TY - JOUR
T1 - Seasonality of ecosystem respiration and gross primary production as derived from FLUXNET measurements
AU - Falge, Eva
AU - Baldocchi, Dennis
AU - Tenhunen, John
AU - Aubinet, Marc
AU - Bakwin, Peter
AU - Berbigier, Paul
AU - Bernhofer, Christian
AU - Burba, George
AU - Clement, Robert
AU - Davis, Kenneth J.
AU - Elbers, Jan A.
AU - Goldstein, Allen H.
AU - Grelle, Achim
AU - Granier, André
AU - Gumundsson, Jón
AU - Hollinger, David
AU - Kowalski, Andrew S.
AU - Katul, Gabriel
AU - Law, Beverly E.
AU - Malhi, Yadvinder
AU - Meyers, Tilden
AU - Monson, Russell K.
AU - Munger, J. William
AU - Oechel, Walt
AU - Paw U, Kyaw Tha
AU - Pilegaard, Kim
AU - Rannik, Üllar
AU - Rebmann, Corinna
AU - Suyker, Andrew
AU - Valentini, Riccardo
AU - Wilson, Kell
AU - Wofsy, Steve
N1 - Funding Information:
This work is supported by the BMBF project BITÖK (PT BEO 51-0339476) and the FLUXNET program (sponsored by NASA’s EOS Validation Program). It contributes to the projects CARBODATA and CARBOEUROFLUX of the European Union (supported by the EC’s Fifth Framework Program, R&TD contract CARBOEUROFLUX, contract no. EVK2-CT-1999-0032), and the AmeriFlux program (US Department of Energy’s Terrestrial Carbon Program, and NIGEC Program).
PY - 2002/12/2
Y1 - 2002/12/2
N2 - Differences in the seasonal pattern of assimilatory and respiratory processes are responsible for divergences in seasonal net carbon exchange among ecosystems. Using FLUXNET data (http://www.eosdis.ornl.gov/FLUXNET) we have analyzed seasonal patterns of gross primary productivity (FGPP), and ecosystem respiration (FRE) of boreal and temperate, deciduous and coniferous forests, Mediterranean evergreen systems, a rainforest, temperate grasslands, and C3 and C4 crops. Based on generalized seasonal patterns classifications of ecosystems into vegetation functional types can be evaluated for use in global productivity and climate change models. The results of this study contribute to our understanding of respiratory costs of assimilated carbon in various ecosystems. Seasonal variability of FGPP and FRE of the investigated sites increased in the order tropical < Mediterranean < temperate coniferous < temperate deciduous < boreal forests. Together with the boreal forest sites, the managed grasslands and crops show the largest seasonal variability. In the temperate coniferous forests, seasonal patterns of FGPP and FRE are in phase, in the temperate deciduous and boreal coniferous forests FRE was delayed compared to FGPP, resulting in the greatest imbalance between respiratory and assimilatory fluxes early in the growing season. FGPP adjusted for the length of the carbon uptake period decreased at the sampling sites across functional types in the order C4 crops, temperate and boreal deciduous forests (7.5-8.3 g C m-2 per day) > temperate conifers, C3 grassland and crops (5.7-6.9 g C m-2 per day) > boreal conifers (4.6 g C m-2 per day). Annual FGPP and net ecosystem productivity (FNEP) decreased across climate zones in the order tropical > temperate > boreal. However, the decrease in FNEP with latitude was greater than the decrease in FGPP, indicating a larger contribution of respiratory (especially heterotrophic) processes in boreal systems.
AB - Differences in the seasonal pattern of assimilatory and respiratory processes are responsible for divergences in seasonal net carbon exchange among ecosystems. Using FLUXNET data (http://www.eosdis.ornl.gov/FLUXNET) we have analyzed seasonal patterns of gross primary productivity (FGPP), and ecosystem respiration (FRE) of boreal and temperate, deciduous and coniferous forests, Mediterranean evergreen systems, a rainforest, temperate grasslands, and C3 and C4 crops. Based on generalized seasonal patterns classifications of ecosystems into vegetation functional types can be evaluated for use in global productivity and climate change models. The results of this study contribute to our understanding of respiratory costs of assimilated carbon in various ecosystems. Seasonal variability of FGPP and FRE of the investigated sites increased in the order tropical < Mediterranean < temperate coniferous < temperate deciduous < boreal forests. Together with the boreal forest sites, the managed grasslands and crops show the largest seasonal variability. In the temperate coniferous forests, seasonal patterns of FGPP and FRE are in phase, in the temperate deciduous and boreal coniferous forests FRE was delayed compared to FGPP, resulting in the greatest imbalance between respiratory and assimilatory fluxes early in the growing season. FGPP adjusted for the length of the carbon uptake period decreased at the sampling sites across functional types in the order C4 crops, temperate and boreal deciduous forests (7.5-8.3 g C m-2 per day) > temperate conifers, C3 grassland and crops (5.7-6.9 g C m-2 per day) > boreal conifers (4.6 g C m-2 per day). Annual FGPP and net ecosystem productivity (FNEP) decreased across climate zones in the order tropical > temperate > boreal. However, the decrease in FNEP with latitude was greater than the decrease in FGPP, indicating a larger contribution of respiratory (especially heterotrophic) processes in boreal systems.
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U2 - 10.1016/S0168-1923(02)00102-8
DO - 10.1016/S0168-1923(02)00102-8
M3 - Article
AN - SCOPUS:0037010666
SN - 0168-1923
VL - 113
SP - 53
EP - 74
JO - Agricultural and Forest Meteorology
JF - Agricultural and Forest Meteorology
IS - 1-4
ER -
