Skip to Main Content
Uptake and Distribution of Nitrogen from Acidic Fog within a Ponderosa Pine (Pinus ponderosa Laws.)/Litter/Soil SystemAuthor(s): Mark E. Fenn; Theodor D. Leininger
Source: Forest Science, Vol. 41, No. 4, November 1995. pp 645-663.
Publication Series: Miscellaneous Publication
PDF: View PDF (399 KB)
DescriptionThe magnitude and importance of wet deposition of N in forests of the South Coast (Los Angeles) Air Basin have not been well characterized. We exposed 3-yr-old ponderosa pine (Pinus ponderos Laws.) seedlings growing in native forest soil to acidic fog treatments (pH 3.1) simulating fog chemistry from a pine forest near Los Angeles, California. Fog solutions contained either 15NH+4, 15NO-3 or unlabeled N. The fog treatments were applied in open-top chambers in six 5-hr exposures. Soil treatments within each of the fog exposures were bare soil, soil overlain with L- and F-litter, and soil covered with plastic during the fog events to preventfogwaterfrom contacting soil. Seedlings were harvested and samples were collected 15 wk after the fog treatments. Uptake of 15N by roots was by farthe dominant pathway for plant assimilation of fog-deposited 15N. Deposition of N in fog supplied 9.4% and 8.7% of the total N in current-year crown biomass in the litter-overlay and bare-soil treatments, respectively. Total N concentrations in every plant fraction except current-year stems were significantly higher in the bare-soil treatment than in the plastic-covered soil treatment. Less than 5% of the 15N deposited directly to the seedling crowns was retained by the plants in the covered-soil treatment, whereas 57% of the 15N deposited to the seedling/litter/soil systems was incorporated into plant biomass. The litter layers retained 15NH+4 more effectively than 15NO-3. Data from this study suggest that N deposited from fog may be an important source of N for plant growth in forests of the SCAB where fog occurrence and pollution exposure coincide. FOR. SCI. 41(4):645-663.
- 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.
CitationFenn, Mark E.; Leininger, Theodor D. 1995. Uptake and Distribution of Nitrogen from Acidic Fog within a Ponderosa Pine (Pinus ponderosa Laws.)/Litter/Soil System. Forest Science, Vol. 41, No. 4, November 1995. pp 645-663.
KeywordsNitrogen deposition, nitrogen saturation, nutrient cycling, wet deposit, ammonium nitrate.
- Soil respiration response to three years of elevated CO2 and N fertilization in ponderosa pine (Pinus ponderosa Doug. ex Laws.)
- Recovery of ectomycorrhizal fungus communities fifteen years after fuels reduction treatments in ponderosa pine forests of the Blue Mountains, Oregon
- Management of ponderosa pine nutrition through fertilization
XML: View XML