Reallocation planning of urban industrial land for structure optimization and emission reduction: A practical analysis of urban agglomeration in China's Yangtze River Delta

Urban industrial land has gradually become a scarcity affecting production, and the reallocation planning of industrial land is an important tool with which to guide the sustainable development of urban industrial manufacturing. To save energy and ensure the economic benefits of industrial production, we designed a reallocation planning model for urban industrial land. The planning model takes the cost of industrial land development, the investment intensity of unit land fixed assets and planning density as the main planning indices and combines the tax differences for different energy consumption intensity industries and the heterogeneity of the enterprise's decision of spatial location. The reallocation strategy of the model is simulated according to the Yangtze River Delta Urban Agglomerations of China. The characteristics of industrial land reallocation planning and its impact on industrial structure optimization and emission reduction are analyzed. The results show that the position adjustment of industrial parks during planning will lead to ladder-type spatial characteristics of planning indices through enterprises' decision heterogeneity. The differences in tax intensity for industries with different energy consumption intensities have little influence on indices' spatial characteristics and have no significant impact on the structural characteristics of the industrial land development cost except for large size enterprises. The role of urban industrial land reallocation planning in the process of urban industrial structure optimization has been better reflected under indifferent tax policies, which will also have a significant effect on reducing regional industrial carbon emissions and optimizing the spatial pattern of regional industrial carbon emissions. In China's Yangtze River Delta Urban Agglomerations, cities with large areas of industrial land should make full use of the role of the industrial park's position adjustment in urban industrial land reallocation planning to optimize the urban industrial structure. Cities with small scale industrial land should pay attention to the decision heterogeneity of enterprises in the planning process. Industrial tax policy and land use planning should be combined to make full use of the contribution of industrial land reallocation to regional carbon emission reduction.