关键词: 村镇分布, 耕地保护, 村庄撤并, 决策支持, 苏州

Abstract:

Villages and towns, generally spaced 0.5 km apart, are densely distributed in suburban area of Suzhou city. Urbanization has been going on quickly for recent two decades in Suzhou region; the GDP ratio in 2003 is 18% higher than the previous year. Meanwhile, in the suburbs of Suzhou, the villages and small towns have been sprawling gradually in size. However, their spatial distribution form remains unchanged. This study mainly includes the following steps. First, we selected three sampling areas around Suzhou city from satellite images in the year 2000, with 172,145 and 73 villages and small towns in each sampling area, and the densities of villages and towns in sampling areas are 2.2, 4.2 and 3.6/km² separately. Secondly, based on GIS software, we obtained an outline map of villages and towns in the three sampling areas in vector form, and calculated area for each village or town. We classified these 390 villages and small towns by their areas, and found that the area of most villages is at the range of ten thousand to seventy thousand m². Thirdly, we extracted pattern information of short and long axes of polygons of villages and towns from each sampling area, and found out the average length is 121 m at short axis and 428 m at long axis in the whole study area. Comparing satellite images of 1986 with those of 2000, and with the aid of vector map, we can find out that the directions of long axes of villages and towns were mainly affected by river course in the past, and influenced obviously by road course in recent decade. Finally, depending on the distance values between villages or towns, we suggest that if the distance is shorter than 400 m, the smaller village should be merged into a bigger village or town nearby.

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