大都市区不同土地利用系统转换时空分异特征——以广州市为例

以广州市1990、1995、2000、2005和2010年的土地利用类型矢量数据为基础数据，利用缓冲区分析和洛伦兹曲线等研究方法，构建土地利用转换指数，分析不同人为影响程度下广州市不同土地利用系统的转换空间分异特征。研究结果表明：1）广州市人工系统占比呈逐渐增加趋势，且具有由中心逐渐向外扩展的空间演化特点，自然系统在整个系统中占比逐渐减少，半人工系统在整个系统中逐渐趋于平稳，但重心开始偏移城市中心，逐步向外围扩展；2）广州市土地利用系统功能形态转换整体呈现出由生态、生产功能占主导地位逐步转变为生态、生产、生活3种功能兼顾的功能形态特征；3）广州市土地利用系统间相互转换方式发生转变，1990-2000年的主要转变方式为具有生产功能的半人工系统转变为具有生活功能的人工系统，2000-2010年主要转变方式为具有生态功能的自然系统转变为具有生活功能的人工系统，其中具有生活功能的人工系统驱动着土地利用功能结构的改变。

Spatial-Temporal Differentiation Characteristics of Conversions among Different Land Use Systems in Metropolitan Areas: A Case Study of Guangzhou City

A land use conversion index was constructed based on vector data about land use types of Guangzhou in 1990, 1995, 2000, 2005, and 2010 and in virtue of buffer analysis, Lorenz curve, and other research methods. With this index, analysis was conducted on the spatial-temporal differentiation characteristics of conversions among different land use systems in Guangzhou under different levels of human influences. According to results of the study: 1) the proportion of artificial systems in Guangzhou is on a gradual increase and shows a spatial evolution characteristic of expanding from the center to the outside gradually; the proportion of natural systems in the entire system is decreasing gradually, while semi-artificial systems account for a gradually stable proportion of the entire system but the gravity center of this part begins to deviate from the urban center and expands to the periphery little by little. 2) As a whole, the functional pattern of the land use systems in Guangzhou shows a trend of changing from being dominated by ecological and production functions to a pattern where ecological, production, and living functions co-exist. 3) The mode of conversion among land use systems in Guangzhou has changed. From 1990 to 2000, conversion from semi-artificial systems with production function to artificial systems with living function prevailed, while during 2000~2010, the major conversion was from natural systems with ecological function to artificial systems with living function, with these artificial systems driving the changes in the land use function structure.