基于2000年Landsat5 TM和2017年Landsat8 OLI_TIRS数据,利用辐射传输方程法反演南京市地表温度,结合景观格局指数进行热力景观格局演变分析,并使用多元线性回归分析了南京城市景观格局与热环境的关系。结果表明:2017年南京市热岛效应比2000年明显加剧,高温区范围大幅扩张,六合区、江宁区、浦口区热岛区域增长速度较快;热岛高温区斑块面积及连通性增加、破碎程度降低,其在热力景观格局中的优势度明显升高。南京市热力景观格局总体上破碎程度下降、斑块形状趋于规则化、聚集度升高、连通性增加。在快速城市化过程中,可以通过合理规划城市布局,适当增加城市绿地面积以缓解热岛效应。

In this study,Landsat5 TM(2000)and Landsat8 OLI_TIRS(2017)were used to derive land surface temperature based on radiative transfer equation,and the landscape pattern indices were calculated to analyze the evolution of the thermal landscape pattern in Nanjing.Then the relationship between urban landscape pattern and thermal environment was analyzed with mutiple linear regession model.The results showed that,from 2001 to 2014,the heat island effect was obviously enhanced,and the high temperature area of heat island increased substantially,and there was a higher growth in Liuhe,Jiangning and Pukou than that in other districts.The area and connectivity of heat island patch increased and the fragmentation decreased.The preponderance of heat island in the thermal landscape pattern increased.Generally,the fragmentation of thermal landscape in Nanjing was gradually reduced,and the patch shape was becoming regular,while the agglomeration and connectivity was increased.During the rapid urbanization process,the heat island effect can be mitigated by rational planning of urban layout and appropriately increasing the area of urban green space.