Article ID Journal Published Year Pages File Type
4424982 Environmental Pollution 2012 12 Pages PDF
Abstract

The O3 uptake in 17 adult trees of six urban species was evaluated by the sap flow-based approach under free atmospheric conditions. The results showed very large species differences in ground area scaled whole-tree ozone uptake (FO3FO3), with estimates ranging from 0.61 ± 0.07 nmol m−2 s−1 in Robinia pseudoacacia to 4.80 ± 1.04 nmol m−2 s−1 in Magnolia liliiflora  . However, average FO3FO3 by deciduous foliages was not significantly higher than that by evergreen ones (3.13 vs 2.21 nmol m−2 s−1, p = 0.160). Species of high canopy conductance for O3 (GO3GO3) took up more O3 than those of low GO3GO3, but that their sensitivity to vapour pressure deficit (D  ) were also higher, and their FO3FO3 decreased faster with increasing D  , regardless of species. The responses of FO3FO3 to D and total radiation led to the relative high flux of O3 uptake, indicating high ozone risk for urban tree species.

► O3 uptake by urban trees varied considering contrasting species and study period. ►The responses of GO3GO3 to microclimate lead to relative high O3 uptake by urban trees. ►Many urban species are susceptible to O3 damage. ►The annual O3 uptake in our study is greatly less than that from modeling approaches. ►The difference suggests considering the species-specific flux in O3 risk assessment.

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Life Sciences Environmental Science Environmental Chemistry
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