June 9, 2019
Publications
>
Article

Temporal and spatial patterns of internal and external stem CO2 fluxes in a sub-Mediterranean oak

Publicated to: TREE PHYSIOLOGY. 36 (11): 1409-1421 - 2016-11-28 36(11), DOI: 10.1093/treephys/tpw029

Authors:

Salomón, RL; Valbuena-Carabaña, M; Gil, L; McGuire, MA; Teskey, RO; Aubrey, DP; González-Doncel, I; Rodríguez-Calcerrada, J
[+]

Affiliations

Tech Univ Madrid, Forest Genet & Ecophysiol Res Grp, ETS Forestry Engn, Ciudad Univ S-N, Madrid 28040, Spain - Author
Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA - Author
Univ Georgia, Warnell Sch Forestry & Nat Resources, 180 East Green St, Athens, GA 30602 USA - Author
See more

Abstract

To accurately estimate stem respiration (R-S), measurements of both carbon dioxide (CO2) efflux to the atmosphere (E-A) and internal CO2 flux through xylem (F-T) are needed because xylem sap transports respired CO2 upward. However, reports of seasonal dynamics of F-T and E-A are scarce and no studies exist in Mediterranean species under drought stress conditions. Internal and external CO2 fluxes at three stem heights, together with radial stem growth, temperature, sap flow and shoot water potential, were measured in Quercus pyrenaica Willd. in four measurement campaigns during one growing season. Substantial daytime depressions in temperature-normalized E-A were observed throughout the experiment, including prior to budburst, indicating that diel hysteresis between stem temperature and E-A cannot be uniquely ascribed to diversion of CO2 in the transpiration stream. Low internal [CO2] (<0.5%) resulted in low contributions of F-T to R-S throughout the growing season, and R-S was mainly explained by E-A (>90%). Internal [CO2] was found to vary vertically along the stems. Seasonality in resistance to radial CO2 diffusion was related to shoot water potential. The low internal [CO2] and F-T observed in our study may result from the downregulation of xylem respiration in response to a legacy of coppicing as well as high radial diffusion of CO2 through cambium, phloem and bark tissues, which was related to low water content of stems. Long-term studies analyzing temporal and spatial variation in internal and external CO2 fluxes and their interactions are needed to mechanistically understand and model respiration of woody tissues.
[+]

Keywords

carbon balancecarbon lossdaytime co2 depressionforest declineseasonal variationstem co2 effluxsummer droughtBetween-tree variationCarbon balanceCarbon dioxideCarbon lossCarbon-dioxide effluxDaytime co2 depressionForestForest declineLoblolly-pine treesNorway sprucePlant stemsQuercusQuercus-pyrenaica willd.RespirationSap-flowSeasonal variationSeasonal-variationSpainStem co2 effluxSummer droughtTreesXylemXylem co2 transport

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal TREE PHYSIOLOGY due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2016, it was in position 2/64, thus managing to position itself as a Q1 (Primer Cuartil), in the category Forestry.

From a relative perspective, and based on the normalized impact indicator calculated from World Citations provided by WoS (ESI, Clarivate), it yields a value for the citation normalization relative to the expected citation rate of: 1.74. This indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: ESI Nov 13, 2025)

This information is reinforced by other indicators of the same type, which, although dynamic over time and dependent on the set of average global citations at the time of their calculation, consistently position the work at some point among the top 50% most cited in its field:

  • Weighted Average of Normalized Impact by the Scopus agency: 1.26 (source consulted: FECYT Mar 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2026-04-26, the following number of citations:

  • WoS: 33
  • Scopus: 34
  • Europe PMC: 8
  • Google Scholar: 33
[+]

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2026-04-26:

  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 44 (PlumX).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
  • Assignment of a Handle/URN as an identifier within the deposit in the Institutional Repository: https://oa.upm.es/86053/

As a result of the publication of the work in the institutional repository, statistical usage data has been obtained that reflects its impact. In terms of dissemination, we can state that, as of

  • Views: 114
  • Downloads: 52
[+]

Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: Georgia; United States of America.

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (SALOMON MORENO, ROBERTO LUIS) and Last Author (RODRIGUEZ CALCERRADA, JESUS).

[+]

Awards linked to the item

This work was funded by the Comunidad de Madrid through CAM P2009/AMB-1668 and P2013/MAE-2760 projects. R.L.S. was supported by a Ph.D. scholarship from the Universidad Politecnica de Madrid. J.R.-C. was supported by a Juan de la Cierva contract from the Spanish Ministry of Economy and Competitiveness.
[+]