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Guanter, LuisAuthor

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January 13, 2025
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Variability of sun-induced chlorophyll fluorescence according to stand age-related processes in a managed loblolly pine forest

Publicated to: GLOBAL CHANGE BIOLOGY. 24 (7): 2980-2996 - 2018-07-01 24(7), DOI: 10.1111/gcb.14097

Authors:

Colombo, Roberto; Celesti, Marco; Bianchi, Remo; Campbell, Petya K E; Cogliati, Sergio; Cook, Bruce D; Corp, Lawrence A; Damm, Alexander; Domec, Jean-Christophe; Guanter, Luis; Julitta, Tommaso; Middleton, Elizabeth M; Noormets, Asko; Panigada, Cinzia; Pinto, Francisco; Rascher, Uwe; Rossini, Micol; Schickling, Anke
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Affiliations

Duke Univ, Nicholas Sch Environm, Durham, NC 27708 USA - Author
ESRIN Earth Observat, ESA, Frascati, Italy - Author
Forschungszentrum Julich, Inst Bio & Geosci, IBG Plant Sci 2, Julich, Germany - Author
German Res Ctr Geosci GFZ, Helmholtz Ctr Potsdam, Potsdam, Germany - Author
INRA, ISPA, Bordeaux Sci Agro, UMR 1391, Gradignan, France - Author
Int Maize & Wheat Improvement Ctr CIMMYT, Global Wheat Program, Mexico City, DF, Mexico - Author
NASA, GSFC, Biospher Sci Lab, Greenbelt, MD USA - Author
North Carolina State Univ, Dept Forestry & Environm Resources, Raleigh, NC 27695 USA - Author
Sci Syst & Applicat Inc, Lanham, MD USA - Author
Swiss Fed Inst Aquat Sci & Technol, Eawag, Dept Surface Waters Res & Management, Dubendorf, Switzerland - Author
Univ Maryland Baltimore Cty, Joint Ctr Earth Syst Technol, Baltimore, MD 21228 USA - Author
Univ Milano Bicocca, DISAT, Remote Sensing Environm Dynam Lab, Milan, Italy - Author
Univ Zurich, Remote Sensing Labs, Zurich, Switzerland - Author
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Abstract

Leaf fluorescence can be used to track plant development and stress, and is considered the most direct measurement of photosynthetic activity available from remote sensing techniques. Red and far-red sun-induced chlorophyll fluorescence (SIF) maps were generated from high spatial resolution images collected with the HyPlant airborne spectrometer over even-aged loblolly pine plantations in North Carolina (United States). Canopy fluorescence yield (i.e., the fluorescence flux normalized by the light absorbed) in the red and far-red peaks was computed. This quantifies the fluorescence emission efficiencies that are more directly linked to canopy function compared to SIF radiances. Fluorescence fluxes and yields were investigated in relation to tree age to infer new insights on the potential of those measurements in better describing ecosystem processes. The results showed that red fluorescence yield varies with stand age. Young stands exhibited a nearly twofold higher red fluorescence yield than mature forest plantations, while the far-red fluorescence yield remained constant. We interpreted this finding in a context of photosynthetic stomatal limitation in aging loblolly pine stands. Current and future satellite missions provide global datasets of SIF at coarse spatial resolution, resulting in intrapixel mixture effects, which could be a confounding factor for fluorescence signal interpretation. To mitigate this effect, we propose a surrogate of the fluorescence yield, namely the Canopy Cover Fluorescence Index (CCFI) that accounts for the spatial variability in canopy structure by exploiting the vegetation fractional cover. It was found that spatial aggregation tended to mask the effective relationships, while the CCFI was still able to maintain this link. This study is a first attempt in interpreting the fluorescence variability in aging forest stands and it may open new perspectives in understanding long-term forest dynamics in response to future climatic conditions from remote sensing of SIF.
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Keywords

ChlorophyllFlex missionFluorescenceFluorescence normalizationForest stand ageForestsGross primary productionHydraulic limitationHyperspectral imageryHyplant spectrometerLeaf-areaLoblolly pineNet photosynthesisNorth carolinaParker tract forestPhotochemical reflectance indexPhotosynthesisPhotosynthetic capacityPinus taedaPlant developmentPlant leavesRed fluorescence yieldStomatal conductanceSun-induced chlorophyll fluorescencSun-induced chlorophyll fluorescenceVegetation indexeWater-stress

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal GLOBAL CHANGE BIOLOGY 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, 2018, it was in position 1/59, thus managing to position itself as a Q1 (Primer Cuartil), in the category Biodiversity Conservation. Notably, the journal is positioned above the 90th percentile.

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: 1.33. 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)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2026-04-02, the following number of citations:

  • WoS: 31
  • Europe PMC: 6
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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 2026-04-02:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 93.
  • 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: 90 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 2.
  • The number of mentions on the social network X (formerly Twitter): 3 (Altmetric).
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Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: France; Germany; Italy; Mexico; Switzerland; United States of America.

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Awards linked to the item

ESA/NASA Joint FLEX-US campaign; German Research Foundation (DFG); Duke Provost's Collaboratories initiative, and from the National Science foundation, Grant/ Award Number: NSF-IOS-1754893
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