基于信息熵的县域土地利用结构变化与分布研究

信息熵是对系统的不确定性(无序性)的一种量度,其演变在一定程度上可以反映区域各类土地利用类型的动态演变规律,也可以反映区域土地的分布。根据信息熵原理研究了重庆市荣昌县土地利用结构变化及分布,并与重庆市进行了比较。结果表明,从时间变化看,荣昌县土地利用结构信息熵在1996~2005年一直处于上升状态,1996年土地利用结构信息熵最低,为1.306 5,2005年达到最大值1.450 8,正处于"凸"型非线性增加态势;从空间变化看,信息熵的大小与经济发展水平密切相关,信息熵大,经济发展较好。荣昌县土地利用信息熵比重庆市水平低,且二者变化趋势差别很大,重庆市信息熵波动较大。

Research on Land-use Change Structure and Distribution of County Region Based on the Information Entropy

Information entropy was a kind of quantity of the system uncertainty(disorder).To some extent,its evolution could reflect the dynamic evolution rule of various land-use types in region,and could also reflect the distribution of regional land.According to the information entropy principle,the land-use structural change and the distribution of Rongchang county in Chongqing city were studied,and were compared with that of Chongqing city.The results showed that,from the time change,the information entropy of land use structure of Rongchang county was always in the rise state in 1996～2005,that was lowest in 1996,being 1.306 5,and that was maximum in 2005 being 1.450 8,which was in a "convex" nonlinear increasing state.From space changes,the information entropy size and economic development level were closely related.The information entropy was larger,and the economic development was better.The information entropy of land-use of Rongchang county was lower than that in Chongqing city,and the two change trends were significantly different,with the information entropy fluctuation of Chongqing municipal being bigger.