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[Objective] The purpose of this paper is to systematically explore the optimized conversion paths and mechanisms between shrinking urban inefficient industrial land and green infrastructure, and to provide a reference for the intensive and efficient use of shrinking urban inefficient industrial land in China. [Methods] Taking Mudanjiang City, a typical shrinking city, as an example, this study selected the relevant data in 2021 and constructed an identification indicator system of inefficient industrial land use and a performance assessment indicator system of green infrastructure by analytic hierarchical process (AHP) analysis. It used the TOPSIS method for the quantitative evaluation of inefficient industrial land use, and used the ecosystem service value (ESV) correction coefficient method and Fragstats tool for the quantitative evaluation of green infrastructure performance. An optimization model of low-efficiency industrial land based on the performance improvement of green infrastructure was established, and the conversion mechanism of low-efficiency industrial land to green infrastructure was further revealed. [Results] (1) There are 160 land parcels in the state of inefficient utilization in the built-up area of Mudanjiang City (447.30 hm2 in total), accounting for 45.71% of the total number of industrial sites, while green infrastructure is 4950.37 hm2, accounting for 42.18% of the built-up area of the city, with the distribution decreasing from south to north. (2) With the help of the optimal utilization model of inefficient industrial land based on green infrastructure performance improvement, it was found that 303.80 hm2 of inefficient industrial land in Mudanjiang could be converted into green infrastructure. (3) After optimization simulation, 67.92% of in the low-efficiency industrial land is converted to green infrastructure, which leads to 10.18% improvement in the overall performance of green infrastructure. [Conclusion] Using the case of Mudanjiang City, it was empirically demonstrated that the conversion mechanism of low-efficiency industrial land in shrinking cities based on the improvement of green infrastructure performance can prevent inefficient industrial land use and improve the overall performance of green infrastructure. By preventing inefficient industrial land use from further negatively affecting urban development, it can promote the high-quality development of shrinking cities through “exchanging stock for increment”, and provide a reference for research related to the spatial optimization of shrinking cities. |
