南昌市城市绿色空间对城市热岛效应的影响研究OA

To clarify the regulatory effects and driving factors of urban green spaces(UGS)on the urban heat island(UHI)effect in Nanchang,delineate the effective cooling range of typi-cal green spaces and propose planning-oriented optimization strategies,Nanchang was se-lected as the study area.Multi-temporal Landsat series remote sensing data were used to retrieve land surface temperature based on the atmospheric correction method,while the maximum likelihood classification and related approaches were applied to extract green space distribution and thermal characteristics across different periods.The results show that:1)from 2005 to 2024,the total area of urban green spaces in Nanchang decreased by 1 754.7 km2,representing a reduction of 24.34%,with a significant loss of green spaces in high-and ex-tremely high-temperature zones;2)urban green spaces consistently exhibited lower tem-peratures than adjacent built-up areas,with cold and low-temperature zones accounting for more than 90%annually,indicating a pronounced cooling effect;3)the effective cooling distance of sampled parks ranged from 150 to 350 m,with the most significant temperature reduction occurring within 0～50 m and temperatures generally increasing with distance from green spaces.Based on these findings,optimization strategies for urban green spaces are proposed at three levels:The macro scale(optimizing blue-green structures and ventilation corridors),the meso scale(integrating shading,permeable surfaces and cooling networks)and the management level(establishing monitoring,maintenance and heat-response service systems).These strategies provide data support and a theoretical basis for mitigating the ur-ban heat island effect in Nanchang.