Ozone uptake and effects on transpiration, net photosynthesis, and dark respiration in Scots pine. [Pinus sylvestris L]

Journal Article · Tue Sep 01 04:00:00 EDT 1987 · For. Sci.; (United States)

OSTI ID:5909614

Skaerby, L; Troeng, E; Bostroem, C

Ozone uptake, transpiration, net photosynthesis, and dark respiration were studied in the field by using an open gas exchange system in a 20-year-old stand of Scots pine (Pinus sylvestris L.). A current shoot was treated with ozone concentrations ranging from 120 to 400 ..mu..g x m/sup -3/ during one month. During daytime there was a linear relationship between ozone concentration and ozone uptake, and the deposition rate varied between 0.05 and 0.13 cm x s/sup -1/. Ozone at the highest concentrations seemed to decrease transpiration somewhat during daytime. At night, ozone was taken up only at the highest concentration. Both transpiration and stomatal conductance increased at night when ozone concentration was 250..mu..g x m/sup -3/ and higher. There was no significant influence on the net photosynthetic performance during exposure to ozone. Dark respiration, however, increased throughout the experimental period, and the accumulated respiration was about 60% higher for the ozone-exposed shoot at the end of the experiment.

• Research Organization: Swedish Environmental Research Institute, Goeteborg
• OSTI ID: 5909614
• Journal Information: For. Sci.; (United States), Journal Name: For. Sci.; (United States) Vol. 33:3; ISSN FOSCA
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
BIOLOGICAL EFFECTS
CHEMICAL REACTIONS
CONIFERS
DEPOSITION
ELECTROMAGNETIC RADIATION
FOLIAR UPTAKE
INJURIES
LEAVES
OPENINGS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PINES
PLANTS
POLLUTION
RADIATIONS
STOMATA
SYNTHESIS
TRANSPIRATION
TREES
UPTAKE
VISIBLE RADIATION