基于熵值函数模型的土地利用变化响应研究——以四川省阆中市为例

Research on Landuse Change Response Based on Information Entropy——A Case Study of Langzhong City,Sichuan Province

应用熵值函数模型和灰色关联分析,对阆中市土地利用结构变化的响应机理做了定量化分析。结果表明,1997—2006年10a间,阆中市土地利用结构信息熵基本呈稳定态势,土地利用系统的有序度较高。1997—2002年地均产值、公路密度、社会商品零售总额、非农人口比重、非农产业和农产业的产值比、固定资产投资为强关联要素,其关联度达到0.70以上,人均GDP为中关联要素,关联度为0.65769。而2003—2006年,7项指标均演变为中关联要素,均在0.35～0.70之间。研究认为政府行为和社会经济因素是影响其土地利用结构变化的两个主要驱动因子。

Using the entropy model and grey correlation analysis and taking Langzhong City, Sichuan Province as an example, this paper analyzes the structure of landuse changes and the response mechanisms in the city. The grey correlation analysis indicates that the information entropy of landuse structure in Langzhong City was stable during the last decade. From 1997 to 2002, landuse structure entropy was closely related to per-land GDP, road density, retail sales of consumer goods, proportion of non-agricultural population, land economy density, ratio of non-agriculture and agriculture, and the correlation degree of above 0. 70. The entropy was moderately related to per-capital GDP, with the correlation degree being 0. 657 69. However, between 2003 and 2006, landuse structure entropy was moderately related to all the above seven factors, with the correlation degree ranging from 0.35 to 0. 70. Further research suggests that socio-economic factors and government action are two main driving forces to the changes in landuse structure.