Variability of sun-induced chlorophyll fluorescence according to stand age-related processes in a managed loblolly pine forest
Abstract
© 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.
Type
Journal articleSubject
Science & TechnologyLife Sciences & Biomedicine
Biodiversity Conservation
Ecology
Environmental Sciences
Biodiversity & Conservation
Environmental Sciences & Ecology
FLEX mission
fluorescence normalization
forest stand age
HyPlant spectrometer
loblolly pine
Parker Tract forest
red fluorescence yield
sun-induced chlorophyll fluorescence
GROSS PRIMARY PRODUCTION
PHOTOCHEMICAL REFLECTANCE INDEX
ECOSYSTEM CARBON EXCHANGE
LEAF-AREA INDEX
SATELLITE DATA
WATER-STRESS
PHOTOSYNTHETIC CAPACITY
HYPERSPECTRAL IMAGERY
STOMATAL CONDUCTANCE
HYDRAULIC LIMITATION
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https://hdl.handle.net/10161/17325Published Version (Please cite this version)
10.1111/gcb.14097Publication Info
Colombo, 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.This is constructed from limited available data and may be imprecise. To cite this
article, please review & use the official citation provided by the journal.
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Show full item recordScholars@Duke
Jean Christophe Domec
Visiting Professor in 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

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