生态环境学报Issue(2)：252-261,10.
城市绿地对周边热环境影响遥感研究--以北京为例
Effect of urban green land on thermal environment of surroundings based on remote sensing:A case study in Beijing, China
摘要
Abstract
Urban green land (UGL) is one of the key factors that mitigate urban thermal environment effect. Not only in macro scale it has influence on urban weather condition, but also in the scale of community, it has direct impact on thermal environment of its surroundings. In this paper, from the view of landscape of UGL, we chose UGL in main urban zone as study target and buildings around them as bearing agent influenced by them. By employing remote sensing (RS) and geographic information system (GIS) technology, we analyzed dominant landscape feature parameters of UGL that impact thermal environment of buildings, and studied how far UGL could affect surrounding thermal environment and correlation between landscape coefficients of UGL and cooling range caused by UGL. First of all, we mapped 26 UGL patches artificially and extracted their neighbor buildings from TM image. Then, we retrieved canopy temperature of UGL and top roof temperature of buildings around UGL based on quantitative remote sensing theory, and computed UGL’s landscape information using GIS tools. Finally, spatial range that UGL affect its neighbor buildings’ thermal environment was inferred through both spatial statistic method and isotherm perimeter-temperature curve breakpoint method, and meanwhile, correlation between UGL’s temperature and its neighbor buildings’ temperature was explored. Studies showed that, at the scale of spatial resolution of 100 m, most UGL patches had a role in cooling effect on their surrounding buildings within 100 m range. All UGL patches over 0.5 km2 acted significant cooling effect on buildings near patches within 100 m, and the temperature drop ranged from 0.46 ℃ to 0.83 ℃, with average 0.72 ℃. Also UGL patches below 0.5 km2 with high fractional vegetation cover played a cooling role, while UGL patches below 0.5km2 with low fractional vegetation cover had no significant cooling effect. Anymore, UGL patches’ perimeter, area, shape index and fractional vegetation cover had no significant correlation with UGL’s cooling range on their surroundings. The results indicate that, no matter how much the area is, UGL patches have limited spatial influence on their surrounding thermal environment;and dispersive UGL distribution has better cooling effect on surroundings than intensive distribution. Our research reveals the spatial distance and temperature drop range that UGL affected on its surrounding buildings and the correlation between UGL’s landscape indexes and the temperature drop range caused by UGL, which could provide scientific basis for urban plan and environment assessment.关键词
城市绿地/建筑/热环境/遥感/景观参数Key words
urban green lands/buildings/thermal environment/remote sensing/landscape coefficients分类
社会科学引用本文复制引用
栾庆祖,叶彩华,刘勇洪,李书严,高燕虎..城市绿地对周边热环境影响遥感研究--以北京为例[J].生态环境学报,2014,(2):252-261,10.基金项目
国家自然科学基金项目（41175015）；气象行业公益性研究专项 （）
