基于熵值法的中国省域耕地生态安全评价

发布时间：2018-02-25 05:23

本文关键词： 耕地生态安全安全等级熵值法综合评价　出处：《江苏农业科学》2017年09期 　论文类型：期刊论文

【摘要】：耕地生态安全评价是改善农田生态系统、促进耕地可持续利用的基础性工作。根据耕地资源生态安全内涵及其影响因素,从自然、社会、经济3个方面选取17个指标,构建了耕地生态安全评价指标体系,选择熵值法确定指标权重,并运用综合评价模型计算全国省域单位2005—2014年的耕地生态安全指数,划分耕地生态安全等级。结果表明:近10年来全国总体耕地生态安全等级由"临界安全"逐步转变为"较不安全",耕地生态安全指数整体呈波动下降态势,耕地生态安全朝逆向演化的方向发展。北京市、上海市近10年耕地生态安全相对稳定,且基本处于"较安全"等级;2006—2014年天津市耕地生态安全等级经历"较安全—临界安全"的变化,但在2012年后有明显提升;2006—2014年吉林、黑龙江耕地生态安全明显呈下降态势,大致经历了"临界安全—较不安全—临界安全"的演变历程;近10年江苏、浙江、新疆、西藏、内蒙古、海南地区耕地生态安全相对稳定,处于"临界安全";云南、贵州、广西地区耕地生态安全指数呈波动上升趋势,但也处于"不安全"等级;其他地区近10年耕地生态安全总体上虽然小有波动,但一直处于"较不安全"等级。
[Abstract]:The evaluation of cultivated land ecological security is the basic work to improve farmland ecosystem and promote the sustainable utilization of cultivated land. According to the connotation of ecological security of cultivated land resources and its influencing factors, 17 indexes are selected from three aspects of nature, society and economy. The evaluation index system of cultivated land ecological security is constructed, the index weight is determined by entropy method, and the cultivated land ecological security index of national provincial units from 2005 to 2014 is calculated by using the comprehensive evaluation model. The results show that the overall cultivated land ecological security level has gradually changed from "critical safety" to "relatively unsafe" in recent 10 years, and the overall index of cultivated land ecological security has fluctuated and decreased. The ecological security of cultivated land has developed in the direction of reverse evolution. In Beijing and Shanghai, the ecological security of cultivated land has been relatively stable in the past 10 years. The ecological security of cultivated land in Tianjin experienced the change of "safer-critical safety" from 2006 to 2014. However, after 2012, there was a significant improvement in Jilin Province from 2006 to 2014, and the ecological security of cultivated land in Heilongjiang Province decreased obviously. In the last 10 years, the ecological security of cultivated land in Jiangsu, Zhejiang, Xinjiang, Tibet, Inner Mongolia and Hainan is relatively stable and is in "critical safety". The index of ecological security of cultivated land in Guangxi shows an upward trend, but it is also in the rank of "unsafe", while the ecological security of cultivated land in other regions generally fluctuates slightly in the past 10 years, but it has always been in the level of "relatively unsafe".
【作者单位】：西南大学地理科学学院;
【基金】：国家社会科学基金重大项目(编号:15ZDC032)
【分类号】：F323.211

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