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Exposing Loblolly Pine Seedlings to Acid Precipitation and Ozone: Effects on Soil Rhizosphere Chemistry
Author(s) -
Ruark G. A.,
Thornton F. C.,
Tiarks A. E.,
Lockaby B. G.,
Chappelka A. H.,
Meldahl R. S.
Publication year - 1991
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1991.00472425002000040020x
Subject(s) - rhizosphere , chemistry , precipitation , soil water , acid rain , loblolly pine , soil ph , bulk soil , agronomy , environmental chemistry , botany , pinus <genus> , soil organic matter , soil science , environmental science , biology , bacteria , physics , genetics , organic chemistry , meteorology
Rhizosphere and nonrhizosphere soils were sampled in association with the roots of field‐grown, 1‐year‐old loblolly pine ( Pinus taeda L.) that had been exposed to simulated acidic precipitation and O 3 treatments. Soil samples adjacent to roots and from the bulk soil were analyzed separately for H, Al 3 , Ca 2 , and Mg 2 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 O 3 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 Al 3 , Ca 2 , or Mg 2 . However, after combining rhizosphere and nonrhizosphere soil samples, Al 3 concentrations were found to generally increase as rain pH decreased, whereas Ca 2 and Mg 2 followed the opposite pattern. No such pattern for O 3 level was apparent. Significant interactions between acid precipitation and O 3 treatments were not detected.