5.2 Innovation and advantages of the SCP model
The innovation of this study is the SCP model with vegetation coverage as the core. The model describes the difference between the soil erosion level in different regions at different times and the theoretical minimum soil erosion level, reflecting the extent of improvement and spatial difference of soil erosion control. And, it not only inherits the evaluation criteria of absolute quantity reduction commonly used in the evaluation system of SCE but also provides a theoretical basis for the investment of GFG. The greater SCP is, the greater the gap between the current situation of soil erosion and the ideal situation is, and the higher intensity of GFG should be. On the other hand, if the SCP is small, it indicates that the current situation of soil erosion is close to the ideal situation, and relatively low GFG investment should be given. The advantage of this approach is that corresponding GFG strategies can be developed for different regions to control costs and improve the effectiveness of governance and policy implementation. The proposal and application of this model provide the public with a further understanding of the relationship between the GFG and soil conservation and provide a new way of thinking for the optimization of GFG in the future.