The cooling and humidifying effects of urban aggregated green infrastructure can provide essential services for city ecosystems, regulating microclimates or mitigating the urban heat island effect. However, the optimal thresholds of plant community structure parameters for maximizing the associated cooling and humidifying effects remain unclear. In this paper, we use the method of dummy variable regression to measure plant communities in an urban aggregated green infrastructure. By examining the relationships between the cooling and humidifying effects and plant community structure parameters (i.e., canopy density, porosity, and vegetation type), we introduce optimal thresholds for the parameters. We find that canopy density has a significantly positive correlation with both cooling and humidifying effects, while porosity has a positive correlation with cooling and a negative one with humidifying. Different vegetation types have distinct influences on cooling and humidifying effects. When the canopy density is between 0.81 and 0.85 and the porosity is between 0.31 and 0.35, the cooling and humidifying effects of the plant communities reach their peak. Additionally, the greening coverage rate and spatial types of urban aggregated green infrastructure have influences on cooling and humidifying effects. The findings can help us to better understand the relationships between plant community structure parameters and their temperature regulation functioning for urban aggregated green infrastructure. This study provides guidelines and theoretical references for the plant configuration of future urban green spaces.

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This research aims to examine the changing process in urban renewal policy in Shenzhen, a typical precursor of China's land system, and explore its relationship with urban villages (informal spaces), which have been an important spatial feature of China's rapid urbanization. The results show that there are three important phases of urban planning policy change. In the first phase, a period of nationalization and dualistic urban space formation led by the government. In the second phase, developers accelerated urban renewal in the form of 'demolition and redevelopment.' In the third phase, public housing was complemented by low-cost living space and the transformation of urban villages into a significant trend of 'comprehensive renovation (zonghezhengzhi)' with the retention of buildings and renovation. As demonstrated by recent policy changes, preserving the diversity of urban space is instructive for urban development.