TY - JOUR
T1 - Phase and amplitude of ecosystem carbon release and uptake potentials as derived from FLUXNET measurements
AU - Falge, Eva
AU - Tenhunen, John
AU - Baldocchi, Dennis
AU - Aubinet, Marc
AU - Bakwin, Peter
AU - Berbigier, Paul
AU - Bernhofer, Christian
AU - Bonnefond, Jean Marc
AU - Burba, George
AU - Clement, Robert
AU - Davis, Kenneth J.
AU - Elbers, Jan A.
AU - Falk, Matthias
AU - Goldstein, Allen H.
AU - Grelle, Achim
AU - Granier, André
AU - Grünwald, Thomas
AU - Gumundsson, Jón
AU - Hollinger, David
AU - Janssens, Ivan A.
AU - Keronen, Petri
AU - Kowalski, Andrew S.
AU - Katul, Gabriel
AU - Law, Beverly E.
AU - Malhi, Yadvinder
AU - Meyers, Tilden
AU - Monson, Russell K.
AU - Moors, Eddy
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 - Thorgeirsson, Halldor
AU - Tirone, Giampiero
AU - Turnipseed, Andrew
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 Programme, R and 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 - As length and timing of the growing season are major factors explaining differences in carbon exchange of ecosystems, we analyzed seasonal patterns of net ecosystem carbon exchange (FNEE) using eddy covariance data of the FLUXNET data base (http://www-eosdis.ornl.gov/FLUXNET). The study included boreal and temperate, deciduous and coniferous forests, Mediterranean evergreen systems, rainforest, native and managed temperate grasslands, tundra, and C3 and C4 crops. Generalization of seasonal patterns are useful for identifying functional vegetation types for global dynamic vegetation models, as well as for global inversion studies, and can help improve phenological modules in SVAT or biogeochemical models. The results of this study have important validation potential for global carbon cycle modeling. The phasing of respiratory and assimilatory capacity differed within forest types: for temperate coniferous forests seasonal uptake and release capacities are in phase, for temperate deciduous and boreal coniferous forests, release was delayed compared to uptake. According to seasonal pattern of maximum nighttime release (evaluated over 15-day periods, Fmax) the study sites can be grouped in four classes: (1) boreal and high altitude conifers and grasslands; (2) temperate deciduous and temperate conifers; (3) tundra and crops; (4) evergreen Mediterranean and tropical forests. Similar results are found for maximum daytime uptake (Fmin) and the integral net carbon flux, but temperate deciduous forests fall into class 1. For forests, seasonal amplitudes of Fmax and Fmin increased in the order tropical < Mediterranean and temperate coniferous < temperate deciduous and boreal forests, and the pattern seems relatively stable for these groups. The seasonal amplitudes of Fmax and Fmin are largest for managed grasslands and crops. Largest observed values of Fmin varied between -48 and -2 μmol m-2 s-1, decreasing in the order C4-crops > C3-crops > temperate deciduous forests > temperate conifers > boreal conifers > tundra ecosystems. Due to data restrictions, our analysis centered mainly on Northern Hemisphere temperate and boreal forest ecosystems. Grasslands, crops, Mediterranean ecosystems, and rainforests are under-represented, as are savanna systems, wooded grassland, shrubland, or year-round measurements in tundra systems. For regional or global estimates of carbon sequestration potentials, future investigations of eddy covariance should expand in these systems.
AB - As length and timing of the growing season are major factors explaining differences in carbon exchange of ecosystems, we analyzed seasonal patterns of net ecosystem carbon exchange (FNEE) using eddy covariance data of the FLUXNET data base (http://www-eosdis.ornl.gov/FLUXNET). The study included boreal and temperate, deciduous and coniferous forests, Mediterranean evergreen systems, rainforest, native and managed temperate grasslands, tundra, and C3 and C4 crops. Generalization of seasonal patterns are useful for identifying functional vegetation types for global dynamic vegetation models, as well as for global inversion studies, and can help improve phenological modules in SVAT or biogeochemical models. The results of this study have important validation potential for global carbon cycle modeling. The phasing of respiratory and assimilatory capacity differed within forest types: for temperate coniferous forests seasonal uptake and release capacities are in phase, for temperate deciduous and boreal coniferous forests, release was delayed compared to uptake. According to seasonal pattern of maximum nighttime release (evaluated over 15-day periods, Fmax) the study sites can be grouped in four classes: (1) boreal and high altitude conifers and grasslands; (2) temperate deciduous and temperate conifers; (3) tundra and crops; (4) evergreen Mediterranean and tropical forests. Similar results are found for maximum daytime uptake (Fmin) and the integral net carbon flux, but temperate deciduous forests fall into class 1. For forests, seasonal amplitudes of Fmax and Fmin increased in the order tropical < Mediterranean and temperate coniferous < temperate deciduous and boreal forests, and the pattern seems relatively stable for these groups. The seasonal amplitudes of Fmax and Fmin are largest for managed grasslands and crops. Largest observed values of Fmin varied between -48 and -2 μmol m-2 s-1, decreasing in the order C4-crops > C3-crops > temperate deciduous forests > temperate conifers > boreal conifers > tundra ecosystems. Due to data restrictions, our analysis centered mainly on Northern Hemisphere temperate and boreal forest ecosystems. Grasslands, crops, Mediterranean ecosystems, and rainforests are under-represented, as are savanna systems, wooded grassland, shrubland, or year-round measurements in tundra systems. For regional or global estimates of carbon sequestration potentials, future investigations of eddy covariance should expand in these systems.
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U2 - 10.1016/S0168-1923(02)00103-X
DO - 10.1016/S0168-1923(02)00103-X
M3 - Article
AN - SCOPUS:0037010659
SN - 0168-1923
VL - 113
SP - 75
EP - 95
JO - Agricultural and Forest Meteorology
JF - Agricultural and Forest Meteorology
IS - 1-4
ER -