| 摘要: |
| 在全球气候变化的背景下，热岛效应成为城市面临
的重要挑战之一，但针对热岛自身组成和分布的时空异质性研
究还比较少。以南京主城区2017和2022年的热环境为例，
将热岛细分为多个独立的热屿(heat islets)，识别出不同的
时空变化类型，并探索城市绿地与热屿变化的相关性。结果表
明，破碎与融合是热屿时空变化的主要类型，其中破碎之后热
屿的热岛强度会明显降低，而融合类型则正好相反。破碎或融
合前后热屿的变化与其中绿地的变化有极显著的相关性。假
设其他因素一致的情况下，绿地面积每增加1.00hm2，热屿
面积会平均减少14.25hm2，热屿破碎后的数量会平均增加
1.86个；绿地面积每减少1.00hm2，就有平均1.51个热屿
融合在一起，热屿的面积也会平均增加3.89hm2。根据不同
热屿的特征进行针对性的绿地规划布局，能更加有效地降低热
岛强度。研究结果有望为缓解城市热岛效应提供新的研究和实
践思路。 |
| 关键词: 风景园林 城市热岛 热屿 时空变化 城市绿
地 破碎 融合 |
| DOI：10.19775/j.cla.2024.03.0119 |
| 投稿时间：2022-10-21修订日期：2023-05-18 |
| 基金项目:国家自然科学基金项目“当代城乡结合部自然-社
会双重作用下的景观修复机制与模式研究——以苏南地区为
例”(编号51878144)和“快速交通对城市近郊大型绿地生态
完整性的影响及对策研究”(编号50978054)共同资助 |
|
| Spatiotemporal Characteristics of Urban HeatIslets and Its Correlation with Urban Green Space:A Case Study of Central Nanjing |
| WEI Xiao,ZHUANG Xuntong,WANG Xiaojun |
| Abstract: |
| Under the context of global climate change, the urban heat
island effect has become one of the grant challenges in urban area.
However, there are few studies on the spatiotemporal heterogeneity
of the inner composition and distribution of heat islands. This study
takes the thermal environment of the main urban area of Nanjing in
2017 and 2022 as examples, divides the heat islands into multiple
independent heat islets, identifies different types of spatiotemporal
variation, and explores the correlation of urban green space with
heat islets heterogeneity. The results show that fragmentation and
mergence are the 2 main types of spatiotemporal variation of heat
islets, and the urban heat islands intensity of heat islets will decrease
obviously after fragmentation, while the merged islets have the
opposite trend. There is a significant correlation between the changes
of heat islets and urban green space. Assuming that all else being
equal, when green space increases by 1.00hm2, the mean area of
heat islet will decrease by 14.25hm2, and the number of heat islets
will increase by 1.86 on average. On the contrary, for every 1.00hm2
reduction in green space, an average of 1.51 heat islets will merge
together, and the mean area of heat islets will also increase by 3.89hm2.
It indicates that targeted green space planning and layout according to
the characteristics of different heat islets could efficiently reduce the
urban heat island intensity. This study is expected to provide novel
study and practical ideas for the mitigation of urban heat islands. |
| Key words: landscape architecture urban heat island heat islet spatiotemporal change urban green space fragmentation mergence |
