A Dynamic Evaluation of Ecosystem Services Value in the Beijing-Tianjin-Hebei Region Based on Scarcity Modification of Spatiotemporal Supply-Demand Influence

It is of great significance to study the spatiotemporal differences between supply and demand of regional ecosystem services (ES) and evaluate the dynamic impact of changes in supply and demand on the ecosystem services value (ESV) so as to provide scientific guidance for human activities and maintain healthy ecosystem development. This study proposes a novel method to calculate the scarcity value of ecosystem service (SESV) as a function of the temporal and spatial changes in supply and demand to divided ecological zones with differentiated land-use strategies. Then, it explores the changes in ESV and SESV in the Beijing-Tianjin-Hebei (BTH) region from 2000 to 2015. Firstly, the native ecosystem services value (NESV) and demand of ES in the BTH region were evaluated. Secondly, the spatiotemporal influence mechanism of supply and demand on ESV was analyzed according to the equilibrium price principle of supply and demand in economics, and a model for evaluating the SESV was constructed on the basis of supply and demand. Lastly, the ecological zoning method was proposed for of the BTH region. Result shows that the NESV in the BTH region was 2775.54 billion CNY in 2000, and it decreased to 2722.44 billion CNY in 2015. Taking into account the changes in supply and demand, the SESV in 2015 was 2884.85 billion CNY. Secondly, the NESV in 2000 and 2015 and the SESV in 2015 exhibited a gradual downward trend from north to south. Lastly, according to the changes in ecosystem service supply and demand and NESV/SESV in the BTH region, the ecological zones of the BTH region were divided, and differentiated land-use policies were put forward. The research can not only enrich ESV evaluation theories and methods, but also provide a scientific basis for the coordinated development of the BTH region and promote regional ecological civilization construction strategies.