长汀县土地利用动态变化及生态安全评价

Dynamic Changes of Land Use and Ecological Security Evaluation in Changting County

以水土流失治理区长汀县为研究区域,基于2005、2010、2015、2019年4期遥感影像,应用ENVI、ArcGIS等技术,获取土地利用现状数据,分析该区域2005—2019年的土地利用变化特征;在此基础上,运用PSR模型选取18个指标构建生态安全评价指标体系,分析长汀县土地生态安全状况.研究结果表明:(1)2005—2019年长汀县土地利用类型以林地为主,耕地次之;单一动态度最高的是未利用地和建设用地,最少的是林地;综合动态度最高的是2005—2010年;(2)2005—2019年长汀县土地生态安全总体呈现上升态势,生态安全综合指数从0.2307上升至0.6495,生态安全等级由不安全状态提升至较安全状态;研究期间各子系统指数呈现出不同的发展态势.压力指数先下降后略有回升,状态指数先快速上升后略有下降,响应指数呈现快速上升—略微下降—快速上升的趋势.研究结果真实反映出长汀县的土地生态安全发展状况,为未来发展决策提供参考依据.

Taking Changting County as research area,which is the soil loss control area,the research is based on four phases of 2005,2010,2015,and 2019 remote sensing images,applying ENVI,ArcGIS and other technologies to obtain land use status data,and analyze the characteristics of land use changes in the area from 2005 to 2019.On this basis,18 indicators are selected using the PSR model to construct an ecological security evaluation index system to analyze the land ecological security status of Changting County.The research results show that:(1)From 2005 to 2019,forest was the main land use type of Changting County,followed by cultivated land;the single most dynamic was unused land and construction land,the least was forest land,and the most comprehensive dynamic was 2005-2010.(2)From 2005 to 2019,the overall ecological security of land in Changting County showed an upward trend.The comprehensive ecological security index rose from 0.2307 to 0.6495,and the ecological security level was raised from an unsafe state to a relatively safe state.The system index showed different development trends.The pressure index first declined and then rebounded slightly,the state index first rose rapidly and then declined slightly,and the response index showed a trend of rapid rise-slight decline-rapid rise.The research results truly reflect the development of land ecological security in Changting County and provide a reference for future development decisions.