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- W2389672854 abstract "The objectives of this study were to(1) explore the temporal variations of CO2,SO2 and NO2 concentrations in near-surface(2.5 m above the ground) atmosphere,termed as pN-S(CO2),pN-S(SO2) and pN-S(NO2),respectively,and lead(Pb),chromium(Cr),stable carbon 13C and radiocarbon 14C concentrations in leaves of the tree Platanus acerifolia in environments with varying land covers and human activities,and(2) investigate whether 13C or 14C in plants can provide an indication of the atmospheric pollution in urban areas.A transect from the Nanjing urban center,across a suburban area to a forested area(urban forest) was selected as our study site(termed as urban-forest gradient in this paper).pN-S(CO2) was measured with sensors mounted on a moving vehicle,and pN-S(SO2) and pN-SNO2 were measured at selected,representative,sites along the transect in summer of 2008.Meanwhile,leaves of Platanus acerifolia along the transect were sampled,and Pb,Cr,13C,14C concentrations were measured.Results showed that pN-S(CO2),pN-S(SO2) and pN-S(NO2) were significantly negatively correlated with the distance to the urban center,with linear R2 values between 0.84 and 0.97.pN-S(CO2),pN-S(SO2) and pN-S(NO2) increased by as much as 7.3%,88% and 210%,respectively,from the urban forested area to the urban center.Heavy metal concentrations of Pb and Cr in leaves also were significantly negatively correlated with the distance to the urban center,with linear R2 values of 0.89 and 0.69,respectively.However,both 13C and 14C concentrations in leaves decreased along the forest-urban transect from forested area to the urban center,ranging from-27.9‰ to-31.4‰ and pMC from 95.8% to 101.2%,respectively.In other words,the contribution of fossil CO2 to the assimilated carbon in Platanus acerifolia leaves ranged from 9.3% to 14.4% along the forest-urban transect.Foliar 14C concentration was significantly correlated with each of the five commonly used parameters indicating the urban air pollution in this study,i.e.pN-S(CO2),pN-S(SO2) and pN-S(NO2) in air,and Pb and Cr concentrations in leaves,with R2 values of 0.94,0.92,0.88,0.92 and 0.58,respectively.Although there also existed negative relationships between δ13C and the five parameters,δ13C was significantly correlated with only two of the five parameters,viz.,pN-S(CO2) and Pb with R2 values of 0.74 and 0.67,respectively.It suggests that instead of stable carbon,radiocarbon concentration in urban plants is a good indication of the air pollution in urban environments." @default.
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- W2389672854 date "2010-01-01" @default.
- W2389672854 modified "2023-09-23" @default.
- W2389672854 title "Variation of carbon isotopic concentrations in tree leaves as an indication of urban air quality" @default.
- W2389672854 hasPublicationYear "2010" @default.
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