苏南地区建设用地扩展类型及景观格局分析

改革开放以来，随着苏南地区经济高速发展，工业化及城市化进程加快，导致建设用地急剧扩张。为了研究苏南建设用地扩展类型，基于1980～2010年建设用地数据，利用ArcGIS 93软件识别并提取了3种建设用地扩展类型：填充型、边缘增长型和跳跃型，并分析了建设用地扩展类型景观格局时空动态及其驱动力。结果表明：1980～2010年，苏南地区的建设用地面积增加了44582%，其中1980～2005年增加了16373%；2005～2010年增加了10696%，常州市建设用地的扩展速率最大，为75286%。1980～2005年，苏南地区边缘增长型占据了7403%，其次是跳跃型与填充型，而2005～2010年，建设用地扩展类型的比重仍与1980～2005时段相一致，但变化更为剧烈。建设用地扩展类型的斑块个数均处于增加趋势，3种扩展类型的形状区域复杂，建设用地扩张景观类型破碎化严重但其链接度仍较高。苏南5市的填充型扩展类型主要集中于城市中心附近，而跳跃型主要分布于远离城市的区域。苏南地区经济快速发展、人口增加、工业化进程、房地产投资、外资直接投资、固定资产投资都在影响着建设用地的扩展

URBAN EXPANSION AND LANDSCAPE PATTERN ANALYSIS IN THE SOUTH OF JIANGSU,CHINA

Since reform and opening in 1978, southern Jiangsu Province has undergone rapid economic, industrial development and urban expansion. However, what is the spatial and temporal dynamics of construction land from 1980 to 2010? How to distinguishthe types of construction land expansion is important to understand the morphology of urban expansion. Landsat 5 TM imageries within 2010 covering the south of Jiangsu Province were selected and classified for land use with overall accuracy and Kappa coefficient 87.5% and 0.82 respectively, and seven land use types, specifically, woodland, grassland, farmland, wetland, water body, construction land and unused land were considered. The land use maps in 1980 and 2005 were from Chinese Data Sharing Infrastructure of Earth System Science. The two sources of land use maps were geo referenced. The land use maps in the south of Jiangsu Province from 1980 to 2010 were overlaid by ArcGIS 9.3 software. Then the construction land expansion types of infilling, edge expansion and outlaying were recognized and extracted using topology theory in ArcGIS 93 software. Finally, the spatial and temporal dynamics of construction land expansion types and driving factors were further analyzed. The results showed that the area of construction land increased by 44582% in the southern Jiangsu Province from 1980 to 2010, with an increase of 163.73% from 1980 to 2005 and 10696% from 2005 to 2010. The construction land expansion rate of Changzhou was the maximum for the period of 1980-2010 with 75286%. The major construction land expansion type in the south of Jiangsu Province was the edge expansion type, which occupied approximately 7403% from 1980 to 2010, and the followed were outlaying and infilling types, which owned the area of 41765 km2 and 11759 km2 for the period of 1980-2005. The percentages of construction land expansion types were similar as the period of 1980-2005 but changed dramatically for the period of 2005-2010. From the spatial distribution analysis of construction land expansion types in the south of Jiangsu Province, the infilling type was mainly located in the area nearby the city center in the five cities, while the outlaying type was mainly located in the area far away from the city center. The patch numbers of construction land expansion types were increasing from 1980 to 2010. The shapes of three construction land expansion types became increasingly complicated because of the increasing landscape shape indices for the period of 1980-2010. The fragmentation of three construction land expansion types was more serious due to higher split index. However, they still kept the higher connectivity with the high COHESION values. Construction land expansion in the south of Jiangsu Province had the close relationship with economic rapid development, population booming, industrialization, real estate investment, foreign direct investment and fixed assets investment. The method to distinguish the construction land expansion types based on GIS and remote sensing was a convenient approach in the different regions, especially the developing countries without enough urban monitoring, planning and management datasets