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Organic soils continue to acidify despite reduction in acidic deposition
Date:1/12/2009

on, the subregion that historically has received the lowest inputs of acid deposition of any of the subregions, showed the greatest declines in exchangeable base cations and base saturation. This area also exhibited the greatest increases in carbon-normalized exchangeable acidity (acidityN) and AlN and was the only subregion to experience a statistically significant decrease in pH. Lead author Richard Warby explained, "It is possible that the acidification of soils in this subregion was delayed relative to the other subregions because of the strong regional gradient in acidic inputs from west to east."

The researchers believe that the observed trend in soil acidification is likely to continue until acidic inputs decline to the point where soil base cation pools are sufficient to neutralize them. Warby concluded, "Until then we are likely to see the continued sluggish chemical recovery of surface waters and a continuing threat to the health of forests, with additional declines in base status likely to increase the number of sites exhibiting lower forest productivity and or vulnerability to winter injury."


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Contact: Sara Uttech
suttech@soils.org
608-268-4948
Soil Science Society of America
Source:Eurekalert

Page: 1 2

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