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Journal of Environmental Quality Abstract -

Exposing Loblolly Pine Seedlings to Acid Precipitation and Ozone: Effects on Soil Rhizosphere Chemistry


This article in JEQ

  1. Vol. 20 No. 4, p. 828-832
    Received: Nov 1, 1990

    * Corresponding author(s):
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  1. G. A. Ruark,
  2. F. C. Thornton,
  3. A. E. Tiarks,
  4. B. G. Lockaby *,
  5. A. H. Chappelka and
  6. R. S. Meldahl
  1. USDA-FS, 3041 Cornwallis Road, P.O. Box 12254, Research Triangle Park, NC 27709;
    TVA, Muscle Shoals, AL 35660;
    USDA-FS, Pineville, LA 71360;
    School of Forestry, M. White Smith Hall, Auburn University, AL 36849-5418.



Rhizosphere and nonrhizosphere soils were sampled in association with the roots of field-grown, l-year-old loblolly pine (Pinus taeda L.) that had been exposed to simulated acidic precipitation and O3 treatments. Soil samples adjacent to roots and from the bulk soil were analyzed separately for H, Al3, Ca2, and Mg2 concentrations. For the acid precipitation treatment, H levels were significantly greater in the rhizophere compared with the bulk soil, but no clear trend could be attributed to acidic precipitation levels. Hydrogen ion concentrations associated with the O3 levels, at times, differed significantly by treatment, butnot between rhizosphere and bulk soil. Rain pH and 3 level produced no statistically significant distinction between rhizosphere and nonrhizosphere soil for Al3, Ca2, or Mg2. However, after combining rhizosphere and nonrhizosphere soil samples, Al3 concentrations were found to generally increase as rain pH decreased, whereas Ca2 and Mg2 followed the opposite pattern. No such pattern for O3 level was apparent. Significant interactions between acid precipitation and O3 treatments were not detected.

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