Seasonality of ecosystem respiration and gross primary production as derived from FLUXNET measurements

Eva Falge, Dennis Baldocchi, John Tenhunen, Marc Aubinet, Peter Bakwin, Paul Berbigier, Christian Bernhofer, George Burba, Robert Clement, Kenneth J. Davis, Jan A. Elbers, Allen H. Goldstein, Achim Grelle, André Granier, Jón Gumundsson, David Hollinger, Andrew S. Kowalski, Gabriel Katul, Beverly E. Law, Yadvinder MalhiTilden Meyers, Russell K. Monson, J. William Munger, Walt Oechel, Kyaw Tha Paw U, Kim Pilegaard, Üllar Rannik, Corinna Rebmann, Andrew Suyker, Riccardo Valentini, Kell Wilson, Steve Wofsy

Research output: Contribution to journalArticlepeer-review

578 Scopus citations


Differences in the seasonal pattern of assimilatory and respiratory processes are responsible for divergences in seasonal net carbon exchange among ecosystems. Using FLUXNET data ( 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.

Original languageEnglish (US)
Pages (from-to)53-74
Number of pages22
JournalAgricultural and Forest Meteorology
Issue number1-4
StatePublished - Dec 2 2002

All Science Journal Classification (ASJC) codes

  • Forestry
  • Agronomy and Crop Science
  • Global and Planetary Change
  • Atmospheric Science


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