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Effects of forest fire and drought on acidity of a base-poor boreal forest stream: similarities between climatic warming and acidic precipitation

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Abstract

In a boreal forest catchment in the Experimental Lakes Area in northwestern Ontario, wildfire caused an increase in the concentrations of strong acid anions and base cations of the stream. In the naturally base-poor Northwest (NW) Subbasin, a 1980 wildfire caused exports of strong acid anions to increase more than export of base cations, causing a 2.5 fold increase in the acidity of the stream. Mean annual stream pH declined from 5.15 prior to fire to 4.76 two years after fire. Acid-neutralizing capacity (ANC), calculated as the difference between total base cations and strong acid anions, decreased to 20% of pre-fire values. Sulfate and chloride were the strong acid anions responsible for the decline in ANC, increasing four-fold. While nitrate increased eleven-fold, concentrations were too low to significantly affect ANC. There was a significant correlation between weekly sulfate concentration and base cation concentration (r 2 = 0.83) in the two years after fire. Recovery of ANC was caused by the more rapid decline in concentration of sulfate than by changes in base cations. Drought produced a similar but weaker response than fire, with increased sulfate concentrations and decreased stream pH. Climatic warming that increases drought and fire frequency would have effects that mimic the impacts of acidic precipitation (i.e. higher sulfate concentrations and acidic stream waters). Areas which have higher concentrations of stored S from past acid precipitation or have large areas of peatlands in the watershed may have aggravated losses of S and H+ after drought and fire.

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Authors and Affiliations

  1. Department of Fisheries and Oceans, Freshwater Institute, 501 University Crescent, Winnipeg, Manitoba, R3T 2N6, Canada

    M. P. Stainton & K. G. Beaty

  2. Department of Botany, University of Alberta, T6G 2E9, Edmonton, Alberta, Canada

    S. E. Bayley

  3. Department of Zoology and Botany, University of Alberta, T6G 2E9, Edmonton, Alberta, Canada

    D. W. Schindler & B. R. Parker

Authors
  1. S. E. Bayley
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  2. D. W. Schindler
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  3. B. R. Parker
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  4. M. P. Stainton
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  5. K. G. Beaty
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Bayley, S.E., Schindler, D.W., Parker, B.R. et al. Effects of forest fire and drought on acidity of a base-poor boreal forest stream: similarities between climatic warming and acidic precipitation. Biogeochemistry 17, 191–204 (1992). https://doi.org/10.1007/BF00004041

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  • DOI: https://doi.org/10.1007/BF00004041

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