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Concentration-Dependent Effects of Ozone on Translocation of Assimilates in Douglas Fir

Institute for Soil Fertility Research, P.O. Box 48, 6700 AA Wageningen, the Netherlands.

^* Corresponding author.

ABSTRACT

The assessment of air quality standards for forest ecosystems requires proper knowledge about concentration-effect relations of air pollutants for tree species. In this study, 2-yr-old Douglas fir seedlings [Pseudotsuga menziesii (Mirb.) Franco] were exposed to 23, 81, and 169 µg O₃/m³ during 8 h/d, 5 d/wk for a period of 4 wk. After exposure, the trees were placed in an atmosphere containing ¹⁴CO₂. Release of ¹⁴CO₂ in the root/soil compartment was analyzed once a day and was regarded as an index of transport and utilization of ¹⁴C photosynthates. Respiratory release of ¹⁴C was temporarily inhibited by O₃ during the first days following exposure to the air pollutant. Within 2 wk after the O₃ treatment, ¹⁴CO₂ in the root/soil respiration was the same in all treatments, indicating that trees were recovering from O₃ injury.

This work was part of project 86 of the Dutch National Program on Acid Rain.

Received for publication October 23, 1989.