期刊
URBAN FORESTRY & URBAN GREENING
卷 55, 期 -, 页码 -出版社
ELSEVIER GMBH
DOI: 10.1016/j.ufug.2020.126838
关键词
Cooling effect intensity; Cooling range; Green spaces; Landscape metrics; Urban heat island; Water bodies
资金
- National Natural Science Foundation of China [71964002]
- Natural Science Foundation of Guangxi Province [2018GXNSFAA050040]
- Humanities and Social Science Fund of Ministry of Education of China [17YJCZH153]
- Scientific Research Foundation of Guangxi University [XGZ150300]
- Research Project of Taihu Lake Water Pollution Control of Jiangsu Province [TH2010301]
- Provincial Nature Science Foundation of Jiangsu, China [BK2011404]
- Soft Science Project of the Ministry of Housing and Urban-Rural Development of China [2013-R2-33]
- Soft Science Project of Jiangsu Province [BR2014061]
- State Key Exchange Program for Overseas High-level Experts
- University of California Agricultural Experiment Station
Urban green spaces and water bodies play major roles in effectively alleviating the urban heat island (UHI) effect by decreasing temperature. Here, statistical correlation and regression analyses were carried out to examine the relationships between metrics (vegetation coverage, water coverage, area, leaf area (LA), and patch shape index (PSI)) and land surface temperature (LST) or cooling effect intensity. Besides, the cooling ranges of green spaces and water bodies were explored by sampling and thresholds detection. Landsat satellite images were used to derive land cover map and LST map. Results show that: (1) average LST within given residential area decreases with the vegetation coverage and water coverage increasing; (2) area and LA are both significantly positively correlated with the cooling effect beneficial to people entering green spaces; (3) increasing the vegetation coverage in the range from approximately 0-28 % can effectively and economically alleviate the thermal environment of residential areas, and the economical optimal green space area and LA are both 0.26 ha; and (4) from 2010 to 2017, the cooling range of green spaces in the central districts of Nanjing is around between 180 and 810 m with the average value of 540 m, while the cooling range of water bodies ranges approximately from 510 to 1260 m with the average value of 840 m.
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