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研究不同空间尺度下城市土地利用的演变过程和变化特征,有助于深入了解和揭示城市土地利用演变时空差异和内在影响机制。以重庆市主城区为例,基于研究区1978~2013年多时序的MSS和Landsat TM/ETM+遥感影像数据,利用Arc GIS技术和景观格局分析理论,从研究区整体尺度、区域尺度和各区尺度等3种空间尺度对研究区建设用地演进特征和景观格局动态变化进行分析。结果表明:(1)1978~2013年研究区不同空间尺度建设用地面积变化趋势基本相似,综合扩展程度指数变化特征也存在一定的规律。在2001年之后研究区建设用地演进过程由低缓发展向高速递增阶段过渡,各区尺度建设用地扩展深受地貌、经济、政策、交通等影响因素的干扰;(2)在不同空间尺度新增斑块数目对比中,边缘扩展模式与跳跃扩展模式的主导优势先后发生3次转换,而在新增斑块面积比对比中边缘扩展模式始终保持绝对优势,填充扩展模式分别在新增斑块数目和面积比的比较中均处于弱势;(3)随着时间的变化,就整体尺度上景观指数变化而言,景观破碎度和景观多样性明显增加,斑块形状趋于简单和规则化,斑块之间连通性不断提高,与城市化进程趋于吻合。但区域尺度和各区尺度深受国家政策环境的影响,景观指数变化则相对复杂。研究结论有助于从空间尺度对城市扩展信息进行挖掘和理解,为其城市规划和土地管理提供一定的科学依据。
Studying the evolution and change characteristics of urban land use under different spatial scales helps to understand and reveal the spatial and temporal differences and inherent mechanisms of urban land use evolution. Taking the main urban area of Chongqing as an example, based on the MSS and Landsat TM / ETM + remote sensing image data from 1978 to 2013 in the study area, using Arc GIS technology and landscape pattern analysis theory, from the overall scale, regional scale and regional scale Three kinds of spatial scales were used to analyze the evolution characteristics of construction land and the dynamic changes of landscape pattern in the study area. The results show that: (1) The change trend of construction land area at different spatial scales from 1978 to 2013 is basically similar, and there are some regularities in the index of comprehensive expansion degree. After 2001, the evolvement process of construction land in the study area changed from low-speed development to high-speed increase phase. The expansion of scale construction land in each area was greatly disturbed by factors such as landform, economy, policy and traffic. (2) Plaques were added at different spatial scales In comparison with the number of edges, the dominance of the edge extension mode and the leap expansion mode successively changed three times, while the edge extension mode always maintained an absolute advantage in the new patch area ratio contrasting. The number of new fillings and the area (3) With the change of time, the degree of landscape fragmentation and landscape diversity increased significantly with the change of landscape index on the whole scale, the shape of the patch tends to be simple and regularized, Inter-connectivity continues to increase, and urbanization tends to coincide. However, the scale of the region and the scale of each district are greatly affected by the national policy environment, and the change of the landscape index is relatively complicated. The conclusions of the study help to excavate and understand the urban extension information from the spatial scale and provide some scientific evidences for urban planning and land management.