Citation:

Turner, D. AND D. Tingey. FOLIAR LEACHING AND ROOT UPTAKE OF CA, MG, AND K IN RELATION TO ACID FOG EFFECTS ON DOUGLAS-FIR. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/069 (NTIS PB90245242).

Description:

The impact of acid fog on foliar leaching and root uptake of Ca, Mg, and K by Douglas-fir (Pseudotsuga menziesii) seedlings was examined. n a factorial experiment, 1-year old seedlings were grown in 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. hroughfall 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. hroughfall 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. he amounts of nutrients coming off of the foliage with the low pH fog were small relative to the daily uptake rates. oliar concentrations of K and Mg at the end of the exposures were lower under the low nutrient regime but were not effected by fog pH. omparisons of wax weight and examinations of epicuticular wax by electron microscopy did not indicate a significant impact from exposure to the low pH fog.

URLs/Downloads:

Record Details:

Document IDs: