Interpreting tree responses to thinning and fertilization using tree-ring stable isotopes.
New Phytol
; 190(3): 770-82, 2011 May.
Article
em En
| MEDLINE
| ID: mdl-21284649
ABSTRACT
⢠Carbon sequestration has focused renewed interest in understanding how forest management affects forest carbon gain over timescales of decades, and yet details of the physiological mechanisms over decades are often lacking for understanding long-term growth responses to management. ⢠Here, we examined tree-ring growth patterns and stable isotopes of cellulose (δ(13)C(cell) and δ(18)O(cell)) in a thinning and fertilization controlled experiment where growth increased substantially in response to treatments to elucidate physiological data and to test the dual isotope approach for uses in other locations. ⢠δ(13)C(cell) and δ(18)O(cell) results indicated that fertilization caused an increase in intrinsic water-use efficiency through increases in photosynthesis (A) for the first 3 yr. The combination treatment caused a much larger increase in A and water-use efficiency. Only the thinning treatments showed consistent significant increases in δ(18)O(cell) above controls. Changes in canopy microclimate are the likely drivers for δ(18)O(cell) increases with decreases in relative humidity and increases in leaf temperature associated with thinning being the most probable causes. ⢠Tree-ring isotopic records, particularly δ(13)C(cell), remain a viable way to reconstruct long-term physiological mechanisms affecting tree carbon gain in response to management and climate fluctuations.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Árvores
/
Fertilizantes
/
Marcação por Isótopo
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
New Phytol
Assunto da revista:
BOTANICA
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Estados Unidos