Photosynthesis of Quercus suber is affected by atmospheric NH3 generated by multifunctional agrosystems.
Tree Physiol
; 33(12): 1328-37, 2013 Dec.
Article
en En
| MEDLINE
| ID: mdl-24150034
ABSTRACT
Montados are evergreen oak woodlands dominated by Quercus species, which are considered to be key to biodiversity conservation and ecosystem services. This ecosystem is often used for cattle breeding in most regions of the Iberian Peninsula, which causes plants to receive extra nitrogen as ammonia (NH(3)) through the atmosphere. The effect of this atmospheric NH(3) (NH(3atm)) on ecosystems is still under discussion. This study aimed to evaluate the effects of an NH(3atm) concentration gradient downwind of a cattle barn in a Montado area. Leaves from the selected Quercus suber L. trees along the gradient showed a clear influence of the NH(3) on δ(13)C, as a consequence of a strong limitation on the photosynthetic machinery by a reduction of both stomatal and mesophyll conductance. A detailed study of the impact of NH(3atm) on the photosynthetic performance of Q. suber trees is presented, and new mechanisms by which NH(3) affects photosynthesis at the leaf level are suggested.
Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Fotosíntesis
/
Transpiración de Plantas
/
Quercus
/
Amoníaco
Idioma:
En
Revista:
Tree Physiol
Asunto de la revista:
BOTANICA
/
FISIOLOGIA
Año:
2013
Tipo del documento:
Article