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- W191924342 abstract "Young loblolly pine trees were exposed to ozone at below to above ambient concentrations in open-top chambers at a study site in the Piedmont of North Carolina. Seasonal dynamics of N, P, K, Ca, Mg, and starch were determined from foliage sampled at 3 week intervals during the first growing season and at six week intervals in succeeding seasons. Nutrient concentrations were generally higher in later flushes and in higher ozone treatments but the differences were significant only for K (200-300% of control) in first and second flush foliage during the first summer and for N (120-150% of control) in the second and third flush foliage in the first fall. Starch concentrations were not significantly affected until the following spring when higher ozone treatments had lower starch reserves ([approximately]50% of control). The seasonal patterns of accumulation and loss appear to have been affected by early abscission of foliage. Late season flushes in high ozone treatments showed accumulation of N when first flush foliage was abscising. Starch levels declined sharply prior to ozone induced premature abscission in the high ozone treatments and may have indicated the level of damage to the photosynthetic apparatus that led to premature abscission." @default.
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- W191924342 date "1993-06-01" @default.
- W191924342 modified "2023-09-28" @default.
- W191924342 title "Effects of ozone on seasonal nutrient and starch dynamics in foliage of young loblolly pine" @default.
- W191924342 hasPublicationYear "1993" @default.
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