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Outline
Based on the land use data, natural socio-economic data and carbon emission data of the main urban area of Chongqing, the land use transfer matrix and the PLUS (Patching-generating Land Use Simulation) model were used to analyze the spatial evolution characteristics of urban expansion in the main urban area of Chongqing from 2000 to 2020. The development scenarios of the natural state, urban expansion and ecological protection in 2030 were simulated under the influence of endogenous driving factors. The response relationship between land use change and carbon emissions in the study area from 2019 to 2022 was analyzed based on the Generalized Additive Model (GAM), and the total carbon emissions under the three scenarios were calculated. From 2000 to 2020, the cultivated land in the study area decreased by 928.82km2, while the construction land increased by 858.30km2. A large amount of cultivated land was transferred to the construction land, and water areas, forest land and grassland underwent in a certain degree of dynamic change. Urban expansion is influenced by a combination of natural and socio-economic factors, with the main driving factors including elevation, distance from water areas and distance from Grade 1roads. External policy-driven factors also have a significant impact on urban expansion. From 2020 to 2030, the main urban area of Chongqing will continue to experience in a rapid urbanization process. The direction of urban expansion will mainly be eastward and westward, while the expansion direction of forest land and grassland will be opposite to that of urban expansion. The impact of changes in land use structure on carbon emissions is mostly nonlinear, and there may be potential threshold areas. Forest land, water and cultivated land show non-linear relationships, while grassland and construction land show linear relationships. Based on the land use structure of three scenarios in the study area in 2030, it is estimated that the carbon emissions of the land use structure in study area of Chongqing in 2030 will be 59.2995million tons of C/a, 62.0677million tons of C/a, and 58.2041million tons of C/a respectively.
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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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