Rapid urbanization and global warming have exacerbated the deterioration of the urban thermal environment and its adverse effects. Urban spatial pattern, as an important approach to regulating the urban thermal environment, has increasingly drawn academic attention for its influence on land surface temperature (LST). Although numerous studies in this field, quantitative research on the comprehensive effects and nonlinear interactions of 2D/3D building and green space morphology on LST remains scarce, particularly from urban functional zones (UFZs) perspective. Therefore, this research took Shanghai as a case study and utilized multi-source datasets, such as building outlines, green space distribution, and canopy height, to quantify the combined and interactive effects of building and green space morphology on LST across various UFZs, applying the XGBoost-SHAP model. The results indicated that (1) LST varied with UFZs. Biophysical parameters and building morphology accounted for a greater proportion of the effects on LST. The main factors influencing LST differed significantly across distinct UFZs, but showed some similar laws. (2) Within different UFZs, the influence of the dominant factors on LST showed significant spatial differences and threshold effects. Among them, BCR was the main warming factor, with thresholds of 24.64 %, 36.25 %, 23.22 %, and 33.64 % respectively in residential, commercial, public service, and industrial zones. Conversely, NDVI was the primary cooling factor with thresholds of 0.35, 0.23, 0.37, and 0.29, respectively. (3) The LST in different UFZs was affected by the interaction between building and green space morphology metrics. The synergistic interaction between high FAR and high BCR contributed to the reduction of LST in residential and commercial zones. In areas with high BCR, the cooling effects could be achieved in the commercial zone (when BH_SD was <15 m), in public service zone (when MTH was <3 m), and industrial zone (when NDVI and BSA was both greater than 0.2, and MBH exceeded 10 m). Our research findings can provide more targeted scientific evidence and decision support for the pattern optimization and planning design of buildings and green spaces aimed at improving the urban thermal environment.
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