Transpiration's inhibition of air pollution fluxes to substomatal cavities. [PRECP]

Conference · Fri May 01 04:00:00 EDT 1987

OSTI ID:5609240

Slinn, W G.N.

This report presents an estimate for the resistance to transport through stomatal openings, accounting for the counterflowing flux of water vapor associated with transpiration. The specific goal of this report is to estimate the influence of transpiration on the stomatal resistance, r/sub sto/; others have estimated the substomatal and mesophyll resistances r/sub ssc/ and r/sub mes/. It might be expected that any influence of the water-vapor flux on pollutant transport would be a maximum at the stomatal opening since, at the constricted area of the stoma, the water flux is a maximum. Transpiration through stomata appears to insigifnicantly inhibit the passage of relatively small molecules (e.g., SO/sub 2/, O/sub 3/, HNO/sub 3/, PAN, etc.) through the stomata, and therefore, by entering the substomatal cavity, such pollutants have greater potential for threatening plan survival, if their concentrations are excessive. 7 refs., 5 figs.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5609240
• Report Number(s): PNL-SA-14990; CONF-8709149-2; ON: DE88003401
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560300 -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACID RAIN
AIR FLOW
AIR POLLUTION
ATMOSPHERIC PRECIPITATIONS
BIOLOGICAL EFFECTS
BIOLOGICAL PATHWAYS
BIOPHYSICS
DIFFUSION
FLUID FLOW
FLUIDS
GAS FLOW
GASES
GROWTH
LEAVES
MATHEMATICAL MODELS
NAPAP
OPENINGS
PLANT GROWTH
POLLUTION
RAIN
STOMATA
TRANSPIRATION
VAPORS
WATER VAPOR