Skip to Main Content
Deposition and processing of airborne nitrogen pollutants in mediterranean-type ecosystems of southern CaliforniaAuthor(s): Philip J. Riggan; Robert N. Lockwood; Ernest N. Lopez
Source: Environ. Sci. Technol.19(9): pp 781–789
Publication Series: Scientific Journal (JRNL)
PDF: Download Publication (2.53 MB)
DescriptionAtmospheric nitrogen deposition, associated with chronic urban air pollution, has produced stream water nitrate concentrations as high as 7.0 mg of N L-l in chaparral watersheds in the San Gabriel Mountains of Los Angeles County, CA. Stream water [NO3-] and discharge were greatest at high flow and may contribute significantly to existing groundwater NO3- pollution. Annual NO3- discharge ranged from 0.04 to 10.0 kg of N ha-1 over 4 years. Canopy throughfall and precipitation inputs of 23.3 and 8.2 kg of N ha-1 year-1 were high relative to other undisturbed ecosystems nationwide. Dry deposition was apparently a major source of the throughfall nitrogen. NO3- concentrations from nearby, relatively unpolluted watersheds were lower by 1–3 orders of magnitude. NO3- yield was elevated on watersheds where chaparral was converted to grassland in 1960 and may be greatly accelerated after wildfire because of high postfire NH4+ concentrations and rapid nitrification in terrestrial and aquatic ecosystems.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationRiggan, Philip J.; Lockwood, Robert N.; Lopez, Ernest N. 1985. Deposition and Processing of Airborne Nitrogen Pollutants in Mediterranean-Type Ecosystems of Southern California. Envlron. Sci. Technol. 19(9): 781-789
- Nitrogen and sulfur desposition and forest nutrient status in the valley of Mexico
- Temporal and spatial trends in streamwater nitrate concentrations in the San Bernardino mountains, southern California
- Nitrogen deposition in California forests: a review
XML: View XML