Comparative Study On Carbon Emissions Of Road Infrastructure And Carbon Sequestration Capacity Of Different Configurations Of Green Space Systems

At present,global warming and its huge harm have seriously affected the sustainable development of economy and society,and alleviating climate warming has become a hot issue concerned by the international community.Roads are the arteries of urban traffic and are related to the civilization and healthy development of cities.However,the construction of road infrastructure consumes a large amount of building materials and energy,and is a large carbon emitter with great potential for emission reduction.Therefore,it is of great significance to carry out research on carbon emissions from road infrastructure construction and its reduction countermeasures to achieve the goal of carbon neutrality.Taking a municipal road in Shenyang City,Liaoning Province as an example,this paper determines the system boundary of the whole life cycle carbon emission evaluation of urban road infrastructure construction according to the theory of life cycle assessment method,and analyzes the carbon emissions of building materials mining,production and processing and mechanical construction energy consumption.Conduct research and analysis on the emission inventory,establish a carbon emission model for the whole life cycle of the road,and quantify the carbon emission in different stages;on this basis,calculate the carbon sequestration ability of different configurations of road green space systems and the selection of different green space plants.Through the analysis and research,the main results and conclusions of the paper are as follows:(1)The total life cycle carbon emissions of road infrastructure construction is12680 t CO2-eq,and the carbon emissions at different stages vary greatly.The order of carbon emissions in each stage is: building materials production and processing stage > operation and maintenance stage > construction and construction stage > waste removal stage,which are8670 t CO2-eq,3599 t CO2-eq,354 t CO2-eq and 57 t CO2-eq,respectively.(2)There are significant differences in the carbon sequestration capacity of different representative trees,shrubs and ground cover plants in the road green space in Shenyang.The carbon sequestration capacity of trees is: Ginkgo biloba L.> Populus alba × P.Berolinensis;Plant carbon sequestration capacity: Syringa oblata Lindl.> Amygdalus triloba(Lindl.)Ricker.(3)Different plants in the road green space system have different carbon sequestration capacities.In general,the carbon sequestration ability of compound plant configuration is higher than that of single type plant configuration.Specifically,the carbon sequestration ability of arbor,shrub and grass plant configuration is the strongest.Among them,arbor and grass>arbor shrub>shrub grass>arbor grass>single shrub >Single tree >Single ground cover.(4)Different plant configuration modes of the road green space system have different effects on offsetting the carbon emissions in the whole life cycle of road infrastructure construction.Under the tree-shrub-grass plant configuration,the combination of Ginkgo biloba L.+ Amygdalus triloba(Lindl.)Ricker + Spiraea japonica ’Gold Mound’ has the shortest time to offset the carbon emissions in the whole life cycle of road infrastructure construction,which is 37.55a;under the single ground cover configuration mode,bluegrass offsets The carbon emission time of road infrastructure construction is the longest,which is245.58 a.To sum up,the carbon emission of road infrastructure is mainly in the production and processing stage of building materials.Under the configuration mode of arbor,shrub and grass,the carbon sequestration capacity is the best.Among them,Ginkgo biloba + Elm Leaf Plum + Jinshan Spiraea green space plants select the annual carbon sequestration capacity.At most,it is recommended to choose the combination of Ginkgo biloba L.+ Amygdalus triloba(Lindl.)Ricker + Spiraea japonica ’Gold Mound’ as the configuration of the green space system.According to this configuration combined with the carbon emissions in the life cycle of road infrastructure,it is estimated that about 37.55 a can offset the carbon emissions in the life cycle of road infrastructure.