基于改进SPA的关中地区水土资源承载力综合评价

针对水土资源承载系统的不确定性,在了解集对分析原理的基础上,利用原创联系度的可展性对其进行改进,将三级评判扩展到五级评判,进而建立基于改进SPA的水土资源承载力综合评价模型,并用该方法对关中地区影响水土资源承载力的20项指标进行评价,得到关中地区各地市水土资源承载等级。在综合评价中,用主客观权重相结合的方法确定权重以提高权重的可靠性,为了验证改进SPA的合理性,将其评价结果与改进模糊综合评价结果进行比较,结果表明:①关中地区除咸阳和渭南2008年水土资源承载等级为Ⅱ级外,其他地市均为Ⅲ级,承载基本平衡;②在水土资源承载力评价中,用集对势区间定位或同一度判定样本等级均具有可行性和合理性,改进SPA评价结果准确可靠、合理直观,能更细致地描述样本承载水平,为水土资源承载力研究提供了一种科学合理且简单实用的评价方法。

Comprehensive Evaluation for Soil-Water Resources Carrying Capacity in Guanzhong Area Based on Improved Set Pair Analysis

In view of the soil-water resources carrying capacity(SWRCC)system’s uncertainty,an improved set pair analysis(SPA) model is suggested that utilizing SPA theory and the malleability of the original relation degree to extend the comprehensive evaluation ranking of SWRCC from 3 levels to 5 levels.The model can be used for obtaining the SWRCC level in different cities of Guanzhong area based on 20 influential factors of SWRCC,the SWRCC factors weights are obtained by combining the subjective factor weights and entropy weights to allocate the weight more reliable.The SWRCC comprehensive evaluation results of proposed model is compared with the results of improved fuzzy comprehensive evaluation to prove the rationality of improved SPA.The results of the research firstly demonstrate that the Guanzhong SWRCC ranking at the level of Ⅲ means a basic balance except Xianyang and Weinan which were overload in 2008.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 SWRCC level.