Rapid Recent Recovery from Acidic Deposition in Central Ontario Lakes

被引:14
|
作者
Watmough, Shaun A. [1 ]
Eimers, M. Catherine [1 ]
机构
[1] Trent Univ, Trent Sch Environm, Peterborough, ON K9L 0G2, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
acidification; sulphate; lakes; recovery; base cations; dissolved organic carbon; DISSOLVED ORGANIC-CARBON; SOUTHEASTERN CANADA; FORESTED CATCHMENTS; SPATIAL-PATTERNS; WATER CHEMISTRY; BASE CATIONS; ACIDIFICATION; TRENDS; SULFATE; CLIMATE;
D O I
10.3390/soilsystems4010010
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
In many regions, chemical recovery in lakes from acidic deposition has been generally slower than expected due to a variety of factors, including continued soil acidification, climate-induced sulphate (SO4) loading to lakes and increases in organic acidity. In central Ontario, Canada, atmospheric sulphur (S) deposition decreased by approximately two-thirds between 1982 and 2015, with half of this reduction occurring between 2005 and 2015. Chemical recovery in the seven lakes was limited prior to 2005, with only small increases in pH, Gran alkalinity and charge-balance ANC (acid-neutralizing capacity). This was because lake SO4 concentrations closely followed changes in S deposition, and decreases in base cation concentration closely matched declines in SO4. However, decreases in S deposition and lake SO4 were more pronounced post-2005, and much smaller decreases in lake base cation concentrations relative to SO4 resulted in large and rapid increases in pH, alkalinity and ANC. Dissolved organic carbon concentrations in lakes increased over the study period, but had a limited effect on lake recovery. Clear chemical recovery of these lakes only occurred after 2005, coinciding with a period of dramatic declines in S deposition.
引用
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页码:1 / 12
页数:12
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