1995-2015年三峡库区土地利用变化分形研究

运用分形理论从空间形态视角基于分形维数模型对1995-2015年三峡库区土地利用变化进行分形研究.结果表明:①1995-2015年研究区土地利用斑块分形维数均小于临界值1.5,分形维数平均值由1.162 1下降至1.126 6,整体空间形态随时间变化趋于规则,空间结构趋于稳定;②1995-2015年,耕地斑块分形维数呈增加趋势,空间形态趋于不规则,空间结构趋于不稳定,林地、水域和草地分形维数呈降低趋势,空间形态趋于规则,空间结构趋于稳定;③建设用地和未利用地分形维数呈"先升后降"趋势,由于上升幅度均小于下降幅度,因而建设用地和未利用地空间形态整体趋于规则,空间结构趋于稳定.

Fractal Analysis of Land Use Change in Three Gorges Reservoir Area during 1995-2015

From space morphology angle,based on the fractal theory,using fractal dimension model the fractal characteristic of land use change were analyzed in Three Gorges Reservoir Area from 1995 to 2015.It indicated that the fractal dimension of each land use class was less than the critical value of 1.5.The average value of fractal dimension dropped from 1.162 1 to 1.126 6,so the spatial morphology and structure tended to be more regular and stable from 1995 to 2015.The fractal dimension of cultivated land gradually rose from 1995 to 2015,opposite to that for forestry land,water area and grass land.The spatial morphology and structure of cultivatated land tended to be more irregular and unstable,opposite to that for forestry land,water area and grass land.Because the spatial structure stability of cultivatated land declined,it was critical to deal with the contradiction between development and cultivatated land management in the future.The fractal dimension of construction land and unutilized land rose and then reduced,and rising amplitude is bigger.The spatial morphology and structure of construction land and unutilized land tended to more regular and stable.