Skip to main content
U.S. flag

An official website of the United States government

Early indications of soil recovery from acidic deposition in U.S. red spruce forests

January 1, 2013

Forty to fifty percent decreases in acidic deposition through the 1980s and 1990s led to partial recovery of acidified surface waters in the northeastern United States; however, the limited number of studies that have assessed soil change found increased soil acidification during this period. From existing data, it's not clear whether soils continued to worsen in the 1990s or if recovery had begun. To evaluate possible changes in soils through the 1990s, soils in six red spruce (Picea rubens Sarg.) stands in New York, Vermont, New Hampshire, and Maine, first sampled in 1992 to 1993, were resampled in 2003 to 2004. The Oa-horizon pH increased (P < 0.01) at three sites, was marginally higher (P < 0.1) at one site, and lower (P < 0.05) at the New York site. Total C concentrations in Oa horizons decreased (P < 0.05) at sites where the pH increased, but the cause is uncertain. Exchangeable Al concentrations in Oa horizons decreased (P < 0.05) 20 to 40% at all sites except New York, which showed no change. The Al decrease can be attributed to decreased deposition of SO42−, which decreased the mobility of Al throughout the upper soil profile. Results indicate a nascent recovery driven largely by vegetation processes.

Citation Information

Publication Year 2012
Title Early indications of soil recovery from acidic deposition in U.S. red spruce forests
DOI 10.2136/sssaj2011.0415
Authors Gregory B. Lawrence, Walter C. Shortle, Mark B. David, Kevin T. Smith, Richard A.F. Warby, Andrei G. Lapenis
Publication Type Article
Publication Subtype Journal Article
Series Title Soil Science Society of America Journal
Series Number
Index ID 70043701
Record Source USGS Publications Warehouse
USGS Organization New York Water Science Center

Related Content