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Nitrogen controls plant canopy light-use efficiency in temperate and boreal ecosystems

Kergoat, Laurent; Lafont, Sebastien; Arneth, Almut LU ; Le Dantec, Valerie and Saugier, Bernard (2008) In Journal of Geophysical Research 113(G4). p.04017-04017
Abstract
Optimum daily light-use efficiency (LUE) and normalized canopy photosynthesis (GEE*) rate, a proxy for LUE, have been derived from eddy covariance CO2 flux measurements obtained at a range of sites located in the mid to high latitudes. These two variables were analyzed with respect to environmental conditions, plant functional types (PFT) and leaf nitrogen concentration, in an attempt to characterize their variability and their potential drivers. LUE averaged 0.0182 mol/mol with a coefficient of variation of 37% (42% for GEE*). Foliar nitrogen N of the dominant plant species was found to explain 71% of LUE (n = 26) and 62% of GEE* (n = 44) variance, across all PFTs and sites. Mean Annual Temperature, MAT, explained 27% of LUE variance, and... (More)
Optimum daily light-use efficiency (LUE) and normalized canopy photosynthesis (GEE*) rate, a proxy for LUE, have been derived from eddy covariance CO2 flux measurements obtained at a range of sites located in the mid to high latitudes. These two variables were analyzed with respect to environmental conditions, plant functional types (PFT) and leaf nitrogen concentration, in an attempt to characterize their variability and their potential drivers. LUE averaged 0.0182 mol/mol with a coefficient of variation of 37% (42% for GEE*). Foliar nitrogen N of the dominant plant species was found to explain 71% of LUE (n = 26) and 62% of GEE* (n = 44) variance, across all PFTs and sites. Mean Annual Temperature, MAT, explained 27% of LUE variance, and the two factors (MAT and N) combined in a simple linear model explain 80% of LUE and 76% GEE* variance. These results showed that plant canopies in the temperate, boreal and arctic zones fit into a general scheme closely related to the one, which had been established for plant leaves worldwide. The N-MAT- LUE relationships offer perspectives for LUE-based models of terrestrial photosynthesis based on remote sensing. On a continental scale, the decrease of LUE from the temperate to the arctic zone found in the data derived from flux measurements is not in line with LUE resulting from inversion of atmospheric CO2. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Geophysical Research
volume
113
issue
G4
pages
04017 - 04017
publisher
American Geophysical Union
external identifiers
  • wos:000261145300001
  • scopus:61349168068
ISSN
2156-2202
DOI
10.1029/2007JG000676
language
English
LU publication?
yes
id
74778539-a8a0-413c-b47c-df3b0c4df9bc (old id 1307561)
date added to LUP
2009-03-20 08:29:57
date last changed
2017-06-18 03:44:30
@article{74778539-a8a0-413c-b47c-df3b0c4df9bc,
  abstract     = {Optimum daily light-use efficiency (LUE) and normalized canopy photosynthesis (GEE*) rate, a proxy for LUE, have been derived from eddy covariance CO2 flux measurements obtained at a range of sites located in the mid to high latitudes. These two variables were analyzed with respect to environmental conditions, plant functional types (PFT) and leaf nitrogen concentration, in an attempt to characterize their variability and their potential drivers. LUE averaged 0.0182 mol/mol with a coefficient of variation of 37% (42% for GEE*). Foliar nitrogen N of the dominant plant species was found to explain 71% of LUE (n = 26) and 62% of GEE* (n = 44) variance, across all PFTs and sites. Mean Annual Temperature, MAT, explained 27% of LUE variance, and the two factors (MAT and N) combined in a simple linear model explain 80% of LUE and 76% GEE* variance. These results showed that plant canopies in the temperate, boreal and arctic zones fit into a general scheme closely related to the one, which had been established for plant leaves worldwide. The N-MAT- LUE relationships offer perspectives for LUE-based models of terrestrial photosynthesis based on remote sensing. On a continental scale, the decrease of LUE from the temperate to the arctic zone found in the data derived from flux measurements is not in line with LUE resulting from inversion of atmospheric CO2.},
  author       = {Kergoat, Laurent and Lafont, Sebastien and Arneth, Almut and Le Dantec, Valerie and Saugier, Bernard},
  issn         = {2156-2202},
  language     = {eng},
  number       = {G4},
  pages        = {04017--04017},
  publisher    = {American Geophysical Union},
  series       = {Journal of Geophysical Research},
  title        = {Nitrogen controls plant canopy light-use efficiency in temperate and boreal ecosystems},
  url          = {http://dx.doi.org/10.1029/2007JG000676},
  volume       = {113},
  year         = {2008},
}