基于物元分析的成都市土地生态安全评价

Evaluation on ecological security of land in Chengdu based on matter-element model

为进一步科学掌握成都市的土地生态安全状况,基于"经济-环境-社会"(E-E-S)模式构建土地生态安全评价指标体系,采用熵权法计算各指标权重值,并运用物元法构建评价模型,对成都市2005年、2008年、2011年、2014年的土地生态安全进行了评价。研究结果表明,成都市2005-2014年土地生态安全水平不断提高,但提高幅度不够大。从单个指标来看,成都市的人均耕地面积和人均公共绿地面积较低,全社会固定资产投资增长下降,环境污染治理力度不够等是制约成都市土地生态安全水平进一步提高的主要因素。

In order to define the status of land eco - security of Chengdu further and scientifically, the land eco - security evaluation index system is constructed based on the model of ＂economic - environment - society＂ （ E - E - S）, and the entropy weight method is used to calculate the weighted value of index. In addition, the matter - element model is used to study the land eco - security status of Chengdu from2005, 2008, 2011 and 2014. The results show that the land eco - security status of Chengdu was improved from 2005 to 2014, but the growth is not big enough. In terms of single index, the further improvement of land eco - security in Chengdu is confined by the factors including the rather low per capita of cultivated land and public green areas in Chengdu, the declining growth rate of the whole society fixed asset investment, and the insufficient control on the environmental pollution.