定西市农田生态系统能值空间分异特征研究

发布时间：2017-12-26 22:02

本文关键词：定西市农田生态系统能值空间分异特征研究　出处：《甘肃农业大学学报》2017年05期 　论文类型：期刊论文

【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%.
[Abstract]:[Objective] to study on spatial distribution of farmland ecosystem in Dingxi, so as to provide scientific basis for planning and management of farmland, the area function to promote the sustainable development of the farmland ecosystem. [method] by the method of emergy analysis, on 2014 in Dingxi City, 7 counties (districts) environmental resources, farmland ecological system the input-output structure and sustainability analysis, and principal component analysis method to conduct a comprehensive evaluation and ranking. [result] Dingxi farmland ecosystem sustainability is strong and sustainable development of Minxian Zhang county, the numbers were 1.35 and 1.33, other counties (districts) sustainable development index of farmland ecosystem were less than 1, the sustainability of ecological economic system is weak, consumption type; Dingxi city farmland ecosystem emergy comprehensive level obvious regional difference in geographical distribution in southern, central and Northern. " [Conclusion] the sustainability of farmland ecosystem in Dingxi is generally weak. The farmland area of strong, weak and uncoordinated development area accounts for 14.44%, 49.46%, 36.10%. of the total farmland area of the city, respectively.
【作者单位】：甘肃农业大学资源与环境学院;
【分类号】：S181
【正文快照】： 能值(emergy)分析是生态学家Odum于20世纪80年代后期创立的一种新的研究生态经济系统的理论和方法[1].采用统一的能值标准太阳能焦耳(sej),使系统不同类别的能量之间具有可比性和可加性,得出一系列反映系统结构、特征和效率的能值分析指标,用来评价区域生态系统的功能特征和经

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