Leaf age affects the responses of foliar injury and gas exchange to tropospheric ozone in Prunus serotina seedlings.
作者： Jianwei Zhang , Marcus Schaub , Jonathan A. Ferdinand , John M. Skelly , Kim C. Steiner
DOI: 10.1016/J.ENVPOL.2010.05.003
关键词:
摘要: We investigated the effect of leaf age on response net photosynthesis (A), stomatal conductance (g(wv)), foliar injury, and nitrogen concentration (N(L)) to tropospheric ozone (O(3)) Prunus serotina seedlings grown in open-plots (AA) open-top chambers, supplied with either carbon-filtered or non-filtered air. found significant variation A, g(wv), N(L) (P < 0.05) among O(3) treatments. Seedlings AA showed highest A g(wv) due relatively low vapor pressure deficit (VPD). Older leaves significantly lower N(L), higher injury 0.001) than younger leaves. Leaf affected O(3). Both VPD had a strong influence gas exchange. Foliar O(3)-induced appeared when cumulative uptake reached 8-12 mmol m(-2), depending soil water availability. The mechanistic assessment is valuable approach for biologically relevant risk forest trees.
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