Uptake of NO, NO2 and O3 by sunflower (Helianthus annuus L.) and tobacco plants (Nicotiana tabacum L.): dependence on stomatal conductivity

Atmospheric Environment. Part A. General Topics Pub Date : 1993-10-01 DOI:10.1016/0960-1686(93)90043-X

A. Neubert , D. Kley, J. Wildt, H.J. Segschneider, H. Förstel

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引用次数: 60

Abstract

The uptake of NO, NO₂ and O₃ by sunflowers (Helianthus annuus L. var. giganteus) and tobacco plants (Nicotiana tabacum L. var. Bel W3), using concentrations representative for moderately polluted air, has been determined by gas exchange experiments. Conductivities for these trace gases were measured at different light fluxes ranging from 820 μEm⁻²s⁻¹ to darkness. The conductivities to water vapor and the trace gases are highly correlated. It is concluded that the uptake of NO, NO₂ and O₃ by sunflowers and tobacco plants is linearly dependent on stomatal opening. While the uptake of NO is limited by the mesophyll resistance, the uptake of NO₂ is only by diffusion through the stomata. Loss processes by deposition to the leaf surfaces are more pronounced for O₃ than for NO and NO₂.

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向日葵和烟草对NO、NO2和O3的吸收:对气孔导电性的依赖

利用气体交换实验测定了向日葵(Helianthus annuus L. var. giganteus)和烟草(Nicotiana tabacum L. var. Bel W3)在中等污染空气浓度下对NO、NO2和O3的吸收。在820 μEm−2s−1到黑暗的不同光通量下测量了这些微量气体的电导率。对水蒸气和微量气体的电导率是高度相关的。综上所述，向日葵和烟草对NO、NO2和O3的吸收与气孔开度呈线性关系。对NO的吸收受叶肉抗性的限制，而对NO2的吸收仅通过气孔扩散。O3通过沉积到叶片表面的损失过程比NO和NO2更明显。

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Atmospheric Environment. Part A. General Topics

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