Impact of Spatial Configuration of Urban Green Space and Urban Impervious Surface on Land Surface Temperature: A Multi-Grid Perspective

Abstract

Urbanization process has a huge impact on vegetation dynamics in urban ecosystems. Ecosystem services provided by urban green space have been increasingly incorporated into city-level measures to address climate change. Understanding the relationship between urban green space (UGS) and urban impervious surface (UIS) as well as land surface temperature (LST ) is crucial to the understanding of urban spatial morphology. To better understand the impact of different spatial configurations on the urban heat island effect at different scales, this study constructed the spatial configuration of UIS and UGS on four grids of different scales and explored their relationship with LST in sea- sonal changes. The results show that different indicators present significant characteristic disparity under the four grid scales, compared with other scales, indicators have a relative stability correlation at 1 km. In addition, trees and grass, as different urban green spaces, have notable negative effects on surface temperature. At grid 3 (G3) scale, grassland had a strong correlation with LST in aggregation index and landscape shape index, which were 0.473 and 0.648, suggesting that fine-scale planning is of great significance to alleviating the urban heat island effect. This study can assist in designing sustainable cities by providing insights into urban green space planning and management.