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Sources of variation in nitrous oxide flux from Amazonian ecosystemsNitrous oxide flux and soil nutrient characteristics were measured in three undisturbed tropical ecosystem types, in cleared and burned areas, and in areas of forest converted to pasture near Manaus, Brazil. Nitrogen mineralization, nitrification, and soil nitrogen pools were high in upland forests on clay soils (terra firme) and low in the sand-type and floodplain (varzea) soils. Nitrous oxide flux followed the same pattern, with an average flux of 1.9 ng/sq cm per hr in terra firme, 0.3 in sand types, and 0.1 in varzea. Flux from recently cleared and burned areas did not differ from terra firme forest, but pastures had significantly elevated fluxes (10.3 ng/sq cm per hr). These data were combined with satellite data-based areal estimates of land cover classes to estimate total N2O-N flux from the intensive study area used by the Amazon Boundary Layer Experiment. Total N2O-N flux from the area was 22.9 kg/h; pastures covered 11 percent of the area but accounted for over 40 percent of the flux.
Document ID
19900065052
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Matson, P. A.
(NASA Ames Research Center Moffett Field, CA, United States)
Vitousek, P. M.
(Stanford University CA, United States)
Livingston, G. P.
(NASA Ames Research Center Moffett Field, CA, United States)
Swanberg, N. A.
(NASA Ames Research Center; TGS Technology, Inc. Moffett Field, CA, 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
90A52107
Distribution Limits
Public
Copyright
Other

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