Modeling The Ability Of Roadside Vegetation And Wetlands To Sequester Carbon And Its Applications

The global warming caused by excessive use of fossil fuels and its harmful effect on the environment seriously affected the sustainable development of economy and society. In China, the carbon emission generated by transportation, which is second to energy industry, is considered as one of the major resources of carbon production. As an important unit of the transportation, highway system has been required to reduce its carbon emission urgently, but now it's still on early stage. Therefore, G42 Hu-ning Expressway was taken as an example to calculate and predict carbon sequestration of roadside vegetation and wetlands by using the methods of field work and models.By field investigation and literature review, dates and models are used to calculate the carbon storage of roadside vegetation. The carbon storage of arbor, shrubs and herbs is 73,24 and 0.163 thousand ton per year. And then, the clustering analysis of carbon storage in per unit area shows that Koelreuteria paniculata, weeping willow and gingko have better carbon storage in arbor, about 16.04?70 kg·m-2, as well as oleander, fructus forsythia and primrose jasmine in shrubs, about 12.02?13.95 kg·m-2.The SOC in different depth and biomass of different wetland plants were measured through field and lab work, the result shows the carbon storage of soil is 5287.5 ton, and the carbon sequestration of wetland plant is 152.5 ton per year. The SOC of lake type, freshwater marsh and pond in autumn is 12.52,7.47 and 7.55 g/kg, higher than the other season. In freshwater marsh, soil in water fluctuating band system has higher SOC(7.17 g/kg) than soil(6.21 g/kg) under water and dry soil(5.44 g/kg) on the bank. The soil under the community of thalia dealbata, Phragmites and cattail has higher capacity to sequester carbon, which is 9.31?7.64 and 6.85 g/kg, higher than bare flat(4.20 g/kg). Location is another factor affecting SOC, Wuxi(7.73 g/kg)>Suchow(6.60 g/kg)?Changzhou(6.61 g/kg)>Zhenjiang(6.40 g/kg) >Nanjing(5.42 g/kg), basically the same as the changes of the traffic and carbon emissions.Considering the influence of vertical multi-layer configuration and wetland water fluctuating band, the correction model used to calculate the carbon storage of roadside vegetation and wetland is established. After amendment, the result indicates that the roadside vegetation has the capacity of 114 thousand ton per year, the wetlands has the capacity of 6853.9 ton. In order to improve the ability of carbon sequestration, measures such as planting high carbon fixation species, strengthening the management of wetland and building roadside farm will be taken.The survey statistics and calculation method used in this research will provide helpful reference for carbon sequestration management in highway operation period.