The Study On The Changes Of Land Use Structure And Land Use Efficiency: A Case Of Gu’an City

Gu’an City, which is a less economically developedcounty-level city, is animportant industrial area located in the center of Hebei Province. But factors such asthe rising demand to land, the irrational land use structure, the disordered functionlayout, the deterioration of the ecological environment, and so on, are limiting theimprovement of land use benefits and achievement of maximization land usebenefits.Land use structure optimization can improve the land use efficiency. Thestudy on correlation analysis of the changes of land uses structure and land useefficiency provides references for the less economically developed county-level citiesthat are developing fast against the background of urbanization.In this paper, land use dynamic index is used to depict the change rate of land usetypes from2000to2009in Gu’an City. With the help of the concept of Informationentropy model, the dynamic temporal changes of information entropy and equilibriumdegree and dominance degree of land-use structure in Gu’an City are analyzed.Considering the real situation of land use in Gu’an City, the land use benefitsevaluation index system is established based on economy, society and environment.And according to the principle of Rough set attribute reduction to screen the finalindexes. The coefficient of variation is used to calculate the index weight. Then getdifferent benefits values through the comprehensive evaluation model includingeconomic benefit, social benefit, ecological benefit and comprehensive benefit.Finally, gray correlation degree model running in DPS software is used to analysis therelationship and inherent law between the changes of land use structure and thechanges of land use benefits in Gu’an City from2000to2009.The analysis results are as follows:(1) the change of land use structure is notobvious from2000to2005, but it changes sharply from2005to2009. Theinformation entropy and equilibrium degree of land use structure in Gu’an City hassimilar changing trends and they’ve been through four different periods which is thesteady phase from2000to2002, the rapid upswing phase with fluctuation from2002to2005, the fast decreasing period from2005to2007, and the steady rising periodfrom2007to2009. However, the change of dominance degree has the opposite trend.Land use system in Gu’an City experienced the process of ‘stable system’, to‘disorder system’, to ‘well-ordered system’, to ‘disorder system’.(2) The land useeconomic benefit, land use social benefit, land use ecological benefit, and land use comprehensive benefit increased over the period from2000to2009. And the benefitlevel also grew during the period. There is a linear relationship between land useeconomic benefit and land use comprehensive benefit. To some extent, the economicbenefit promotes the rise of comprehensive benefit.(3) The land use types ofcommunications land, the rural and the independent industrial mines land, waterconservancy facilities, and garden land are closely related to the economic benefit,social benefit, and comprehensive benefit. The land use types of cultivated land, forestland, and garden land are closely related to the ecological benefit. There is a clearlinkage between information entropy of land use structure and the land use benefit.The changes of information entropy affect the same change direction ofcomprehensive benefit. The land use structure has immediate effect and accumulationeffect on land use benefits.