Stomatal, soil and cuticular ozone deposition over a mature pine forest and an agricultural field
2009
Stella, Patrick | Loubet, Benjamin | Lamaud, Eric | Laville, Patricia | Bonnefond, Jean-Marc | Cellier, Pierre
Tropospheric ozone (O3) is known to damage vegetation, materials and human health. Moreover, as other greenhouse gases, the atmospheric concentration of O3 increases progressively and could reach concentrations of 100 ppb in 2100. Since the last decades, some studies have been performed over forest, crops and grasslands for a better understanding of ozone deposition. However, these studies consider the total ozone deposition and only a few are interested in the different pathways of deposition, i.e. stomatal, cuticular and soil deposition as well as chemical destruction of ozone. For a better understanding of how terrestrial ecosystems could be a sink for ozone, it is necessary to better understand the different pathways of deposition. To address this question, continuous measurements of ozone deposition and climatic conditions (RH, T°…) have been performed over an agricultural field with maize crop near Paris and a mature pine forest in South-West France during the year 2008. We present here results of total canopy conductance for ozone and the partitioning in stomatal and non stomatal components. This study focuses on the influence of climatic factors on ozone deposition and the role played by the structure of the canopy as well as on the role of NO reaction on non stomatal deposition.
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