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Ozone uptake by adult urban trees based on sap flow measurement

文献类型： 外文期刊

作者： Wang, Hua 1 ; Zhou, Weiqi 1 ; Wang, Xiaoke 1 ; Gao, Fuyuan 4 ; Zheng, Hua 1 ; Tong, Lei 1 ; Ouyang, Zhiyun 1 ;

作者机构： 1.Chinese Acad Sci, State Key Lab Urban & Reg Ecol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Inst Forestry & Pomol, Beijing 100093, Peoples R China

3.Univ Calif Davis, Dept Plant Sci, Davis, CA 95616 USA

4.Beijing Teaching Bot Garden, Beijing 100061, Peoples R China

关键词： urban trees;thermal dissipation method;canopy conductance;ozone;ozone flux;critical levels

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

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收录情况： SCI

摘要： The O_3 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 (F_(O_3)), 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 F_(O_3) 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 O_3 (G_(O_3)) took up more O_3 than those of low Go_3, but that their sensitivity to vapour pressure deficit (D) were also higher, and their Fo_3 decreased faster with increasing D, regardless of species. The responses of Fo_3 to D and total radiation led to the relative high flux of O3 uptake, indicating high ozone risk for urban tree species.

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