【摘要】 为了明确南昌市城市绿色空间对城市热岛效应的调节效应与驱动因素,刻画典型绿地的有效降温范围,并提出面向规划实践的优化策略。以南昌市为研究对象,基于Landsat系列遥感数据,结合大气校正法反演地表温度和最大似然法等提取不同时段绿色空间及热特征。结果表明:1)2005—2024年,南昌市城市绿色空间面积减少1 754.7 km~2,占比下降24.34%,高温区与特高温区的绿色空间显著减少;2)绿色空间整体温度低于周边建成区,冷岛与低温区常年占比90%以上,具备明显降温作用;3)样本公园的有效降温距离为150～350 m,降温幅度在0～50 m内最为显著,且大部分公园距绿地越远温度逐渐升高。从宏观优化绿蓝通风格局、中观织补阴影透水冷链与监测养护应急服务闭环三方面提出绿色空间优化策略,为南昌市应对城市热岛效应提供了数据支撑与理论依据。更多还原

【Abstract】 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 typical green spaces and propose planning-oriented optimization strategies, Nanchang was selected 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 km~2, representing a reduction of 24.34%, with a significant loss of green spaces in high-and extremely high-temperature zones; 2)urban green spaces consistently exhibited lower temperatures 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 urban heat island effect in Nanchang.更多还原