基于改进SPA法的耕地占补平衡生态安全评价

Evaluation of eco-security of cultivated land requisition-compensation balance based on improved set pair analysis

针对目前耕地占补平衡生态安全评价系统的不确定性,在理解集对分析(SPA)原理的基础上,利用原创联系度的可展性对其进行改进,将三级评判扩展到四级评判,并结合信息熵法,建立了基于改进SPA法的耕地占补平衡生态安全综合评价模型,并利用该模型对永川区影响耕地占补平衡生态安全的18项指标进行评价,得到永川区2005、2009、2015以及2020年的耕地占补平衡生态安全等级。此外,为了验证改进SPA法的可行性与合理性,将其评价结果与改进模糊综合评价结果以及多指标综合评价结果进行比较,研究结果表明:利用改进SPA法得到2005年永川区耕地占补平衡生态安全级别为Ⅱ级,2009年为Ⅲ级,2015年为Ⅳ级,2020年同样为Ⅳ级,整体上呈现出由Ⅱ级向Ⅳ级上升的趋势;改进SPA法综合评价结果与改进模糊综合评价结果以及多指标综合评价结果基本一致。研究认为利用集对势进行耕地占补平衡生态安全评价具有一定的可行性和可行性,评价结果比较贴近实际情况,为耕地占补平衡生态安全评价提供了一种科学合理且简单实用的评价方法。

In view of the evaluation of eco-security of cultivated land requisition-compensation balance system′s uncertainty,an improved set pair analysis（SPA） model is quoted that utilizing SPA theory and the malleability of the original relation degree to extend the comprehensive evaluation ranking of the evaluation of eco-security of cultivated land requisition-compensation balance from 3 levels to 4 levels.It can be used for obtaining the evaluation of eco-security of cultivated land requisition-compensation balance level in different years of Yongchuan district based on 18 influential factors with the theory of entropy weight and improved SPA.,The comprehensive evaluation results of proposed model of the evaluation of eco-security of cultivated land requisition-compensation balance is compared with the results of improved fuzzy comprehensive evaluation and comprehensive assessment to prove the rationality of improved SPA.The results showed that the eco-security of cultivated land requisition-compensation balance of 2005 were Ⅱ,the grade of 2009 were Ⅲ,and the grade of 2015 and 2020 were Ⅳ.The whole level of cultivated land requisition-compensation balance in Yongchuan district had been in improving trends that jumping to Ⅳfrom Ⅱ from 2005,2009,2015 and 2020.Compared with improved fuzzy comprehensive evaluation and comprehensive assessment,the results of three methods are basically consistent.Then it shows the evaluation results of improved SPA are reliable,reasonable and visualized,and the improved SPA is a scientific and practical evaluation method that can more meticulously describe the cultivated land requisition-compensation balance level level.