Journal
ENVIRONMENTAL POLLUTION
Volume 134, Issue 2, Pages 209-216Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2004.08.005
Keywords
grassland; irrigation; ozone; stable carbon isotopes; stomatal conductance
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Stable carbon isotope ratios (delta(13)C) and leaf conductance (g(s)) were measured (2002, 2003) in Holcus lanatus L., Plantago lanceolata L. Ranunculus friesianus (Jord.), and Trifolium pratense L. at two levels of ozone (O-3) with or without irrigation. In non-irrigated control plots, R. friesianus showed the least negative delta(13)C, and the smallest response to the treatments. Irrigation caused more negative delta(13)C, especially in H. lanatus. Irrespective of irrigation, O-3 increased delta(13)C in relationship to a decrease in gs in P. lanceolata and T. pratense. The strongest effect of O-3 on delta(13)C occurred in the absence of irrigation, suggesting that under field conditions lack of moisture in the top soil does not always lead to protection from O-3 uptake. It is concluded that in species such as T. pratense plants can maintain stomatal O-3 Uptake during dry periods when roots can reach deeper soil layers where water is not limiting. (C) 2004 Elsevier Ltd. All rights reserved.
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