[Research progress on the differences and connections between supply and demand of urban green space]

As an important concept connecting urban green space (UGS) with the residents' demands, supply and demand of UGS is an important part of UGS research and planning. Identifying the difference and connection between UGS supply and demand contributes to proper configuration of UGS, human well-being improvement and urban sustainability. We reviewed literature on UGS supply and demand from 2016 to 2020, summarized common research topics and paradigms, examined associations among these topics, and proposed suggestions for future studies. We found that most studies focused on either USG supply or demand, and rarely analyzed match between UGS supply and demand. The studies of UGS supply mainly focused on the spatial and temporal patterns and the ecosystem services they provided, while the studies of demand focused on residents' subjective preference and behavior. Studies on supply and demand often differ in research objects, scales, and indicators, which was a major obstacle to construct relationships between them. We proposed that future studies should focus on the match of supply and demand. A possible way to achieve this goal is to measure UGS demand by both objective indicators and subjective preference.