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[1]ZHANG Qiyuan.Application of Improved Spatial Lorenz Curve to Study of Land Use Structure[J].Research of Soil and Water Conservation,2015,22(06):340-343,348.

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Application of Improved Spatial Lorenz Curve to Study of Land Use Structure

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 06 Page number: 340-343,348 Column: Public date: 2015-12-28

Title:: Application of Improved Spatial Lorenz Curve to Study of Land Use Structure

Author(s):: ZHANG Qiyuan; Key Laboratory of New Technology in Surveying and Mapping Geographic Information in Plateau of Qinghai Province, Qinghai Geology Mineral Surveying Institute, Xining 810012, China

Keywords:: land use structure; Lorenz curve; Gini coefficient; grid method

CLC:: F301.2

DOI:: -

Abstract:: Lorenz curve and Gini coefficient are the common methods for research on land use structure, but the current methods have problems of a few statistical unit and larger difference of unit area. So fitting Lorenz curve is not very smooth, and the Gini coefficient is not accurate enough. In this paper, the current method is improved by grid method, study area is separated by regular grid, and each grid is a statistical unit. Hence, the number of statistical units increased, and the areas of most statistical units are equal, except statistical units located at edge, which can make the fitting points evenly distributed in Lorenz curve, and that can improve the smoothing degree of Lorenz curve and the accuracy of Gini coefficient. Guishui River Basin was taken as an application case with two Landsat TM images gotten in 1998 and 2009 as basic data. The improved spatial Lorenz curve was used in research on land use structure of Guishui River Basin. The results show that this method can effectively express the structural different of each land use type and its temporal and spatial variation. Farmland is always the most homogeneous distributed land use type, and the most uneven distributed land use type was garden in 1998 and that was water body in 2009. From 1998 to 2009, the distribution uniformity of ecological lands, such as woodland and water body declined; in contrast, the distribution uniformity of artificial land use types such as farmland and construction land improved.

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