摘要
【目的】对定西市农田生态系统空间分异特征进行研究,以期为该地区农田功能区划与管理、促进农田生态系统的可持续发展提供科学依据.【方法】运用能值分析方法,对2014年定西市7个县(区)农田生态系统的环境资源条件、投入产出结构和可持续性进行分析,并运用主成分分析方法对其进行综合评价和排序.【结果】定西市农田生态系统可持续性强的是漳县和岷县,可持续发展指数分别为1.35和1.33,其他县(区)农田生态系统可持续发展指数均小于1,可持续性较弱,为消费型生态经济系统;定西市农田生态系统能值综合水平地域差异明显,呈"南部→中部→北部"递减的地理分布特征.【结论】定西市农田生态系统可持续性总体较弱,强、弱、不协调发展型区域农田面积分别占全市农田总面积的14.44%,49.46%,36.10%.
【Objective】The study was to provide scientific basis for field functional division and management and improving the sustainable development of farmland ecosystem.【Method】Based on the systematical analysis of resources environment,input and output structure and sustainability of the farmland ecosystem in 7 counties of Dingxi in 2014 with the energy analysis,and the farmland ecosystem was comprehensively evaluated and sorted by principal component analysis method.【Result】The research showed that Zhangxian and Minxian had higher sustainability of farmland ecosystem and the sustainable development index was 1.35 and 1.33,respectively.Other counties had low sustainability and belonged to consumptiontype eco-economic system,with sustainable development index respectively less than 1.There was clear regional difference in energy level among farmland ecosystems in Dingxi presenting the decreasing trend of＇Southern-Central-North＇in the geographical distribution.【Conclusion】The sustainability of farmland ecosystem in Dingxi generally was weak,regional farmland area characterized by strong-coordinated,weak-coordinated and non-coordinated development accounted for 14.44%,49.46%,36.10%,respectively of the total area of the city＇s farmland.
出处
《甘肃农业大学学报》
CAS
CSCD
北大核心
2017年第5期97-102,111,共7页
Journal of Gansu Agricultural University
关键词
定西市
农田生态系统
主成分分析
能值
空间分异
Dingxi city
farmland ecosystem
principal component analysis
energy
spatial heterogeneity
