Multi-Scale Assessment of the Coordination Mechanism Between Agricultural Resources and Environment and Regional Development: A Case Study of the Fujian-Taiwan Region in China

As a typical human–nature coupled region, the coordination between the agricultural resource–environment system and regional development in the Fujian-Taiwan region is crucial for sustainable development. However, the underlying mechanisms and scale heterogeneity of this relationship remain unclear. This study employed a comprehensive evaluation approach to assess Agricultural Resource and Environmental Carrying Capacity (ARECC) and Regional Development Level (RDL) in the Fujian-Taiwan region in 2010, 2015, and 2019. A Coupling Coordination Degree (CCD) model was used to quantify the coordination relationship, while a geographical detector was applied to identify influencing factors at multiple scales. The main findings are as follows: (1) ARECC in Fujian increased gradually (average value: 0.046 → 0.052 → 0.075), whereas Taiwan exhibited a decline followed by recovery (average value: 0.449 → 0.408 → 0.491), with overall levels remaining higher than those of Fujian. RDL in Fujian was generally higher than that in Taiwan (average value: 0.260 > 0.212), and the average growth rate of Taiwan’s counties and cities was lower than that of Fujian (10.42% < 16.62%). (2) Overall, Fujian maintained a comparatively balanced relationship between ARECC and RDL, with maladjustment occurring only in Nanping City. In contrast, Taiwan experienced a substantially higher degree of maladjustment, with 40.90% of its counties and cities falling into maladjusted categories. Spatially, CCD in Fujian displayed a gradient decline from Fuzhou toward the southern, northern, and western regions, while high- and low-value areas in Taiwan were interspersed. (3) The coupling coordination mechanism exhibited significant scale heterogeneity, and corresponding differentiated regulation strategies were proposed. These findings contribute to a deeper understanding of the coordination mechanisms between ARECC and RDL in the Fujian–Taiwan region and provide references for promoting cross-regional agricultural collaboration and sustainable development.