Premium
Plant functional traits and canopy structure control the relationship between photosynthetic CO 2 uptake and far‐red sun‐induced fluorescence in a Mediterranean grassland under different nutrient availability
Author(s) -
Migliavacca Mirco,
PerezPriego Oscar,
Rossini Micol,
ElMadany Tarek S.,
Moreno Gerardo,
van der Tol Christiaan,
Rascher Uwe,
Berninger Anna,
Bessenbacher Verena,
Burkart Andreas,
Carrara Arnaud,
Fava Francesco,
Guan JinHong,
Hammer Tiana W.,
Henkel Kathrin,
JuarezAlcalde Enrique,
Julitta Tommaso,
Kolle Olaf,
Martín M. Pilar,
Musavi Talie,
PachecoLabrador Javier,
PérezBurgueño Andrea,
Wutzler Thomas,
Zaehle Sönke,
Reichstein Markus
Publication year - 2017
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.14437
Subject(s) - canopy , grassland , nutrient , photosynthesis , photosynthetic capacity , abundance (ecology) , botany , agronomy , biology , chemistry , ecology
Summary 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 (F 760 ) 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 ( C ab) and maximum carboxylation capacity ( V cmax )) affected the observed linear relationship between F 760 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 F 760 . Changes in canopy structure mainly control the GPP –F 760 relationship, with a secondary effect of C ab and V cmax . In order to exploit F 760 data to model GPP at the global/regional scale, canopy structural variability, biodiversity and functional traits are important factors that have to be considered.