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This study employs prevalent international statistical standards to categorize urban rail transit into three types: metro, light rail, and tram. It presents a comprehensive statistical analysis of the current state of urban rail transit systems across the globe. As of the close of 2023, urban rail transit systems have been established in 563 cities spanning 79 countries and regions, with a cumulative track length exceeding 43,400.40 km. Subways, light rails, and streetcars account for 50.07%, 10.69%, and 39.24% of the total length, respectively. Notably, as of December 31, 2023, 66 cities in China (including Hong Kong, Macao, and Taiwan) have commenced rail transit operations, boasting a combined operational track length of 11,900.29 km, with Chinese mainland alone contributing 11,232.65 km to this total. In 2022, the metro systems in 183 cities across 59 countries globally handled a total of 58,652 million trips of passengers, representing an average ridership intensity of 0.81 trips per day per kilometer. Specifically, China's metro systems (including those of Hong Kong, Macao, and Taiwan) registered an annual passenger traffic volume of 21.251 billion trips. The study underscores the steadfast advancement of China's urban rail transit systems, which consistently lead the world in both network scale and passenger traffic. Through an indepth analysis of data subsequent to the release of Document 52 by the State Council, this study anticipates a resurgence of lowcapacity urban rail transit systems, particularly streetcars, in Chinese mainland, especially in the central and western regions, in a bid to drive environmentally sustainable urban development. Further, by drawing on data from major countries and cities worldwide, both preand postpandemic, the study predicts a return of passenger traffic in Chinese mainland to prepandemic levels by 2024-2025.
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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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