Effects of acidic rain and ozone on nitrogen fixation and photosynthesis in the lichen lobaria pulmonaria (L. ) Hoffm
The lichen Lobaria pulmonaria was subjected to ozone fumigations at 118, 235 and 353 mcg/cu m and simulated acidic rain at pH levels of 2.6, 4.2 and 5.6 for 5 days (M,W,F,M,W) during a 10-day period. Acidic rain at pH 2.6 caused significant reduction in nitrogen fixation and gross photosynthesis of 100 and 90%, respectively, and thallus bleaching was apparent. There were no significant differences between the pH 5.6 and 4.2 treatments in either gross photosynthesis or nitrogen fixation, and the color of the lichen thalli was unchanged. The effect of ozone on nitrogen fixation and photosynthesis over the range of concentrations used was not significant, but there was a trend toward reduced nitrogen fixation with increasing O/sub 3/ concentration. There were no significant ozone-acidic rain interactions. The threshold for response to rain acidity for L. pulmonaria lies between pH 2.6 and 4.2, and the acidity of wet deposition in parts of the United States may fall in the range.
- Research Organization:
- Oak Ridge National Lab., TN (USA). Environmental Sciences Div.
- OSTI ID:
- 5881585
- Report Number(s):
- PB-88-104294/XAB
- Resource Relation:
- Other Information: Pub. in Environmental and Experimental Botany, Vol. 26, No. 1, 59-64(Jan-Mar 1986)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACID RAIN
BIOLOGICAL EFFECTS
LICHENS
ENVIRONMENTAL IMPACTS
NITROGEN FIXATION
OZONE
ACIDIFICATION
AIR QUALITY
NAPAP
PHOTOSYNTHESIS
WASHOUT
ALGAE
ATMOSPHERIC PRECIPITATIONS
CHEMICAL REACTIONS
ENVIRONMENTAL QUALITY
FUNGI
PHOTOCHEMICAL REACTIONS
PLANTS
PRECIPITATION SCAVENGING
RAIN
SEPARATION PROCESSES
SYNTHESIS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
560300 - Chemicals Metabolism & Toxicology