RESEARCH ON SUPPLY FAIRNESS EVALUATION AND OPTIMIZED LAYOUT OF URBAN GREEN SPACE IN XUZHOU QUANSHAN DISTRICT, CHINA

Abstract

. This study takes Xuzhou Quanshan District of China as the research object, firstly, the two-step floating catchment area method was used to evaluate the green space supply level; and then, Gini coefficient and Lorentz curve were used to evaluate the spatial distribution fairness of urban green space; finally, the optimization layout strategy was put forward in three stages. The results showed that: 1) the green space supply of different sub-district varies greatly, the supply level in the south is higher than that in the north. There are three sub-districts lower than the standard of 5.5 m 2 /person. 2) The average supply of green space in 453 residential areas is 12.66 m 2 /person, as many as 68.3% of the residential areas did not meet the 14.6 m 2 /person, of which 181 residential areas were less than 5.5 m 2 /person, accounting for 40.0% of the total. 3) The Gini coefficient of the distribution of green space in 453 residential areas has reached 0.3659, which is close to the warning level. 4) After the optimization layouts, a total of 243.792 hm 2 of green space was added. The residential-level Gini coefficient was reduced by 31.7% to 0.2499, meanwhile the Gini coefficient of each sub-district was less than 0.4.