View Item
- xmlui.general.dspace_homeCentros Regionales y EEAsCentro Regional Buenos Aires SurEEA BalcarceArtículos científicosxmlui.ArtifactBrowser.ItemViewer.trail
- DSpace Home
- Centros Regionales y EEAs
- Centro Regional Buenos Aires Sur
- EEA Balcarce
- Artículos científicos
- View Item
Patterns of resource use efficiency in relation to intra-specific competition, size of the trees and resource availability in ponderosa pine
Abstract
Patterns of resource use efficiency (RUE) in relation to intra-specific competition, size of the trees and resource availability are under debate. Also, the relationship between RUE and growth efficiency (GE) seems to be different depending on the genera studied. We test the following hypotheses: (1) RUE of the stand decreases after canopy closure mainly due to the decrease in RUE of the suppressed trees, (2) RUE increases with the availability of
[ver mas...]
Patterns of resource use efficiency (RUE) in relation to intra-specific competition, size of the trees and resource availability are under debate. Also, the relationship between RUE and growth efficiency (GE) seems to be different depending on the genera studied. We test the following hypotheses: (1) RUE of the stand decreases after canopy closure mainly due to the decrease in RUE of the suppressed trees, (2) RUE increases with the availability of resources and/or stand productivity and, (3) the efficiency of use of water, light and nitrogen are positively correlated each other, and are not correlated with GE. We measured or estimated at tree and plot level, the concentration of 13C in wood as a proxy of intrinsic water use efficiency (iWUE), nitrogen productivity (NP), light use efficiency (LUE) and GE in Pinus ponderosa trees growing in two sites in Patagonia, South-America. Within each site, we studied plots with contrasting intra-specific competition due to different plantation density. A decrease in NP and GE at plot level followed canopy closure, with no decrease in LUE or iWUE. In contrast to Hypothesis 1, the decrease in RUE of a stand, when it was observed, was due to a decrease in the efficiency of resource use of the dominant trees. The suppressed trees seem to always have low RUE, independently of canopy closure of the stand. The trend of a positive relation of RUE and resource availability is rather weak as a generalization (in contrast to Hypothesis 2), but it depends on the resource which use efficiency is analyzed. At plot level, NP, iWUE and GE did not present a correlation with stand productivity. Considering iWUE, no positive correlation was observed with tree size, which contrasts with previous findings. On the other hand, clear and positive relationships were observed between GE and NP with tree growth, supporting the hypothesis of higher RUE in those trees which are growing faster within the stand, which in turn are those which are surely accessing to more resources (soil resources and radiation). The third hypothesis stated in this study was not supported by our results. The only significant correlation was that observed between NP and GE, with no correlation at all between iWUE and the other resources use or growth efficiency.
[Cerrar]

Fuente
Forest Ecology and Management 312 : 231-238 (January 2014)
Date
2014-01-15
Editorial
Elsevier
ISSN
0378-1127
Formato
pdf
Tipo de documento
artículo
Derechos de acceso
Restringido

Metadata
Show full item recordRelated items
Showing items related by title, author, creator and subject.
-
Efecto de diferentes cultivos antecesores sobre productividad y eficiencia en el uso del agua de maíz para silaje = Effect of different previous crops on productivity and water use efficiency of silage corn
Scherger, Eric Daniel; Oderiz, Juan Agustin; Uhaldegaray, Mauricio Gaston; Fernandez, Romina; Quiroga, Alberto Raul; Camiletti, Fatima; Amiotti, Nilda Mabel (2016)En los últimos diez años a nivel nacional se produjo un incremento de la superficie destinada a silajes, desde 620.000 ha en 06/07 a 1.870.265 ha en el ciclo 14/15, lo que indica una gran intensificación en los modelos de ... -
Minimizing the time and cost of production of transgenic alfalfa libraries using the highly efficient completely sequenced vector pPZP200BAR
Bottero, Ana Emilia; Pascuan, Cecilia Gabriela; Pagano, Elba Maria; Ayub, Nicolás Daniel; Soto, Gabriela Cinthia; Jozefkowicz, Cintia (2016)Alfalfa is the most important forage legume worldwide. However, similar to other minor forage crops, it is usually harvested along with weeds, which decrease its nutrient quality and thus reduce its high value in the ... -
Fruiting efficiency : an alternative trait to further rise wheat yield
Slafer, Gustavo A; Elia, Mónica; Savin, Roxana; García, Guillermo Ariel; Terrile, Ignacio Ismael; Ferrante, Ariel; Miralles, Daniel Julio; Gonzalez, Fernanda Gabriela (2015-07)Further improvements in wheat yields are critical, for which increases in grain number would be required. In the recent past, higher grain number was achieved through increased growth of the juvenile spikes before anthesis, ...