Journal ArticleDOI
Scaling carbon dioxide and water vapour exchange from leaf to canopy in a deciduous forest. II. Model testing and application
Dennis D. Baldocchi,Peter Harley +1 more
TLDR
In this paper, the scaling of CO 2 and water vapour transfer from leaf to canopy dimensions was achieved by integrating mechanistic models for physiological (photosynthesis, stomatal conductance and soil/root and bole respiration) and micrometeorological (radiative transfer, turbulent transfer and surface energy exchanges) processes.Abstract:
The scaling of CO 2 and water vapour transfer from leaf to canopy dimensions was achieved by integrating mechanistic models for physiological (photosynthesis, stomatal conductance and soil/root and bole respiration) and micrometeorological (radiative transfer, turbulent transfer and surface energy exchanges) processes. The main objectives of this paper are to describe a canopy photosynthesis and evaporation model for a temperate broadleaf forest and to test it against field measurements. The other goal of this paper is to use the validated model to address some contemporary ecological and physiological questions concerning the transfer of carbon and water between forest canopies and the atmosphere. In particular, we examine the role of simple versus complex radiative transfer models and the effect of environmental (solar radiation and CO 2 ) and ecophysiological (photosynthetic capacity) variables on canopy-scale carbon and water vapour fluxes.read more
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Journal ArticleDOI
Comparing global models of terrestrial net primary productivity (NPP): overview and key results
Wolfgang Cramer,David W. Kicklighter,Alberte Bondeau,Berrien Moore,Galina Churkina,Galina Churkina,B. Nemry,Anne Ruimy,Annette L. Schloss +8 more
TL;DR: A comparison of 17 global models of terrestrial biogeochemistry with respect to annual and seasonal fluxes of net primary productivity (NPP) for the land biosphere is presented in this article.
Journal ArticleDOI
The carbon balance of tropical, temperate and boreal forests
TL;DR: In this article, the carbon balance of forests is determined by a number of component processes of carbon acquisition and carbon loss, and a small shift in the magnitude of these processes would have a large impact on the global carbon cycle.
Journal ArticleDOI
Advantages of diffuse radiation for terrestrial ecosystem productivity
Lianhong Gu,Dennis D. Baldocchi,Shashi B. Verma,T. A. Black,Timo Vesala,Eva Falge,Pete R. Dowty +6 more
TL;DR: In this paper, the authors compared the relative efficiencies of canopy photosynthesis to diffuse and direct photosynthetically active radiation (PAR) for a Scots pine forest, an aspen forest, a mixed deciduous forest and a tallgrass prairie.
Journal ArticleDOI
A model separating leaf structural and physiological effects on carbon gain along light gradients for the shade‐tolerant species Acer saccharum
Ülo Niinemets,John Tenhunen +1 more
TL;DR: A process-based leaf gas exchange model for C3 plants was developed which specifically describes the effects observed along light gradients of shifting nitrogen investment in carboxylation and bioenergetics and modified leaf thickness due to altered stacking of photosynthetic units.
Journal ArticleDOI
A two-leaf model for canopy conductance, photosynthesis and partitioning of available energy I:: Model description and comparison with a multi-layered model
Ying-Ping Wang,Ray Leuning +1 more
TL;DR: In this article, a two-leaf model was proposed to predict net photosynthesis, latent and sensible heat fluxes of a canopy quite accurately under a wide range of soil water availability and meteorological conditions, as compared with the multi-layer model.
References
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Book
An Introduction to Boundary Layer Meteorology
TL;DR: In this article, the boundary layer is defined as the boundary of a boundary layer, and the spectral gap is used to measure the spectral properties of the boundary layers of a turbulent flow.
Journal ArticleDOI
Some relationships between the biochemistry of photosynthesis and the gas exchange of leaves.
TL;DR: It was found that the response of the rate of CO2 Assimilation to irradiance, partial pressure of O2, p(O2), and temperature was different at low and high intercellular p(CO2), suggesting that CO2 assimilation rate is governed by different processes at lowand high inter cellular p (CO2).
Journal ArticleDOI
Stomatal conductance and photosynthesis
TL;DR: Under optimal conditions, the most outstanding genotype was ICS-1, both in plant height, number of leaves, and stomatal conductance, this being proof that this genotype develops excellently and stands out if it has the right conditions and water availability.
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The Interpretation of the Variations in Leaf Water Potential and Stomatal Conductance Found in Canopies in the Field
TL;DR: In this paper, the stomatal conductance of illuminated leaves is a function of current levels of temperature, vapour pressure deficit, leaf water potential (really turgor pressure) and ambient CO $_2$ concentration and when plotted against any one of these variables a scatter diagram results.
Journal ArticleDOI
Physiological and environmental regulation of stomatal conductance, photosynthesis and transpiration: a model that includes a laminar boundary layer
TL;DR: In this article, a system of models for the simulation of gas and energy exchange of a leaf of a C3 plant in free air is presented, where the physiological processes are simulated by sub-models that: (a) give net photosynthesis (An) as a function of environmental and leaf parameters and stomatal conductance (gs); (b) give g, as well as the concentration of CO2 and H2O in air at the leaf surface and the current rate of photosynthesis of the leaf.