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Estimating Life-Cycle CO_2 Emissions from Freeway Greening Engineering

机译：估算高速公路绿化工程的生命周期CO_2排放

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Construction, operation, and maintenance of freeway subprojects (pavement, bridges, tunnels) have been included in the system boundary of life-cycle carbon dioxide (CO2) emissions. As an important subproject, greening engineering not only improves road environment but also offers benefits by absorbing some CO2, which could offset some emissions from the whole freeway life-cycle. However, previous studies rarely considered the influence of plants' absorption. To measure and evaluate freeway emissions comprehensively, life-cycle assessment was applied to the operation phase of greening Xihan Freeway. Collecting data on greening engineering completion and alteration plans, and calculating emissions by 34 tree and, 19 shrub species-on interchanges, roadsides, bridges-showed CO_2 sequestration by plants from greening engineering is 253.28 t/yr: greater at roadsides than at interchanges. Total sequestration accounts for 0.17% of transportation's CO_2 emissions. The findings could provide insights to decrease CO_2 emissions from freeway construction and management and enrich highway life-cycle environmental assessment content.
机译：高速公路子项目（人行道，桥梁，隧道）的建设，运营和维护已包含在生命周期二氧化碳（CO2）排放的系统范围内。作为重要的子项目，绿化工程不仅可以改善道路环境，而且还可以通过吸收一些二氧化碳而带来收益，二氧化碳可以抵消高速公路整个生命周期中的一些排放。但是，以前的研究很少考虑植物吸收的影响。为了全面测量和评估高速公路的排放，将生命周期评估应用于绿化西汉高速公路的运营阶段。收集有关绿化工程完工和改造计划的数据，并计算出34个树木和19种灌木物种的排放量（在立交，路边，桥梁处显示），表明绿化工程对植物的CO_2固存量为253.28吨/年：在路边比立交处要大。封存总量占交通运输CO_2排放的0.17％。这些发现可以为减少高速公路建设和管理中的CO_2排放并丰富高速公路生命周期环境评估内容提供见解。

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