城市绿地对热岛效应的调控功能研究——以广州为例  

Urban thermal island regulated by green spaces——A case study of Guangzhou

作　　者：王刚[1,2,3] 张秋平[4] 肖荣波 管东生[3] WANG Gang;ZHANG Qiuping;XIAO Rongbo;GUAN Dongsheng(School of Management, Guangdong University of Technology, Guangzhou 510520, China;Guangdong Provincial Academy of Environmental Science, Guangzhou 510045, China;School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;School of life science, Sun Yat-sen University, Guangzhou 510275, China)

机构地区：[1]广东工业大学管理学院,广州510520 [2]广东省环境科学研究院,广州510045 [3]中山大学环境科学与工程学院,广州510275 [4]中山大学生命科学学院,广州510275

出　　处：《生态科学》2017年第1期170-176,共7页Ecological Science

基　　金：国家自然科学基金项目(31470703);国家自然科学基金项目(51039007);"十二五"国家科技支撑计划重点项目(2012BAC13B01)

摘　　要：以Landsat 8为数据源,基于遥感和GIS技术研究了植被覆盖度、归一化湿度指数(NDMI)、以及绿地形态结构(包括周长、面积和周长面积比等)对绿地内部及其周边地表温度的影响。结果表明:植被覆盖度、NDMI与地表温度之间具有较显著的负相关性;城市绿地对周边区域具有明显的降温作用,但距离城市绿地边缘超过400~500 m之后,地表温度的下降趋势明显减弱;城市绿地面积、周长均与累计降温幅度间呈现显著的正相关性,即增加城市绿地面积与周长可以提高绿地对周边地表温度的调控作用;总体上,城市绿地对应的地表温度与公园面积、边界长度呈负相关,与周长面积比呈正相关,具有较好非线性拟合关系,说明绿地形态结构对地表温度调控功能的影响不容忽视。Land surface temperature(LST),vegetation cover,normalized difference moisture index(NDMI),urban greenspaces were retrieved from Landsat-8using remote sensing and GIS techniques in Guangzhou.This paper focused on theirrelationships among LST,vegetation cover,NDMI and urban green-space structures(such as area,parameter and ratiosbetween parameter and area of urban green spaces).The result showed that there was significantly negative linear correlationbetween LST and vegetation cover,as well as LST negatively correlated with NDMI.It indicated that LST decreased withincreasing of vegetation cover and NDMI.It was noted that all urban green spaces could remarkably decreased LST aroundthese urban green spaces.Average LST of the buffer zone increased sharply with distance from these green-space borderlines.However,average LST of these more than400-500m buffer zones increased slightly and gradually with distance from thesegreen-space borderlines.Moreover,there were significantly positive correlations between temperature-lowering amplitudeand both the area and perimeter of urban green space.In other words,it was expected that LST would be negatively affected by increasing area and parameter of urban green spaces.Study on these relationships between structures and inside LST ofurban green spaces,showed that there were significantly negative relationships between inside LST and both the area andparameter of urban green space,but there were positive relationships between inside LST and ratio between parameter andarea of urban green space.

关 键 词：热岛效应 城市绿地 植被覆盖度 归一化湿度指数 广州 

分 类 号：P951[天文地球—自然地理学] X87[环境科学与工程—环境工程]