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The effects of fire on biogenic soil emissions of nitric oxide and nitrous oxideMeasurements of biogenic soil emissions of nitric oxide (NO) and nitrous oxide (N2O) before and after a controlled burn conducted in a chaparral ecosystem on June 22, 1987, showed significantly enhanced emissions of both gases after the burn. Mean NO emissions from heavily burned and wetted (to simulate rainfall) sites exceeded 40 ng N/sq m s, and increase of 2 to 3 compared to preburn wetted site measurements. N2O emissions from burned and wetted sites ranged from 9 to 22 ng N/sq m s. Preburn N2O emissions from these wetted sites were all below the detection level of the instrumentation, indicating a flux below 2 ng N/sq m s. The flux of NO exceeded the N2O flux from burned wetted sites by factors ranging from 2.7 to 3.4. These measurements, coupled with preburn and postburn measurements of ammonium and nitrate in the soil of this chaparral ecosystem and measurements of NO and N2O emissions obtained under controlled laboratory conditions, suggest that the postfire enhancement of NO and N2O emissions is due to production of these gases by nitrifying bacteria.
Document ID
19890041942
Document Type
Reprint (Version printed in journal)
Authors
Levine, Joel S. (NASA Langley Research Center Hampton, VA, United States)
Cofer, Wesley R., III (NASA Langley Research Center Hampton, VA, United States)
Sebacher, Daniel I. (NASA Langley Research Center Hampton, VA, United States)
Boston, Penelope J. (NASA Langley Research Center Hampton, VA, United States)
Winstead, Edward L. (NASA Langley Research Center Hampton, VA, United States)
Sebacher, Shirley (ST Systems Corp. Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
December 1, 1988
Publication Information
Publication: Global Biogeochemical Cycles
Volume: 2
ISSN: 0886-6236
Subject Category
GEOSCIENCES (GENERAL)
Distribution Limits
Public
Copyright
Other