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Title: Episodic nitrous oxide soil emissions in Brazilian savanna (cerrado) fire-scars. Final technical report

Abstract

The seasonally burned cerrados of Brazil are the largest savanna-type ecosystem of South America and their contribution to the global atmospheric nitrous oxide (N2O) budget is unknown. Four types of fire-scarred cerrado along a vegetation gradient from grassland to forest were investigated during the wet season of 1992/93. The effect of fire and subsequent water additions on epiodic emissions of N2O and the associated profile dynamic of soil/gas phase N2O concentrations were studied for several months. Additionally, the effect on episodic emissions of N2O of nitrate and glucose additions to a cerrado soil after fire and the associated profile dynamic of soil/gas phase N2O mixing ratios were determined. Finally, N2O episodic emissions in cerrado converted to corn, soybean, and pasture fields were investigated during one growing/wet season. Results showed N2O consumption/emission for the four fire-scared savanna ecosystems, for nitrogen and carbon fertilization, and for agriculture/pasture ranging from -0.3 to +0.7, 1.8 to 9.1, and 0.5 to 3.7 g N2O-N ha(exp -1) d(exp -1), respectively. During the wet season the cerrado biome does not appear to be a major source of N2O to the troposphere, even following fire events. However, the results of this study suggest that conversion of the cerradomore » to high input agriculture, with liming and fertilization, can increase N2O emissions more than ten fold.« less

Authors:
; ;
Publication Date:
Research Org.:
National Aeronautics and Space Administration, Washington, DC (United States)
OSTI Identifier:
6971178
Alternate Identifier(s):
OSTI ID: 6971178
Report Number(s):
N-95-11580; NASA-TM--109897; NAS--1.15:109897
CNN: NAGW-1826
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; NITROUS OXIDE; EMISSION; SOILS; BIOGEOCHEMISTRY; BRAZIL; FIRES; PROGRESS REPORT; RANGELANDS; CHALCOGENIDES; CHEMISTRY; DEVELOPING COUNTRIES; DOCUMENT TYPES; ECOSYSTEMS; GEOCHEMISTRY; LATIN AMERICA; NITROGEN COMPOUNDS; NITROGEN OXIDES; OXIDES; OXYGEN COMPOUNDS; SOUTH AMERICA; TERRESTRIAL ECOSYSTEMS 540120* -- Environment, Atmospheric-- Chemicals Monitoring & Transport-- (1990-); 540220 -- Environment, Terrestrial-- Chemicals Monitoring & Transport-- (1990-)

Citation Formats

Nobre, A.D., Crill, P.M., and Harriss, R.C. Episodic nitrous oxide soil emissions in Brazilian savanna (cerrado) fire-scars. Final technical report. United States: N. p., 1994. Web.
Nobre, A.D., Crill, P.M., & Harriss, R.C. Episodic nitrous oxide soil emissions in Brazilian savanna (cerrado) fire-scars. Final technical report. United States.
Nobre, A.D., Crill, P.M., and Harriss, R.C. Mon . "Episodic nitrous oxide soil emissions in Brazilian savanna (cerrado) fire-scars. Final technical report". United States. doi:.
@article{osti_6971178,
title = {Episodic nitrous oxide soil emissions in Brazilian savanna (cerrado) fire-scars. Final technical report},
author = {Nobre, A.D. and Crill, P.M. and Harriss, R.C.},
abstractNote = {The seasonally burned cerrados of Brazil are the largest savanna-type ecosystem of South America and their contribution to the global atmospheric nitrous oxide (N2O) budget is unknown. Four types of fire-scarred cerrado along a vegetation gradient from grassland to forest were investigated during the wet season of 1992/93. The effect of fire and subsequent water additions on epiodic emissions of N2O and the associated profile dynamic of soil/gas phase N2O concentrations were studied for several months. Additionally, the effect on episodic emissions of N2O of nitrate and glucose additions to a cerrado soil after fire and the associated profile dynamic of soil/gas phase N2O mixing ratios were determined. Finally, N2O episodic emissions in cerrado converted to corn, soybean, and pasture fields were investigated during one growing/wet season. Results showed N2O consumption/emission for the four fire-scared savanna ecosystems, for nitrogen and carbon fertilization, and for agriculture/pasture ranging from -0.3 to +0.7, 1.8 to 9.1, and 0.5 to 3.7 g N2O-N ha(exp -1) d(exp -1), respectively. During the wet season the cerrado biome does not appear to be a major source of N2O to the troposphere, even following fire events. However, the results of this study suggest that conversion of the cerrado to high input agriculture, with liming and fertilization, can increase N2O emissions more than ten fold.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 1994},
month = {Mon Aug 01 00:00:00 EDT 1994}
}

Technical Report:
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