土地生态质量遥感空间分异与主控因子研究——以广安市为例

Research on remote sensing spatial differentiation and main control factors of land ecological quality: taking Guang’an city as an example

本文以广安市为研究区,主要依据遥感数据源,以公里网格为评价单元,基于理想点模型,从生态本底、生态结构、生态效益及生态胁迫4个准则层14个评价指标构建评价指标体系。首先应用德尔菲法(主观法)和熵权法(客观法)相结合的方法计算各评价指标权重值。然后根据以理想点模型计算的结果对土地生态质量进行等级划分,并提取了土地生态质量的主控因子,根据热点模型对土地生态质量的空间分异规律与主控因子之间的关系进行了分析,对广安市2000、2005、2010、2015年的土地生态质量进行了综合评价。最后为土地整治部门提出了有效的土地生态质量监管建议。

In this paper,taking Guang’an city as the research area,based on remote sensing data sources,taking kilometers grid as the evaluation unit,and based on the ideal point model,the evaluation indicators are constructed from the 4 criteria layer 14 evaluation indicators of ecological background,ecological structure,ecological benefits and ecological threat.The system uses Delphi method(subjective method)and entropy weight method(objective method)to calculate the weight value of each evaluation index.Then the land ecological quality is graded according to the result of ideal point model calculation,and the main control land ecological quality is extracted.According to the hot factors of spot model,the relationship between the spatial differentiation rule of land ecological quality and the main control factor is analyzed,and the comprehensive evaluation of land ecological quality in Guang’an city in 2000,2005,2010,and 2015 is carried out.It Provides effective suggestions for land ecological quality supervision for the land remediation department finally.