 |
| Titel |
The contribution of respiration in tree stems to the Dole Effect |
| VerfasserIn |
A. Angert, J. Muhr, R. Negrón Juárez, W. Alegria Muñoz, G. Kraemer, J. Ramirez Santillan, J. Q. Chambers, S. E. Trumbore |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 10 ; Nr. 9, no. 10 (2012-10-22), S.4037-4044 |
| Datensatznummer |
250007336
|
| Publikation (Nr.) |
 copernicus.org/bg-9-4037-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| Understanding the variability and the current value of the Dole Effect, which
has been used to infer past changes in biospheric productivity, requires
accurate information on the isotopic discrimination associated with
respiratory oxygen consumption in each of the biosphere components.
Respiration in tree stems is an important component of the land carbon cycle.
Here we measured, for the first time, the discrimination associated with tree
stem oxygen uptake. The measurements included tropical forest trees, which
are major contributors to the global fluxes of carbon and oxygen. We found
discrimination in the range of 12.6–21.5‰, indicating both
diffusion limitation, resulting in O2 discrimination values below
20‰, and alternative oxidase respiration, which resulted in
discrimination values greater than 20‰. Discrimination varied
seasonally, between and within tree species. Calculations based on these
results show that variability in woody plants discrimination can result in
significant variations in the global Dole Effect. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|