Abstract
The carbon dioxide and water vapor exchanges of forest canopies can be calculated from the weather using a portfolio of submodels for the canopy processes. This paper considers the submodels necessary to calculate these exchanges on an hourly basis and compares the output of the model with measurements of the canopy exchanges made by the energy balance-Bowen ratio method.
Submodels are required for the temporal and spatial distribution and dynamics within the canopy of leaf area; visible, near-infrared and thermal radiation; boundary layer conductance; stomatal conductance; leaf transpiration and leaf photosynthesis. These submodels should be of an appropriate level of complexity, have an appropriate time step and be as mechanistically realistic as the state of knowledge allows.
The model enables the significance of the different environmental driving variables to be evaluated and shows, for example, the importance of the diffuse fraction of the global radiation. Predictions of the source/sink distribution of carbon dioxide and water vapor fluxes within the canopy are made and these can be compared against measurements made with water vapor and carbon dioxide porometers. Limitations and developments of this approach to understanding productivity and water use are discussed.
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Jarvis, P.G., Miranda, H.S., Muetzelfeldt, R.I. (1985). Modelling Canopy Exchanges of Water Vapor and Carbon Dioxide in Coniferous Forest Plantations. In: Hutchison, B.A., Hicks, B.B. (eds) The Forest-Atmosphere Interaction. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5305-5_31
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DOI: https://doi.org/10.1007/978-94-009-5305-5_31
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