Linking flux network measurements to continental scale simulations: ecosystem carbon dioxide exchange capacity under non-water-stressed conditions.
Authors:
Owen, Katherine E. Tenhunen, John Reichstein, Markus Wang, Quan Falge, Eva Geyer, Ralf Xiaos, Xiangming Stoy, Paul Ammann, Christof Arain, Altaf Aubinet, Marc Aurela, Mika Bernhofer, Christian Chojnicki, Bogdan H. Grainier, Andre Gruenwald, Thomas Hadley, Julian Heinesch, Bernard Hollinger, David Knohl, Alexander Kutsch, Werner Lohila, Annalea Meyers, Tilden Moors, Eddy Moureaux, Christine Pilegaard, Kim Saigusa, Nobuko Verma, Shashi Vesala, Timo Vogel, Chris USDA, FS
Source:
Global change biology. 2007 Apr., v. 13, no. 4 Oxford, UK : Blackwell Publishing Ltd, p. 734-760.
NALT Subjects:
carbon dioxide ecosystems forests grasslands wetlands agricultural land tundra climatic factors vegetation leaf area index leaves plant physiology gas exchange simulation models mathematical models geographical variation primary productivity Europe North America Asia
Issue Date:
Apr-2007
Abstract:
This paper examines long-term eddy covariance data from 18 European and 17 North American and Asian forest, wetland, tundra, grassland, and cropland sites under non-water-stressed conditions with an empirical rectangular hyperbolic light response model and a single layer two light-class carboxylase-based model. Relationships according to ecosystem functional type are demonstrated between empirical and physiological parameters, suggesting linkages between easily estimated parameters and those with greater potential for process interpretation. Relatively sparse documentation of leaf area index dynamics at flux tower sites is found to be a major difficulty in model inversion and flux interpretation. Therefore, a simplification of the physiological model is carried out for a subset of European network sites with extensive ancillary data. The results from these selected sites are used to derive a new parameter and means for comparing empirical and physiologically based methods across all sites, regardless of ancillary data. The results from the European analysis are then compared with results from the other Northern Hemisphere sites and similar relationships for the simplified process-based parameter were found to hold for European, North American, and Asian temperate and boreal climate zones. This parameter is useful for bridging between flux network observations and continental scale spatial simulations of vegetation/atmosphere carbon dioxide exchange.
