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

Authors

• Eva Falge, Pflanzenökologie, Universität Bayreuth, 95440 Bayreuth, Germany
• Dennis D. Baldocchi, University of California - BerkeleyFollow
• John Tenhunen, Pflanzenökologie, Universität Bayreuth, 95440 Bayreuth, Germany
• Marc Aubinet, Unité de Physique, Faculté des Sciences, Agronomiques de Gembloux, B-50 30 Gembloux, Belgium
• Peter Bakwin, NOAA/OAR, Climate Monitoring and Diagnostics Laboratory, 325 Broadway, Boulder, CO 80303, USA
• Paul Berbigier, INRA, Bioclimatologie, Bordeaux, France
• Christian Bernhofer, Technische Universität Dresden, IHM Meteorologie, Pienner Str. 9, 01737 Tharandt, Germany
• George Burba, University of Nebraska-LincolnFollow
• Robert Clement, Institute of Ecology and Resource Management, University of Edinburgh, Edinburgh EH9 3JU, UK
• Kenneth J. Davis, Pennsylvania State UniversityFollow
• Jan A. Elbers, Alterra, Postbus 47, 6700 AA Wageningen, The Netherlands
• Allen H. Goldstein, ESPM, University of California at Berkeley, Berkeley, CA 94720, USA
• Achim Grelle, Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden
• Andre Granier, INRA, Unité d’Ecophysiologie Forestière, F-54280 Champenoux, France
• Jon Gundmundsson, Department of Environmental Research, Agricultural Research Institute, Keldnaholti, IS-112 Reykjavik, Iceland
• David Hollinger, USDA Forest Service, 271 Mast Road, Durham, NH 03824, USA
• Andrew S. Kowalski, Research Group of Plant and Vegetation Ecology, Department of Biology, University of Antwerpen, Universiteitsplein 1, B-2610 Wilrijk, Antwerp, Belgium
• Gabriel Katul, School of the Environment, Duke University, Box 90328, Durham, NC 27708-0328, USA
• Beverly E. Law, Oregon State UniversityFollow
• Yadvinder Malhi, Institute of Ecology and Resource Management, University of Edinburgh, Edinburgh EH9 3JU, UK
• Tilden Meyers, NOAA/ATDD
• Russell K. Monson, University of Colorado, Boulde
• J. William Munger, Department of Earth and Planetary Sciences, Harvard University, 20 Oxford St., Cambridge, MA 02138, USA
• Walt Oechel, Department of Biology, San Diego State University, San Diego, CA, USA
• Kyaw Tha Paw U, Atmospheric Science Group, LAWR, UC Davis, 122 Hoagland Hall, Davis, CA 95616, USA
• Kim Pilegaard, Plant Biology and Biogeochemistry Department, Risoe National Laboratory, P.O. Box 49, DK-4000 Roskilde, Denmark
• Ullar Rannik, Department of Physics, University of Helsinki, P.O. Box 9, FIN-00014 Helsinki, Finland
• Corinna Rebmann, Max-Planck-Institut für Biogeochemie, Tatzendpromenade 1a, 07701 Jena, Germany
• Andrew E. Suyker, University of Nebraska - LincolnFollow
• Riccardo Valentini, Department of Forest Environment and Resources, University of Tuscia, I-01100 Viterbo, Italy
• Kell Wilson, NOAA/ATDD, 456 S. Illinois Avenue, Oak Ridge, TN 37831-2456, USA
• Steve Wofsy, Department of Earth and Planetary Sciences, Harvard University, 20 Oxford St., Cambridge, MA 02138, USA

Document Type

Article

Date of this Version

10-21-2002

Comments

Published in Agricultural and Forest Meteorology 113 (2002) 53–74.

Abstract

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 (F_GPP), and ecosystem respiration (F_RE) 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 F_GPP and F_RE 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 F_GPP and F_RE are in phase, in the temperate deciduous and boreal coniferous forests F_RE was delayed compared to F_GPP, resulting in the greatest imbalance between respiratory and assimilatory fluxes early in the growing season.

F_GPP 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 Cm⁻² per day) > temperate conifers, C₃ grassland and crops (5.7–6.9g Cm⁻² per day) > boreal conifers (4.6 g Cm⁻² per day). Annual F_GPP and net ecosystem productivity (F_NEP) decreased across climate zones in the order tropical > temperate > boreal. However, the decrease in F_NEP with latitude was greater than the decrease in F_GPP, indicating a larger contribution of respiratory (especially heterotrophic) processes in boreal systems.