Canopy stomatal conductance

Conference · Fri Jul 14 00:00:00 EDT 1989

OSTI ID:5823531

Baldocchi, D D; Luxmoore, R J; Hatfield, J L

Stomata are major conduits for the diffusion of many trace gas species between leaves and the atmosphere. The role of the stomata on controlling gas exchange between the terrestrial biosphere and the atmosphere at the landscape, meso- and global-scales has only recently been recognized. Further advances in modelling large-scale trace gas exchange will depend on our ability to understand and model stomatal mechanics at the scale of the pertinent sub-unit, which is typically that of the canopy. This paper describes two approaches for estimating canopy stomatal conductance. One approach is based on 'bottom-up' scaling. This approach computes canopy stomatal conductance by integrating detailed leaf-level and environmentally-driven, physiological processes with the use of a detailed canopy micrometeorology model. The other approach is based on 'top-down' scaling. It interprets the integrated canopy stomatal conductance from measured fluxes of trace gas exchange. Frameworks for extending these scaling approaches to non-idea conditions are given. 96 refs., 5 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5823531
• Report Number(s): CONF-8904269-1; ON: DE89016860
• Resource Relation: Conference: Workshop on stomatal conductance, University Park, PA, USA, 11 Apr 1989; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR
INTERACTIONS
BIOSPHERE
STOMATA
BIOLOGICAL FUNCTIONS
BIOLOGICAL EFFECTS
CANOPIES
CARBON DIOXIDE
GASES
TEMPERATURE DEPENDENCE
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ENVIRONMENT
FLUIDS
FUNCTIONS
OPENINGS
OXIDES
OXYGEN COMPOUNDS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)