Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    We will mail you new results for this query: keywords==daily canopy photosynthesis
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Linking flux network measurements to continental scale simulations: ecosystem carbon dioxide exchange capacity under non-water-stressed conditions
Owen, K.E. ; Tenhunen, J. ; Reichstein, M. ; Wang, Q. ; Falge, E. ; Geyer, R. ; Xiao, X. ; Stoy, P. ; Ammann, C. ; Arain, A. ; Aubinet, M. ; Aurela, M. ; Bernhofer, C. ; Chojnicki, B.H. ; Granier, A. ; Gruenwald, T. ; Hadley, J. ; Heinesch, B. ; Hollinger, D. ; Knohl, A. ; Kutsch, W. ; Lohila, A. ; Meyers, T. ; Moors, E.J. ; Moureaux, C. ; Pilegaard, K. ; Saigusa, N. ; Verma, S. ; Vesala, T. ; Vogel, C. - \ 2007
Global Change Biology 13 (2007)4. - ISSN 1354-1013 - p. 734 - 760.
kooldioxide - eddy-covariantie - netto ecosysteem uitwisseling - gewassen - bossen - graslanden - wetlands - carbon dioxide - eddy covariance - net ecosystem exchange - crops - forests - grasslands - northern temperate grassland - gross primary production - atmosphere co2 exchange - eddy-covariance measurements - daily canopy photosynthesis - danish beech forest - leaf-area index - rain-fed maize - long-term - process model
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
Optimal Photosynthetic Characteristics of Individual Plants in Vegetation Stands and Implications for Species Coexistence
Anten, N.P.R. - \ 2005
Annals of Botany 95 (2005)3. - ISSN 0305-7364 - p. 495 - 506.
nitrogen-use efficiency - daily canopy photosynthesis - leaf-area indexes - carbon gain - multispecies canopy - biomass allocation - xanthium-canadense - growth-rate - c-3 plants - light
Aims This paper reviews the way optimization theory has been used in canopy models to analyse the adaptive significance of photosynthesis-related plant characteristics and their consequences for the structure and species composition of vegetation stands. Scope In most studies simple optimization has been used with trait values optimal when they lead to maximum whole-stand photosynthesis. This approach is subject to the condition that the optimum for one individual is independent of the characteristics of its neighbours. This seems unlikely in vegetation stands where neighbour plants strongly influence each other's light climate. Not surprisingly, there are consistent deviations between predicted plant traits and real values: plants tend to be taller, distribute nitrogen more evenly among their leaves and produce more leaf area which is projected more horizontally than predicted by models. Conclusions By applying game theory to individual plant-based canopy models, other studies have shown that optimal vegetation stands with maximum whole-stand photosynthesis are not evolutionarily stable. They can be successfully invaded by mutants that are taller, project their leaves more horizontally or that produce greater than optimal leaf areas. While these individual-based models can successfully predict the canopy structure of vegetation stands. they are invariably determined at unique optimal trait values. They do not allow for the co-existence of more than one species with different characteristics. Canopy models can contribute to our understanding of species coexistence through (a) simultaneous analysis of the various traits that determine light capture and photosynthesis and the trade-offs between them, and (b) consideration of trade-offs associated with specialization to different positions in the niche space defined by temporal and spatial heterogeneity of resources. (C) 2004 Annals of Botany Company.
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