地铁建设计划被“搁浅”，种种因素之外还有一笔生态账

Core Viewpoint - The recent suspension of subway planning in cities like Ningbo and Luoyang indicates a shift in China's urban subway construction from large-scale expansion to a focus on quality improvement [1] Group 1: Current State of Subway Construction - Subways have been regarded as a "core business card" for urban modernization, leading to aggressive planning and construction by various cities [1] - Many cities struggle to meet the national requirement of 0.7 passengers per kilometer per day, indicating a misalignment between planning and actual usage [1] - Current subway planning often prioritizes population size and real estate development over ecological and environmental considerations [1] Group 2: Need for Quality Development - There is a pressing need for subway construction to transition from "scale priority" to high-quality development, incorporating ecological and environmental factors [1] - A comprehensive evaluation system should be established, integrating passenger flow intensity, fiscal sustainability, and ecological carrying capacity [1] Group 3: Environmental Impact and Challenges - Subway construction disturbs approximately 100,000 cubic meters of soil per kilometer, which can damage underground water layers and soil ecosystems [2] - Instances of ground subsidence due to subway construction have been reported, with repair periods potentially lasting up to 20 years [2] - The ecological damage caused by subway construction is often irreversible, highlighting the need for a more sustainable approach [2] Group 4: Recommendations for Improvement - An improved environmental impact assessment system should include core indicators such as underground resource capacity and geological stability [2][3] - An "ecological indicator veto" mechanism is recommended, where projects failing to meet ecological standards would not be approved [3] - A green construction system should be established, incorporating costs for soil disposal and ecological restoration into total project investments, promoting the use of eco-friendly construction technologies [3]