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Greening plants have carbon sequestration and oxygen release capacity,air purification and water conservation.Planting high carbon sink plants in the highway land area is one of the important measures to make the whole life cycle low-carbon.Determination of oxygen release capacity of carbon sequestration through 14 kinds of greening plants in Guangdong in northern Guangdong,the quantitative study of carbon sequestration and oxygen release ability of different plants and sorting,analysis of plant functional characteristics of the space of expressway service area,service area and study the plant carbon sequestration combination mode of different use requirements based on the results of this study.It lays a foundation for the research of the green road.