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Detecting the spatial differentiation in settlement change rates during rapid urbanization in the Nanjing metropolitan region, China

机译:南京都市圈快速城市化过程中沉降变化率的空间差异检测

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摘要

Urbanization produced significant landscape changes throughout the world. China has been experiencing accelerated urbanization during the past decades. Rapid land use/land over conversion occurred nationwide in urbanization, manifesting noteworthy characteristics of landscape dynamics. In this study, we investigated the spatial differentiation in settlement change rates among 1-km~2 land units in the Nanjing metropolitan region, a representative rapidly urbanizing region in China. Remotely sensed detection using Landsat TM data of 1988-2006 showed that settlement increase, termed as positive growth (PG), was predominant in the study area; while settlement decrease, termed as negative growth (NG), also had a considerable proportion, which was mainly attributed to the increase of green lands and the shrink of rural settlements. Along the urban-rural gradient, PG and NG showedrnsimilar mono-peaked patterns. The urban fringe zone with a consistent width of about 4 km was identified as the hot zone of both PG and NG over the three unequal periods. For both PG and NG, high-rated changes tended to exhibit more aggregative patterns along the gradient in the urban fringe zone. Settlement changes showed apparent anisotropy across directions. The directional distribution of PG was significantly negatively correlated to the topographic variables, suggesting that the mountains constrained urban expansion in an "area-weighted inverse-distance power" form. Significant correlation between PG and NG in a time-lagged manner showed the "increase-decrease" fluctuation occurred in settlement changes, reflecting the "urban expansion-land reconfiguration" process in rapid urbanization in Nanjing.
机译:城市化在世界范围内产生了重大的景观变化。在过去的几十年中,中国一直在加速城市化进程。全国范围内的城市化进程中,土地使用迅速/土地过度转化发生在全国各地,表现出景观动态的显着特征。在这项研究中,我们调查了南京大都市区(中国具有代表性的快速城市化地区)的1 km〜2土地单位之间沉降变化率的空间差异。使用Landsat TM 1988-2006年的数据进行的遥感检测表明,在研究区域内沉降增加(被称为正增长(PG))是主要的;而定居点减少,也被称为负增长,也有相当大的比例,这主要归因于绿地的增加和农村定居点的减少。沿城乡梯度,PG和NG表现出相似的单峰格局。在三个不相等的时期内,宽度一致约4 km的城市边缘区被确定为PG和NG的热区。对于PG和NG而言,高速率的变化趋向于在城市边缘地区沿梯度表现出更多的聚集模式。沉降变化在各个方向上表现出明显的各向异性。 PG的方向分布与地形变量显着负相关,表明山脉以“区域加权反距离幂”形式限制了城市扩张。 PG与NG之间存在明显的时滞关系,表明居民点变化发生了“增减”波动,反映了南京快速城市化进程中的“城市扩张-土地重组”过程。

著录项

  • 来源
    《Environmental Monitoring and Assessment》 |2010年第4期|p.457-470|共14页
  • 作者单位

    School of Life Sciences, Nanjing University, 22 Hankou Road, Nanjing 210093, People's Republic of China;

    rnSchool of Life Sciences, Nanjing University, 22 Hankou Road, Nanjing 210093, People's Republic of China;

    rnSchool of Life Sciences, Nanjing University, 22 Hankou Road, Nanjing 210093, People's Republic of China;

    rnSchool of Life Sciences, Nanjing University, 22 Hankou Road, Nanjing 210093, People's Republic of China;

    rnSchool of Life Sciences, Nanjing University, 22 Hankou Road, Nanjing 210093, People's Republic of China School of Horticulture, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, People's Republic of China;

    rnSchool of Life Sciences, Nanjing University, 22 Hankou Road, Nanjing 210093, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    anisotropy; sector approach; urban-rural gradient; urban fringe zone;

    机译:各向异性部门方法;城乡梯度城市边缘区;

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