区域土地利用结构的信息熵分异规律研究

根据对全国及东中西部、浙江省及各地市、杭州市所属的5个县市的土地利用结构信息熵的计算分析,结果表明,土地利用结构的信息熵值可以用来反映一区域土地利用系统的有序程度。一般说来,信息熵值愈大,土地利用系统的有序程度愈低,反之亦然;土地利用结构的信息熵值具有空间分异规律,在全国、浙江省和杭州市3个层面上均表现出信息熵值自沿海向内陆递减;土地利用结构的信息熵值在时间上具有动态演变规律。土地利用结构信息熵可综合反映某区域在一定时段内各种土地利用类型的动态变化及其转换程度,对于区域土地利用结构调整具有指导意义。

The laws of the information entropy values of land use composition

Land use system is a complicated and macro system with dissipative structure.It has orderly characteristics of function and structure.The order degree of land use system is applied to express information entropy values and the applications in the regulation of the land use struc-ture in a region are discussed in this paper.The information entropy values of land use structure in different periods of time and regions sare calculated,and the laws and causes are analysed.Firstly,the information entropy values of land use structure of Lishui city in Zhejiang Province and the province itself covering the peri-od of1990to1999are calculated.The results show that the information entropy values in1990are the lowest and then rise.They fall after they arrive at the highest values.This indicates that the land use systems go through a course from order to disorder and returning to order.Secondly,the information entropy values of land use structure of the whole country and the East region,the Central region,the West region,Zhejiang Province and the cities of the province,Hangzhou city and the five counties under the jurisdiction of the city are calculated.The information en-tropy values decrease progressively from the coastal area to inland.This indicates that the order of land use system increases progressively from the coastal area to inland.The applications of the information entropy values of the land use structure are discussed in the paper.The information entropy values are of guiding significance to the regulation of the land use structure in a region as they can reflect the dynamic change and transformation degree of land use types in a region in a certain period of time.However,the point is how to set remains to be researched with the optimum information entropy value of the land use structure in differ-ent region s.