南京市土地利用强度指数异质性研究

Study on spatial heterogeneity of land use intensity in Nanjing

以南京市江宁区和溧水县为例,利用半方差变异函数和分形维数对研究区两个时段的土地利用强度指数进行了空间变异特征分析。研究表明:变异函数基台值的增加和变程的下降说明从1988年到2001年研究区建筑用地急剧增加,打破了土地利用强度在空间范围内的平稳性。2001年与1988年相比,研究区空间结构比例较高,表明城市化过程中土地利用状况仍主要受客观地形等结构性因素影响,存在着明显的集聚效应;同时2001年分形维数也较高,表明其空间变异性较为剧烈,此时人的干扰情况较为复杂,呈现明显异质性。研究同时表明对土地利用强度指数进行空间异质性分析能挖掘出更多的土地利用信息。

Taking Jiangning and Lishui districts in Nanjing as study areas, spatial heteroseneity of land use intensity in two periods was analyzed. The result showed： the value of sill increasing and the value of range dropping reflect that building areas grew so sharply from 1988 to 2001 that it broke the spatial stability of land use degree. Compared with 1988, spatial structure proportion of study area in 2001 was higher which means urbanization process was still mainly affected by objective factors such as terrain and bad obvious accumulative effect; at the same time fractal dimension in 2001 was higher than 1988 which showed spatial heterogeneity of land use intensity in 2001 changed fiercely and the effect taken by human became more complex. The result of research simultaneously indicated that more information about land use could be mined by analyzing spatial heterogeneity of land use intensity.