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针对传统农业区内耕地生态安全状况,以河南省周口市为研究区域,基于人与耕地相互作用机理,运用改进的PSR模型构建适用于研究区域的评价指标体系,采用组合赋权法和多因素综合评价法,对2001-2013年间全市及下属10个县区的耕地生态安全水平进行时空格局分析,结果表明:(1)从时间尺度上看,周口市耕地生态安全综合值呈现出“下降—上升—下降—上升”的波动变化且安全值相对较低,相应的安全等级也经历了“较不安全—临界安全—较安全—临界安全”的倒“U”型发展阶段.(2)从空间尺度上看,各县区耕地生态安全状况存在着明显的地带性差异.安全和较安全区主要集中在周口市的中部和西南部地区,并随着安全状况的变化向东部、北部扩展或缩减;临界安全区的分布变动幅度较大,但主要集中在周口市北部、东部和南部6个县区;较不安全和不安全等级仅在2001年和2003年有所分布.2001年较不安全区主要集中在南部的项城和沈丘,但随着环境的继续恶化,到了2003年,该分布范围蔓延到了东北部的郸城和鹿邑,并且项城沦为了研究期内唯一的不安全分布区.
Aiming at the situation of arable land ecological security in traditional agricultural areas, taking Zhoukou city of Henan Province as the study area, based on the interaction mechanism between human and arable land, an improved PSR model was used to construct the evaluation index system applicable to the study area. The combination weighting method and multi- The results showed that: (1) From a time scale point of view, the integrated value of ecological security of cultivated land in Zhoukou City showed a decrease of “ - Rise - Fall - Rise ”and the relatively low safety value, the corresponding safety level has also experienced“ U ”development of“ less secure - critical safety - safer - critical safety ” (2) From the spatial scale, there is a significant difference in zonation of cultivated land ecological security in all counties.Security and safer areas are mainly concentrated in the central and southwestern regions of Zhoukou City, and with the change of security status And expanded or contracted to the east and north. The distribution of the critical safety zone changed greatly, but it mainly concentrated in 6 counties in the north, east and south of Zhoukou City. The less safe and unsafe levels were only in 2001 and 2 2003. The less-secure areas in 2001 mainly concentrated in Xiangcheng and Shenqiu in the south. However, as the environment continued to deteriorate, by 2003, the distribution spread to Dancheng and Luyi in the northeast, and Xiangcheng became the only unsafe distribution of the study period.