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- Title
Plant functional traits and canopy structure control the relationship between photosynthetic CO<sub>2</sub> uptake and far-red sun-induced fluorescence in a Mediterranean grassland under different nutrient availability.
- Authors
Migliavacca, Mirco; Perez‐Priego, 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; Guan, Jin‐Hong; Hammer, Tiana W.; Henkel, Kathrin; Juarez‐Alcalde, Enrique; Julitta, Tommaso; Kolle, Olaf; Martín, M. Pilar; Musavi, Talie
- Abstract
Sun-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.
- Subjects
ECOLOGY; GRASSLANDS; PLANT canopies; CHLOROPHYLL; CARBOXYLATION; BIOCHEMISTRY
- Publication
New Phytologist, 2017, Vol 214, Issue 3, p1078
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/nph.14437