南昌市半城市化地区空间范围识别研究

2017-10-12简红婷叶长盛

江西农业学报 2017年10期

关键词：区域

简红婷,叶长盛*,孙丽

(1.江西省数字国土重点实验室，江西南昌 330013；2.东华理工大学地球科学学院，江西南昌 330013)

南昌市半城市化地区空间范围识别研究

简红婷1,2,叶长盛1,2*,孙丽1,2

(1.江西省数字国土重点实验室，江西南昌 330013；2.东华理工大学地球科学学院，江西南昌 330013)

以南昌市区为例，利用土地利用、社会经济数据，从水平、结构、密度等方面构建了半城市化地区空间范围识别指标体系，结合距离衰减理论和“断裂点”方法，界定了2013年南昌市区半城市化地区的空间范围。研究结果表明：(1)建设用地占比指标与景观紊乱度指标半城市化地区分布情况相似，面积分别为155.00 km2和260.25 km2，主要分布在青山湖区、红谷滩新区和湾里区；二三产从业人员指标与人口密度指标半城市化地区分布情况相似，面积分别为208.78 km2和227.48 km2，主要分布在青山湖区、青云谱区和红谷滩新区。(2)南昌市半城市化地区总面积为67.32 km2，以12块独立的、间断的片状区域分布于城区外围，而并非是闭合的环状形态，其中70%以上的面积分布在青山湖区，2/3的区块位于赣江北岸。(3)城市化地区相邻单位网格内各指标值较为连续、平稳，区域内发展健康、均衡；半城市化区域内各指标值起伏变化大，值域范围广，区域内发展无序、不均衡。

半城市化地区；空间范围识别；断裂点方法；南昌市

Abstract： According to the data of land use, society and economy in Nanchang city, we constructed an index system for the recognition of spatial scope of semi-urbanized regions in Nanchang city from the aspects of level, structure and density, and defined the spatial scope of semi-urbanized regions in this city in 2013 by using the distance-decay theory and the “breakpoint” method. The results showed that: (1) Based on the index of construction land proportion, the area of semi-urbanized regions in Nanchang city was 155.00 km2, and it was distributed mainly in Qingshanhu, Honggutan and Wanli districts; according to the index of landscape disorder degree, the area of semi-urbanized regions in Nanchang city was 260.25 km2, and its distribution was similar to that of the former index. Based on the index of secondary and tertiary industrial employee (or population density), the area of semi-urbanized regions in this city was 208.78 km2(or 227.48 km2), and they all were distributed mainly in Qingshanhu, Qingyunpu, and Honggutan districts. (2) The total area of semi-urbanized regions in Nanchang was about 67.32 km2, which consisted of 12 independent and intermittent sheet-shaped blocks and were distributed around the urban area; more than 70% of semi-urbanized area was distributed in Qingshanhu district, and its 2/3 blocks were located at the north bank of the Ganjiang River. (3) In the urbanized area, the value of various indexes within the adjacent unit grids was relatively continuous and stable, indicating the regional development was healthy and balanced. But in the semi-urbanized region, the value of various indexes had a big fluctuation and a wide range, suggesting the regional development was disordered and unbalanced.

Keywords： Semi-urbanized region; Recognition of spatial scope; Breakpoint method; Nanchang