| Due to the separation of land and road,the space along the railway line has caused a lot of negative space along the urban operating railway line to be ignored.It is urgent to control the high-quality urban transportation space.It is difficult to meet the requirements of urban ecological corridors(30-60m)in width,and the green space along the railway line fails to achieve the contribution of urban transportation green corridors under the dual carbon goal.Therefore,through a large number of investigations on the railway traffic corridors in the central urban area of ??Beijing,the open space along the three most important lines in the central urban area of ??Beijing(Jing-Qin line,Jing-Zhang line,and Beijing-Shanghai general-speed railway line)is selected as the research object.In order to take the urban space of 1 km outwards on both sides of the railway,by sorting out the stock of urban space resources,building a spatial database of railway traffic corridors based on GIS software,and based on the evaluation method of the quality of ecosystem service functions,select the adjustment services and cultural services.Six evaluation indicators(air purification,carbon fixation and oxygen release,sound absorption and noise reduction,rainwater management,temperature regulation,viewing and recreation)construct an evaluation model suitable for the service function of the open space ecosystem along the railway corridor.,Beijing-Zhangjiakou Line,Beijing-Shanghai Line Normal-speed Railway as an example for in-depth research.The study found that,first of all,the space stock along the railway traffic corridors in the central urban area of ? ? Beijing is divided into five categories(protection,reconstruction,reconstruction,renovation,and supplementation),of which the building reconstruction type is 869 square meters,and the overall reconstruction type is 6123 square meters.,the facility supplementary type is 1957 square meters,the environmental remediation type is 483 square meters,and the total stock space is 9432 square meters.The study found that the air purification capacity(supply value)of the open space ecosystem service function along the railway transportation corridor accounts for between 0.33% and 0.41% of the urban needs(demand value);the amount of oxygen that can be released in open space(supply value)accounts for The amount of oxygen inhaled by urban residents(demand value)is between 0.61-0.79%;the amount of carbon dioxide absorbed(supply value)in open space is between 0.72%-0.93% of the amount of carbon dioxide exhaled(demand value)by urban residents;after noise reduction in open space The environmental noise value(supply value)is between79-86 DB,which is 9-16 DB higher than the standard noise value(demand value)of70DB,which does not meet the requirements of railway traffic noise standards;road traffic noise is between 57-63 DB after noise reduction in open space Between the upper and lower limits of the noise standard value(demand value)of 60DB-3DB-3DB,the Beijing-Qindao Line and the Beijing-Zhangjiakou Line can meet the standard value requirements of road noise,while the Beijing-Shanghai general-speed railway line does not meet the requirements of the road noise standard;There are many squares and parks on both sides,and the coverage rate of the 500 m service radius can reach about 80%.The 500 m service radius of the parks and squares on both sides of the Beijing-Zhangjiakou Line and the Beijing-Shanghai General Speed ??Railway Line covers the road between 23% and 48%;The water volume(supply value)required for transpiration in open space is 111-173 times that of precipitation(demand value)within the scope of the railway research,and urban precipitation can be absorbed and digested by urban green space;-220,440-300,085 times the heat released by the cooling of the highest temperature in September,which can adjust the microclimate.Therefore,it is very necessary to improve the management of traffic space and rebuild a continuous linear green space system. |
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