珠江三角洲土地利用分形特征及其影响机制

该文以遥感影像解译数据为基础，在分析1990、2000和2006年3个时期珠江三角洲土地利用数量变化的基础上，应用分形维数模型计算出珠江三角洲各土地利用类型的分形维数和稳定性指数，对其土地利用空间结构及其区域差异进行了深入研究，应用灰色关联分析法探讨了分形特征的影响机制。研究表明，珠江三角洲建设用地面积快速扩张，耕地、林地面积迅速减少，土地利用空间结构由复杂趋向简单，稳定性不断增强，水域空间结构最复杂，未利用土地最简单，水田、城镇用地、未利用土地的空间结构趋向复杂，其余地类的空间结构趋向简单。各市（区、县）分形特征差异明显，分形变化各不相同。分形特征主要受图斑自身几何性质的影响，人口因素影响在减弱，三大产业中以第一产业影响较大。

Fractal analysis of land use in Zhujiang River Delta

Based on dynamic data of land use in 1990, 2000, 2006, using GIS and fractal modeling, a rapid developed region of the Zhujiang River Delta was selected as study case, the quantitative changes of land use were analyzed, the fractal dimension and stability index of different land use types were calculated, and the region differences of fractal characters were discussed. Using grey relational analysis, the fractal mechanism was studied. Results showed that from 1990 to 2006, construction land was expanded intensively, area of cultivated land and forest was decreased evidently. The land use structure of the Zhujiang River Delta changed complex structures into simple structures, the stability increased constantly. The spatial structure of water bodies was most complex, unused land was most simple. The spatial structures of paddy-fields, town land and unused land became more complex, other land use types more simple. The fractal characters of different regions existed remarkable differences, the fractal changes had sensible differences. The fractal structures were mainly influenced by the geometric properties of spatial pattern of land use, the effect of population was weakening, the primary industry had considerable influence among three industries.