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As China enters the middle stage of industrialization and modernization, both energy consumption and carbon emissions are growing, posing an increasingly serious challenge to sustainable development. The industrial sector is a major source of carbon emissions, and its structural optimization is crucial for reducing carbon emission intensity. Based on a sample of 30 provinces in China from 2005 to 2021, a dynamic panel threshold regression model was applied to treat provincial cooperation as a threshold value, and the mechanism of industrial structure optimization on carbon emission intensity was explored from two dimensions: rationalization and advancement of industrial structure. The results show that the rationalization and upgrading of the industrial structure have a significant negative impact on carbon emission intensity. However, the rationalization of industrial structure has a significant three-threshold effect on carbon emission intensity, and this negative effect shows a “V” type change trend on the whole. The upgrading of industrial structure has a single threshold effect on carbon emission intensity. The upgrading of the industrial structure will significantly promote the reduction of carbon emission intensity only when the provincial cooperation index is at least 2.013. The government should actively establish a cross-provincial cooperation mechanism to foster the coordinated development of inter-provincial industries and facilitate the extensive sharing of clean energy technologies, thereby promoting the transformation of the economy towards a green and low-carbon future.
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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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