Variability of sun-induced chlorophyll fluorescence according to stand age-related processes in a managed loblolly pine forest
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© 2018 John Wiley & Sons Ltd 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.
SubjectScience & Technology
Life Sciences & Biomedicine
Biodiversity & Conservation
Environmental Sciences & Ecology
forest stand age
Parker Tract forest
red fluorescence yield
sun-induced chlorophyll fluorescence
GROSS PRIMARY PRODUCTION
PHOTOCHEMICAL REFLECTANCE INDEX
ECOSYSTEM CARBON EXCHANGE
Published Version (Please cite this version)10.1111/gcb.14097
Publication InfoColombo, Roberto; Celesti, Marco; Bianchi, Remo; Campbell, Petya KE; Cogliati, Sergio; Cook, Bruce D; ... Schickling, Anke (2018). Variability of sun-induced chlorophyll fluorescence according to stand age-related processes in a managed loblolly pine forest. Global Change Biology, 24(7). pp. 2980-2996. 10.1111/gcb.14097. Retrieved from https://hdl.handle.net/10161/17325.
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Visiting Professorin the Nicholas School of the Environment
Bordeaux Sciences Agro in FRANCE (primary appointment)Discovery of knowledge in Plant water relations, ecosystem ecology and ecohydrology, with special focus on: - Long-distance water transport under future climate; - Drought tolerance and avoidance; - Patterns of changes in structural and functional traits within individual plants. My goal as a researcher is to improve the fundamental science understanding of how plants and terrestrial ecosystems respond to climate