Exemplifying whole-plant ozone uptake in adult forest trees of contrasting species and site conditions.
Whole-tree O3 uptake was exemplified for Picea abies, Fagus sylvatica and Larix decidua in stands at high and low altitude and contrasting water availability through sap flow measurement in tree trunks, intrinsically accounting for drought and boundary layer effects on O3 flux. O3 uptake of evergreen spruce per unit foliage area was enhanced by 100% at high relative to low elevation, whereas deciduous beech and larch showed similar uptake regardless of altitude. The responsiveness of the canopy conductance to water vapor and, as a consequence, O3 uptake to soil moisture and air humidity did not differ between species. Unifying findings at the whole-tree level will promote cause-effect based O3 risk assessment and modeling.
Nunn
Angela J
AJ
Ecophysiology of Plants, Department of Ecology, Technical University of München, Am Hochanger 13, D-85354 Freising, Bavaria, Germany. nunn@wzw.tum.de
Wieser
Gerhard
G
Metzger
Ursula
U
Löw
Markus
M
Wipfler
Philip
P
Häberle
Karl-Heinz
KH
Matyssek
Rainer
R
D000531:Altitude; D004781:Environmental Exposure / Q000009:adverse effects; D029964:Fagus / Q000187:drug effects / Q000378:metabolism / Q000502:physiology; D006813:Humidity; D028221:Larix / Q000187:drug effects / Q000378:metabolism / Q000502:physiology; D010083:Oxidants, Photochemical / Q000493:pharmacokinetics / Q000633:toxicity*; D010126:Ozone / Q000493:pharmacokinetics / Q000633:toxicity*; D028222:Picea / Q000187:drug effects / Q000378:metabolism / Q000502:physiology; D018515:Plant Leaves / Q000502:physiology; D018526:Plant Transpiration / Q000502:physiology; D013045:Species Specificity; D014197:Trees / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D014919:Wind; D052584:Xylem / Q000502:physiology
D010083:Oxidants, Photochemical; D010126:Ozone