Optimizing Spatial Distribution of Urban Green Spaces by Balancing Supply and Demand for Ecosystem Services

Table 1

Standards and data used to evaluate ecosystem service models.

Function	Composition	Indicators	Data sources
Recreational function (daily life)	Capacity of recreational space	Recreational area and distance from street center	Landsat8 remote sensing (RS) image
	Recreational space flows	Number of residents visiting recreational space	Demographic data from the Hefei Civil Affairs Bureau
	The demand for recreational space	Distance of recreational area from street center and population density	Demographic data from the Hefei Civil Affairs Bureau
	Sustainable supply of recreational space	Carrying capacity minus flow is greater than or equal to zero: sustainable supply of recreational space; Carrying capacity minus flows is less than zero: unsustainable provision of recreational space	Landsat8 RS image; Demographic data from the Hefei Civil Affairs Bureau
	Supply and demand of recreational space	Flow minus demand is greater than or equal to zero: satisfy demand of recreational space; Flows minus demand is less than zero: not to satisfy demand for recreational space	Landsat8 RS image; Demographic data from the Hefei Civil Affairs Bureau
Air purification (SO2)	Air purification capacity	Maximum annual absorption of SO2 by vegetation	Reference [36]
	Air purification flows	Actual annual SO2 uptake by vegetation	Reference [37]
	Air purification demand	SO2 average concentration and population density of blocks	Monitoring data from the Hefei Environmental Protection Bureau
	Sustainable supply of air purification	Carrying capacity minus flows is greater than or equal to zero: sustainable supply of air purification; Carrying capacity minus flow is less than zero: unsustainable provision of air purification	Reference [36, 37]
	Supply-demand relationship of air purification	Flows minus demand is greater than or equal to zero: satisfy demand of air purification; Flows minus demand is less than zero: does not satisfy the demand for air purification	Reference [37], monitoring data from the Hefei Environmental Protection Bureau