Combining d13C and d18O analyses to unravel competition, CO2 and O3 effects on the physiological performance of different-aged trees.
Nenhuma Miniatura Disponível
Data
2007
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
Combined d13C and d18O analyses of leaf material were
used to infer changes in photosynthetic capacity (Amax) and
stomatal conductance (gl) in Fagus sylvatica and Picea
abies trees growing under natural and controlled conditions.
Correlation between gl and d18O in leaf cellulose
(d18Ocel) allowed us to apply a semi-quantitative model to
infer gl from d18Ocel and also interpret variation in d13C as
reflecting variation in Amax. Extraction of leaf cellulose was
necessary, because d18O from leaf organic matter (d18OLOM)
and d18Ocel was not reliably correlated.
In juvenile trees, the model predicted elevated carbon
dioxide (CO2) to reduce Amax in both species, whereas
ozone (O3) only affected beech by reducing CO2 uptake via
lowered gl. In adult trees, Amax declined with decreasing
light level as gl was unchanged. O3 did not significantly
affect isotopic signatures in leaves of adult trees, reflecting
the higher O3 susceptibility of juvenile trees under controlled
conditions. The isotopic analysis compared favourably
to the performance of leaf gas exchange, underlining
that the semi-quantitative model approach provides a
robust way to gather time-integrated information on photosynthetic
performance of trees under multi-faced ecological
scenarios, in particular when information needed for
quantitative modelling is only scarcely available.
Descrição
Palavras-chave
Fagus sylvatica, Cellulose, Stable, Semi-quantitative model approach
Citação
GRAMS, T. E. E. et al. Combining d13C and d18O analyses to unravel competition, CO2 and O3 effects on the physiological performance of different-aged trees Plant, Cell and Environment, v. 30, p. 1023-1034, 2007. Disponível em: <https://onlinelibrary.wiley.com/doi/full/10.1111/j.1365-3040.2007.01696.x>. Acesso em: 20 de jul. 2017.