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TheScientificWorldJOURNAL - Volume 7 2007, Pages 175-180

Short Communication

Department of Environmental Sciences, University of California, Riverside, CA, USA

USDA Forest Service, Pacific Southwest Research Station, Riverside, CA, USA

Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ, USA

USDA-ARS George E.
Brown, Jr.
Salinity Laboratory, Riverside, CA, USA

Department of Botany and Plant Sciences, University of California, Riverside, CA, USA

Received 3 October 2006; Revised 5 February 2007; Accepted 6 February 2007

Academic Editor: Andrzej Bytnerowicz

Copyright © 2007 Yvonne A.
Wood et al.


Abstract

We report the rapid acidification of forest soils in the San Bernardino Mountains of southern California.
After 30 years, soil to a depth of 25 cm has decreased from a pH measured in 0.01 M CaCl2 of 4.8 to 3.1.
At the 50-cm depth, it has changed from a pH of 4.8 to 4.2.
We attribute this rapid change in soil reactivity to very high rates of anthropogenic atmospheric nitrogen N added to the soil surface 72 kg ha–1 year–1 from wet, dry, and fog deposition under a Mediterranean climate.
Our research suggests that a soil textural discontinuity, related to a buried ancient landsurface, contributes to this rapid acidification by controlling the spatial and temporal movement of precipitation into the landsurface.
As a result, the depth to which dissolved anthropogenic N as nitrate NO3 is leached early in the winter wet season is limited to within the top ~130 cm of soil where it accumulates and increases soil acidity.





Autor: Yvonne A.
Wood, Mark Fenn, Thomas Meixner, Peter J.
Shouse, Joan Breiner, Edith Allen, and Laosheng Wu


Fuente: https://www.hindawi.com/



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