With global warming and rapid urban development, the urban surface temperature in summer has been increasing, seriously affecting people’s work and life. The formation and changes in surface temperature are directly related to material surroundings and spatial functions. Urban construction has led to an increase in POIs (points of interest), and the POI represents the functional activity within the space to a certain extent. Therefore, this paper attempts to reproduce the process of the urban internal function development of Chengdu according to the distribution characteristics of different types of points of interest. It also delves into the influence of internal spatial functions on surface temperature in Chengdu. The results show that the surface heat values for all types of functions show a significant increase from 2009 to 2022. The rate of increase is particularly pronounced for public transportation, with temperatures increasing by an average of 0.317 °C per year. In addition, there are differences in the thermal contribution values of different functions. The residential and commercial functions have the most significant impact on surface temperature, with both accounting for more than 0.45 of all functional contribution values. Public transportation has a small thermal contribution value but shows a trend of doubling growth. The findings will provide some insights into the design of cooling in future urban planning.

Coordinating economic development with environmental protection has been a significant global challenge. Currently, China's rural revitalization is progressing rapidly. Adjusting and improving relevant indicators in the planning of rural collective commercial construction land based on the concept of carbon sink balance will contribute to climate and environmental improvement. This paper adopts a micro perspective, constructs carbon sink measurement indicators for the planning and design of rural collective commercial construction land before and after implementation, and utilizes the emission factor method for hypothesis testing. The study explores how controlling indicators such as green space can achieve carbon sink balance in planning and design. The conclusions of the study are as follows: under the existing urban green space regulations, the carbon sink of grassland in the original rural collective commercial construction land will increase by 656 t/hm 2 •a; for cultivated land, carbon sink balance requires the total green space and rooftop greening area to reach 50%; for forest land, the average green space rate of the entire collective commercial construction land must reach 40% to achieve balance. The study emphasizes the importance of carbon sink standard measurement of rural green space, which is helpful to low-carbon construction in rural areas.