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Outline
The National Key Ecological Function Zone Policy is an important part of China's ecological governance system, but whether it promoted county-level green economic growth remained unclear. Using county panel data for 2005~2020, the policy's impact on green economic growth was analyzed with a difference-in-differences design and machine-learning methods. The results show that the policysignificantly increased county green economic growth by 2.77%. Mechanism analyses indicated that the policy raised the value of ecosystem services by 6.59%, increased transfer payments by 11.71%, enhanced green technological innovation by 1.63%, and reduced the number of moderately polluting firms by 11.72%. The economic structure was further modernized. The heterogeneity analysis showed that the overall policy effect was stronger in western regions. Machine learning results show that the promotion effect was weaker where the welfare base was stronger, the fiscal burden was heavier, and the functional zone covered a larger area. These findings help us better understand how the policy promotes green economic growth and its shortcomings. The results provide useful reference for improving the policy according to local conditions and further promoting regional green economic growth.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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