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Exposure to ozone (O 3 ) and changes in soil fertility influence both the metabolism of plant roots and their interaction with rhizosphere organisms. Because one indication of altered root metabolism is a change in belowground respiratory activity, we used specially designed measurement chambers to assess the effects of O 3  and nutrient availability on belowground respiratory activity of potted three-year-old ponderosa pine ( Pinus ponderosa  Dougl. ex Laws.). Seedlings were exposed to a factorial combination of three O 3  treatments and three fertilization treatments in open-top O 3  exposure chambers.

Nutrient availability alters belowground respiration of ozone-exposed ponderosa pine