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Title

Plant functional traits and canopy structure control the relationship between photosynthetic CO2 uptake and far-red sun-induced fluorescence in a Mediterranean grassland under different nutrient availability

AuthorsMigliavacca, Mirco; Perez Prieto, Oscar; Rossini, Micol; El Madany Tarek, S; Moreno Gerardo; van der Tol, Christiaan; Rascher, Uwe; Berninger Anna; Bessenbacher Verena; Burkart, Andreas; Carrara, Arnaud; Fava, Francesco; Hong Juan, Jin; Hammer, Tiana W.; Henkel Kathrin; Juarez Alcalde, Enrique; Julitta, Tommaso; Kolle,Olaf; Pilar Martín, M.; Musavi, Talie; Pacheco-Labrador, Javier; Perez Burgueño, Andrea; Wutzler, Thomas; Zaehle, Sonke; Reichstein, Markus
KeywordsCanopy structure
Far‐red sun‐induced fluorescence
Functional traits
Gross primary productivity (GPP)
Leaf inclination distribution function
Nutrient manipulation
Soil–canopy observation of photosynthesis and energy (SCOPE) mode
Issue Date2017
PublisherBlackwell Publishing
CitationNew Phytologist 214: 1078-1091 (2017)
AbstractSun-induced fluorescence (SIF) in the far-red region provides a new noninvasive measurement approach that has the potential to quantify dynamic changes in light-use efficiency and gross primary production (GPP). However, the mechanistic link between GPP and SIF is not completely understood. We analyzed the structural and functional factors controlling the emission of SIF at 760 nm (F760) in a Mediterranean grassland manipulated with nutrient addition of nitrogen (N), phosphorous (P) or nitrogen¿phosphorous (NP). Using the soil¿canopy observation of photosynthesis and energy (SCOPE) model, we investigated how nutrient-induced changes in canopy structure (i.e. changes in plant forms abundance that influence leaf inclination distribution function, LIDF) and functional traits (e.g. N content in dry mass of leaves, N%, Chlorophyll a+b concentration (Cab) and maximum carboxylation capacity (Vcmax)) affected the observed linear relationship between F760 and GPP. We conclude that the addition of nutrients imposed a change in the abundance of different plant forms and biochemistry of the canopy that controls F760. Changes in canopy structure mainly control the GPP¿F760 relationship, with a secondary effect of Cab and Vcmax. In order to exploit F760 data to model GPP at the global/regional scale, canopy structural variability, biodiversity and functional traits are important factors that have to be considered.
Publisher version (URL)https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.14437
URIhttp://hdl.handle.net/10261/208600
Identifiersdoi: https://doi.org/10.1111/nph.14437
issn: 1469-8137
Appears in Collections:(CCHS-IEGD) Artículos
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