Title: Upscaling Ozone Flux in Forests from Leaf to Landscape
Citation: Italian Journal of Agronomy vol. 3 no. 1 p. 35-41
Publisher: Società Italiana di Agronomia - Forum Editrice
Publication Year: 2008
JRC N°: JRC48857
URI: http://www.agr.unipi.it/gtta/IJA/IJA-HomePage.html
Type: Articles in periodicals and books
Abstract: Although stomatal conductance for ozone (O3) correlates with leaf to air water vapor difference (VPDLA) at the leaf level, uncertainty in up-scaling to the whole tree level can be overcome by means of sap flow measurements at the tree trunk. Further up-scaling to the stand level is possible by relating whole tree O3 flux to silvicultural and/or tree-allometric data. In such a way, canopy conductance and O3 uptake can be related to ground surface area. When normalized, canopy conductance is demonstrated to follow a functional relationship to VPDLA across several forest ecosystems thus allowing a generalization of model approaches. Further up-scaling to the landscape level, however, needs further investigations due to differences in the response of canopy conductance to environmental drivers in forest stands and grassland ecosystems, respectively.
JRC Directorate:Sustainable Resources

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