西北林学院学报2017，Vol.32Issue(3)：198-204,210,8.DOI:10.3969/j.issn.1001-7461.2017.03.37
不同地表覆盖类型对城市地表热环境的调节
Regulation Function of Different Surface Cover Types to Urban Surface Thermal Environment
摘要
Abstract
Based on Landsat TM images,the main urban areas within the "High-speed Ring Road" in Nanning were used as the research objects,land surface temperature (LST) of Nanning was retrieved.Indices such as normalized difference vegetation index (NDVI),modified normalized difference water index (MNDWI),normalized difference built-up index (NDBI) were derived.The land cover types of the study area were divided into four types:waters,forest land,garden land,and construction land by maximum likelihood classification method.The area proportion of each land cover type in small area and average surface temperature of small area were counted by using the spatial analysis function of GIS,and the correlation analysis was investigated between area proportion of the four kinds of land cover types and average land surface temperature.Quantitative study on the relationship between the surface temperature and the type of land cover from the two scales of the pixel and the small area.The results showed that at the pixel scale,the average surface temperature was in the order of construction land＞garden land＞forest land＞water body.The LST had significant linear relationships with NDBI,and had nonlinear relationships with NDVI and MNDWI,but significant linear relationships with positive NDVI and positive MNDWI.In small regional scale,the average surface temperature could be as high as 33.2℃,which was mainly based on construction land,the average surface temperature was 27.8℃,which was mainly based on water body and green land.Area proportion of water body,forest land,and garden land all had negative correlation to the average surface temperature in small areas,and area proportion of construction land showed significantly positive correlation to average surface temperature in small areas.So it was concluded that different surface cover types had different effects on the surface temperature,green land and water body had the effect of cooling and the cooling effect of green land was better than that of the water body.Therefore,in order to achieve the purpose of regulating the surface thermal environment and the heat island effect could be alleviated by adding water and green land in the urban planning process.关键词
地表覆盖类型/地表温度/像元/小区域/南宁市Key words
land cover type/land surface temperature/pixel/small area/Nanning分类
农业科技引用本文复制引用
李倩,吴英,毛双双..不同地表覆盖类型对城市地表热环境的调节[J].西北林学院学报,2017,32(3):198-204,210,8.基金项目
广西自然科学基金(2012GXNSFAA053053). （2012GXNSFAA053053）
