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Stomatal uptake of O-3 in aspen and aspen-birch forests under free-air CO2 and O-3 enrichment

Uddling, J; Hogg, AJ; Teclaw, RM; Carroll, MA and Ellsworth, DS (2010) In Environmental Pollution 158(6). p.2023-2031
Abstract
Rising atmospheric carbon dioxide (CO2) may alleviate the toxicological impacts of concurrently rising tropospheric ozone (O-3) during the present century if higher CO2 is accompanied by lower stomatal conductance (g,), as assumed by many models. We investigated how elevated concentrations of CO2 and O-3, alone and in combination, affected the accumulated stomatal flux of O-3 (AFst) by canopies and sun leaves in closed aspen and aspen-birch forests in the free-air CO2-O-3 enrichment experiment near Rhinelander, Wisconsin. Stomatal conductance for O-3 was derived from sap flux data and AFst was estimated either neglecting or accounting for the potential influence of non-stomatal leaf surface O-3 deposition. Leaf-level AFst (AFst(l)) was not... (More)
Rising atmospheric carbon dioxide (CO2) may alleviate the toxicological impacts of concurrently rising tropospheric ozone (O-3) during the present century if higher CO2 is accompanied by lower stomatal conductance (g,), as assumed by many models. We investigated how elevated concentrations of CO2 and O-3, alone and in combination, affected the accumulated stomatal flux of O-3 (AFst) by canopies and sun leaves in closed aspen and aspen-birch forests in the free-air CO2-O-3 enrichment experiment near Rhinelander, Wisconsin. Stomatal conductance for O-3 was derived from sap flux data and AFst was estimated either neglecting or accounting for the potential influence of non-stomatal leaf surface O-3 deposition. Leaf-level AFst (AFst(l)) was not reduced by elevated CO2. Instead, there was a significant CO2 x O-3 interaction on AFst(l), as a consequence of lower values of g(s) in control plots and the combination treatment than in the two single-gas treatments. In addition, aspen leaves had higher AFst(l) than birch leaves, and estimates of AFst(l) were not very sensitive to non-stomatal leaf surface O-3 deposition. Our results suggest that model projections of large CO2-induced reductions in g, alleviating the adverse effect of rising tropospheric O-3 may not be reasonable for northern hardwood forests. (C) 2009 Elsevier Ltd. All rights reserved. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Carbon dioxide, FACE, Forest, Ozone flux, Stomata
in
Environmental Pollution
volume
158
issue
6
pages
2023 - 2031
publisher
Elsevier
external identifiers
  • scopus:77952301147
ISSN
0269-7491
DOI
10.1016/j.envpol.2009.12.001
project
BECC
language
English
LU publication?
no
id
f765f22f-5b60-4406-8619-7f9ff1b12778 (old id 4448832)
date added to LUP
2014-05-23 12:11:35
date last changed
2018-05-29 12:22:02
@article{f765f22f-5b60-4406-8619-7f9ff1b12778,
  abstract     = {Rising atmospheric carbon dioxide (CO2) may alleviate the toxicological impacts of concurrently rising tropospheric ozone (O-3) during the present century if higher CO2 is accompanied by lower stomatal conductance (g,), as assumed by many models. We investigated how elevated concentrations of CO2 and O-3, alone and in combination, affected the accumulated stomatal flux of O-3 (AFst) by canopies and sun leaves in closed aspen and aspen-birch forests in the free-air CO2-O-3 enrichment experiment near Rhinelander, Wisconsin. Stomatal conductance for O-3 was derived from sap flux data and AFst was estimated either neglecting or accounting for the potential influence of non-stomatal leaf surface O-3 deposition. Leaf-level AFst (AFst(l)) was not reduced by elevated CO2. Instead, there was a significant CO2 x O-3 interaction on AFst(l), as a consequence of lower values of g(s) in control plots and the combination treatment than in the two single-gas treatments. In addition, aspen leaves had higher AFst(l) than birch leaves, and estimates of AFst(l) were not very sensitive to non-stomatal leaf surface O-3 deposition. Our results suggest that model projections of large CO2-induced reductions in g, alleviating the adverse effect of rising tropospheric O-3 may not be reasonable for northern hardwood forests. (C) 2009 Elsevier Ltd. All rights reserved.},
  author       = {Uddling, J and Hogg, AJ and Teclaw, RM and Carroll, MA and Ellsworth, DS},
  issn         = {0269-7491},
  keyword      = {Carbon dioxide,FACE,Forest,Ozone flux,Stomata},
  language     = {eng},
  number       = {6},
  pages        = {2023--2031},
  publisher    = {Elsevier},
  series       = {Environmental Pollution},
  title        = {Stomatal uptake of O-3 in aspen and aspen-birch forests under free-air CO2 and O-3 enrichment},
  url          = {http://dx.doi.org/10.1016/j.envpol.2009.12.001},
  volume       = {158},
  year         = {2010},
}