ecological stress.Accordingly,the structure and functions of land ecological state has entered a good stage.
出处
《草原与草坪》
CAS
CSCD
2016年第1期48-54,共7页
Grassland and Turf
基金
国家自然科学基金项目(71263003)
甘肃农业大学青年研究生导师项目"兰州市典型休闲农业发展路径研究"(GAU-QNDS-201307)资助
关键词
兰州市
土地生态安全
时空差异
PSR模型
熵权法
land ecological security
spatiotemporal differences
PSR model
entropy weight method
Lanzhou City
