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Emission of nitric oxide (NO) from tropical forest soils and exchange of NO between the forest canopy and atmospheric boundary layersEmissions of NO from soils in the Amazon rain forest were measured at 66 locations using an enclosure technique, and continuous vertical profiles of NO and O3 were measured between the ground and 41-m altitude. Fluxes of NO averaged 8.9 (+ or - 1.5) x 10 to the 9th molecules/sq cm per sec from the dominant (yellow clay) soils of the region, with larger fluxes observed from adjacent white sand soils. Fluxes from clay soils were lower by more than a factor of 5 than fluxes observed during the dry season at a nearby site. Low soil emission rates were reflected in lower concentrations of NO at the top of the forest canopy in the wet season, only 30-50 parts per trillion by volume during the daytime. The measured fluxes are consistent with chemical mass balances for NO within the forest canopy, calculated from the NO and O3 profiles taken at night, and with observations of NO between 150 and 5000 m altitude. Measurements of NO emission rates from soil plots fertilized using NaNO3, NH4Cl, or sucrose indicated that a reductive pathway (denitrification) may have been primarily responsible for production of the NO released by both clay and sand soils.
Document ID
19900065049
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bakwin, Peter S.
(Harvard Univ. Cambridge, MA, United States)
Wofsy, Steven C.
(Harvard Univ. Cambridge, MA, United States)
Fan, Song-Miao
(Harvard University Cambridge, MA, United States)
Keller, Michael
(Princeton University NJ, United States)
Trumbore, Susan E.
(Lamont-Doherty Geophysical Observatory Palisades, NJ, United States)
Date Acquired
August 14, 2013
Publication Date
September 20, 1990
Publication Information
Publication: Journal of Geophysical Research
Volume: 95
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
90A52104
Funding Number(s)
CONTRACT_GRANT: NAG1-55
CONTRACT_GRANT: NSF ATM-84-13153
Distribution Limits
Public
Copyright
Other

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