Ecological Space Optimization in River Basin City Based on Ecosystem Service Supply and Demand:A Case Study of Jing Country Section of Qingyi River Basin
In the rapid urbanization phase,the demand for ecosystem service in river basin cities has been increasing,exacerbating the imbalance between ecosystem service supply and demand.Clarifying and optimizing the ecosystem service supply-demand relationship in river basin cities is of great significance for achieving synergies between regional ecological conservation and economic development.Taking Jing County,traversed by Qingyi River,the largest tributary of the lower Yangtze River,as an example,this study applied an ecosystem service spatial quantitative assessment method to measure six key ecosystem services supply-demand levels:carbon sequestration and oxygen release,rainwater retention,soil conservation,biodiversity,food production,and recreational activities.By using the quadrant model,the ecosystem service supply-demand relationship was determined,and the region was classified into three categories:balance,deficit,and surplus.With the goal of supply-demand balance,land-use scenario was set based on the strategy of"conserving balanced and deficit areas while developing surplus areas".The CA-Markov model was employed to obtain the ecological spatial layout under supply-demand constraint The results indicate:1)The distribution of ecosystem service supply relies on high-quality ecological elements and shows a trend of being higher in the south and lower in the north.The distribution of ecosystem service demand aligns relatively well with areas of human activity,particularly in the central and southern parts of the county.2)The overall ecosystem service supply-demand relationship is relatively balanced,with the largest proportion in the balanced category,followed by the surplus category,and a smaller proportion in the deficit category.3)The supply-demand constraint scenario demonstrates a favorable transition from non-ecological to ecological space,allowing for an expansion of important ecological resources such as forests,water bodies,and grasslands.It also maintains the integrity of large ecological patches and guides urban areas towards compactness.4)The designated ecological conservation space and ecological conservation red line based on the supply-demand relationship align well in the balanced area.However,in the surplus and deficit areas,the latter exhibits a control gap known as the"skylight"phenomenon,leading to fragmentation in Qingyi River,which has not been observed in the former.
landscape architectureecosystem service supply and demandriver basin cityecological spacescenario simulationQingyi River
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