Record Display for the EPA National Library Catalog

RECORD NUMBER: 8 OF 18

OLS Field Name OLS Field Data
Main Title Nutrient Leaching from Conifer Needles in Relation to Foliar Apoplast Cation Exchange Capacity.
Author Turner, D. P. ; van Broekhuizen, H. J. ;
CORP Author Corvallis Environmental Research Lab., OR. ;Agricultural Univ., Wageningen (Netherlands).;NSI Technology Services Corp., Corvallis, OR. Environmental Research Lab.
Publisher c1992
Year Published 1992
Report Number EPA/600/J-92/081;
Stock Number PB92-153378
Additional Subjects Forest trees ; Softwoods ; Air pollution effects(Plants) ; Acid rain ; Leaching ; Cation exchanging ; Nutrients ; Conifers ; Seedlings ; Spruces ; Fir trees ; Pseudotsuga menziesii ; Picea engelmanii
Holdings
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Status
NTIS  PB92-153378 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 08/28/1992
Collation 6p
Abstract
Limited evidence to date suggests that acidic precipitation promotes leaching of nutrient cations from conifer foliage. In order to evaluate the relative contribution of the apoplast cation exchange complex and symplast nutrient pools to the leached ions, the magnitude of potential foliar leaching in response to acidic precipitation was compared to foliar apoplast cation exchange capacity (CEC) for two conifer tree species (Pseudotsuga menziesii and Picea engelmanii). Leaching increased with decreasing pH and increasing time of immersion. At pH 2.1 and 3.1, equivalents of H+ depleted from the acidic solutions approximated equivalent of cations gained by the solutions. Maximum amounts leached were less than 40 micro equiv/g dry weight of needles for all ions combined. Measured foliar apoplast CEC for these species was approximately 120 micro equiv/g dry weight of needles. These relative magnitudes indicated that the apoplast provided the leached ions.