HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Johnson, D. W. Articles by Swank, W. T. Search for Related Content PubMed Articles by Johnson, D. W. Articles by Swank, W. T. Agricola Articles by Johnson, D. W. Articles by Swank, W. T.

Simulated Effects of Reduced Sulfur, Nitrogen, and Base Cation Deposition on Soils and Solutions in Southern Appalachian Forests

Desert Research Inst., 2215 Raggio Parkway, Reno, NV 89512;

R. B. Susfalk

Environmental and Resource Sciences, Univ. of Nevada, Reno, NV 89512;

P. F. Brewer

Tennessee Valley Authority, Chattanooga, TN 37402;

W. T. Swank

U.S. Forest Service, Coweeta Hydrologic Lab., Otto, NC 28763.

^* Corresponding author (dwj{at}dri.edu).

ABSTRACT

Effects of reduced deposition of N, S, and C_B on nutrient pools, fluxes, soil, and soil solution chemistry were simulated for two Appalachian forest ecosystems using the nutrient cycling model. In the extremely acidic, N- and S-saturated red spruce [Picea rubens (Sarg.)] forest (Nolan Divide), reducing C_B deposition by 50% reduced C_B leaching by 40% during the 24-yr simulation period. This was due solely to the effects of C_B deposition on the soil exchanger rather than effects on soil solution. Reducing S and N by 50% caused immediate reductions in total anion and cation leaching at Nolan Divide, but the effects on soil solution C_B diminished and C_B leaching was reduced by only 17% over the simulation period. Reducing S and N deposition had a greater effect on soil solution aluminum (Al) and molar Ca/Al ratio than reducing base cation deposition at Nolan Divide. In the moderately acidic, N- and S-accumulating mixed deciduous forest at Coweeta, reduced C_B deposition by 50% caused a very slight (<4%) reduction in C_B leaching as a result of slightly reduced base saturation and increased soil sulfate adsorption. The effects on reducing S and N deposition by 50% on C_B leaching (16% over the simulation period) were greater than those of reduced C_B deposition. The system continued to accumulate both S and N even at reduced deposition at Coweeta, although growth and vegetation uptake were slightly reduced (–5%) because of increased N deficiency. Base saturation remained well above the Al buffering range at all times at Coweeta and Al was an unimportant component of soil solutions in all scenarios.

This article has been cited by other articles:

				K. J. Elliott, J. M. Vose, J. D. Knoepp, D. W. Johnson, W. T. Swank, and W. Jackson Simulated Effects of Sulfur Deposition on Nutrient Cycling in Class I Wilderness Areas J. Environ. Qual., June 23, 2008; 37(4): 1419 - 1431. [Abstract] [Full Text] [PDF]