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苏锡常地区聚落粒级结构特征及其演化

陆俊宇1,刘茂松1**,徐驰1,杨雪姣1,张艳1,张明娟2   

  1. 1南京大学生命科学学院, 南京 210093; 2南京农业大学园艺学院, 南京 210095)
  • 出版日期:2013-03-10 发布日期:2013-03-10

Characteristics and evolution of settlement size structure in Suzhou, Wuxi, and Changzhou area of East China.

LU Jun-yu1, LIU Mao-song1**, XU Chi1, YANG Xue-jiao1, ZHANG Yan1, ZHANG Ming-juan2   

  1. (1School of Life Sciences, Nanjing University, Nanjing 210093, China; 2College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China)
  • Online:2013-03-10 Published:2013-03-10

摘要:

利用1987、1993、1999、2005和2010年的Landsat遥感影像,提取江苏苏锡常地区3个地级市及9个县级市行政单元的聚落用地,并将聚落斑块按<5、5~20、20~80、80~320、320~1280、1280~5120、5120~20480和≥20480 hm2分为8个粒级,对各行政单元聚落粒级结构特征及其演化过程进行了比较。结果表明:1987—2010年,研究区聚落总体规模增长了约5倍,但不同区域聚落规模的变化过程存在一定的节律性差异;期间各单元聚落粒级数增长了1~2级,最低粒级聚落斑块的面积占比大幅减小,最高粒级聚落的面积占比逐渐增大;在地级市单元及部分县级市单元中,出现次高粒级面积占比较小甚至缺失现象;地级市单元聚落粒级结构的均衡度持续下降,而多数县级市单元聚落粒级结构的均衡度上升。比较均衡分布型与非均衡分布型行政单元的区位条件及单元内景观资源格局特征发现,域内资源分布格局应是影响聚落粒级结构特征及其演化趋势的重要原因。
 

关键词: 平欧杂种榛, 盐碱胁迫, 电阻抗图谱, 离子平衡

Abstract: By using the Landsat TM/ETM+ images acquired in 1987, 1993, 1999, 2005, and 2010, the spatial distribution patterns of the settlements in Suzhou, Wuxi, and Changzhou area (including 3 prefecturelevel units and 9 countylevel units) of East China were extracted, the settlement patches were classified into 8 size classes (<5, 5-20, 20-80, 80-320, 320-1280, 1280-5120, 5120-20480, and ≥20480 hm2), and the characteristics and evolution process of the settlement size structure in the prefecture and countylevel units were comparatively analyzed. In 1987-2010, the settlements in the study area expanded 5 times in size, but the settlement growth varied with administrative units, showing different growth rhythms. The settlement size class was promoted by 1-2 levels, with the proportion of the lowest size class decreased greatly while that of the highest size class increased continuously. In addition, the second-highest size class presented very small proportions (even 0) in 3 prefecture-level units and some countylevel units. The equilibrium distribution degree of the prefecture-level units decreased continuously, but that of most county-level units showed an increasing trend. The comparison of the location conditions of equilibrium and nonequilibrium distribution types administrative units and of the landscape resource patterns within the units showed that the resource distribution pattern should be the important factor affecting the settlement size structure and its evolution trend.

Key words: Ping’ou hybrid hazelnut, saltalkali stress, electrical impedance spectroscopy, ion balance.