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Main Title Foliar Leaching and Root Uptake of Ca, Mg and K in Relation to Acid Fog Effects on Douglas-Fir.
Author Turner, D. P. ; Tingey., D. T. ;
CORP Author Corvallis Environmental Research Lab., OR. ;NSI Technology Services Corp., Corvallis, OR.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/069;
Stock Number PB90-245242
Additional Subjects Fog ; Acidification ; Fir trees ; Plant ecology ; Nutrients ; pH ; Leaching ; Exposure ; Plant growth ; Experimental design ; Vegetation ; Forestry ; Reprints ; Air pollution effects(Plants) ; Root adsorption ; Environmental effects ; Acid rain
Library Call Number Additional Info Location Last
NTIS  PB90-245242 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 12p
The impact of acid fog on foliar leaching and root uptake of Ca, Mg, and K by Douglas-fir (Pseudotsuga menziesii) seedlings was examined. In a factorial experiment, 1-year old seedlings were grown in a solution culture at two levels of nutrient availability (low and moderate) and exposed twice a week (4 hr per event) for 12 weeks to fog at pH 5.6 or pH 3.1. Throughfall enrichment of Ca, Mg and K was determined from drip collectors at the base of each seedling and root uptake rates for trees under the moderate nutrient regime were evaluated by monitoring nutrient solution depletion. Throughfall enrichment was higher in the pH 3.1 fog than the pH 5.6 fog but much of the enrichment appeared to be wash off of precipitate from previous fogs. The amounts of nutrients coming off of the foliage with the low pH fog were small relative to the daily uptake rates. Foliar concentrations of K and Mg at the end of the exposures were lower under the low nutrient regime but were not affected by fog pH. Comparisons of wax weight and examinations of epicuticular wax by electron microscopy did not indicate a significant impact from exposure to the low pH fog. (Copyright (c) 1990 Kluwer Academic Publishers.)