甘肃省土地利用结构信息熵动态研究

基于Shannon信息熵理论,分析研究了甘肃省土地利用结构信息熵的动态变化,并对影响信息熵值大小的土地利用类型做了初步探讨.结果表明,1997~2004年,甘肃省土地利用结构信息熵较全国水平低,熵值呈现单调递增趋势,说明该区土地利用系统朝相对无序状态演变.在8个土地利用一级类型中,面积总体呈上升趋势的有园地、林地、居民点及工矿用地、交通用地和未利用地,它们与土地利用结构信息熵呈正相关;面积总体呈下降趋势的有耕地、牧草地和水域,它们与土地利用结构信息熵呈负相关.其中,林地和耕地的面积与该区土地利用结构信息熵的变化显著相关,是信息熵值变化的主要影响因子,然后依次为园地、交通用地、牧草地、居民点及工矿用地、未利用地和水域.

Study on dynamic variation of Shannon entropy of land use structure in Gansu Province

Based on Shannon entropy theory,the dynamic variation of Shannon entropy of land use structure in Gansu Province was studied,and a preliminary discussion of relationship of land use types to the entropy values was made.The results showed that the entropy value of land use structure in Gansu increased gradually from 1997 to 2004,and the value of Shannon entropy of land use structure of the province was rather lower in comparison with the general level of the whole country,and the land use system of Gansu Province was proved in a relative chaostic state.Among eight types of land use,the areas of garden field,woodland,residential and industrial land,traffic land and unused land had been increasing in general,and the correlation coefficient indicated it appeared to be nagatively correlative to Shannon entropy of land use structure;the areas of cultivated land,mowing and water land had been decreasing,and were positively correlative to Shannon entropy.Especially,the areas of woodland and cultivated land had significant correlation to the entropy,which could be regarded as the key factors influencing the entropy of land use structure in the province,and other factors orderly were garden field,mowing,residential and industrial land,unused land and water land.