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High N2O emissions in dry ecosystems
Year:
2013
Source of publication :
European Journal of Soil Biology
Authors :
Zaady, Eli
;
.
Volume :
59
Co-Authors:
Zaady, E., Agricultural Research Organization, Gilat Research Center, Mobile Post Negev 85280, Israel
Groffman, P.M., Cary Institute of Ecosystem Studies, Box AB, 2801 Sharon Turnpike, Millbrook, NY 12545-0129, United States
Standing, D., Agricultural Research Organization, Gilat Research Center, Mobile Post Negev 85280, Israel
Shachak, M., Ben-Gurion University of the Negev, Jacob Blaustein Institutes for Desert Research, Mitrani Department of Desert Ecology, Sde-Boker Campus, Israel
Facilitators :
From page:
1
To page:
7
(
Total pages:
7
)
Abstract:
Denitrification is an anaerobic respiration that reduces nitrogen (N) oxides (NO3 -, NO2 -) to N gases (N2O, N2). Our hypothesis suggests that this process might be an important process in depleting nitrogen in dryland soils, based on the idea that the intensity of microbial respiration following infrequent rainfall events and floods, is high enough to deplete soil O2 concentrations and allow denitrification to occur. We tested our hypothesis by analyses of soil surface samples, collected along a rainfall gradient. This enabled us to evaluate the relationship between rainfall amount and denitrification potential. Soils were collected from beneath dominant shrubs and from the biological soil crusts (BSC) in the spaces between them. In incubated soils respiration decreased rapidly after 12h while denitrification peaked at 24h. Both respiration and denitrification were higher in soils beneath shrubs than in the BSC. However, BSC account for up to 88% of the land cover at the drier end and 60% in the wetter end of the gradient and may therefore contribute the majority of soil gaseous emissions. Denitrification:respiration increased, in soil samples collected, as rainfall gradient decreased, suggesting that denitrification is an increasingly important component of microbial respiration as aridity increases. © 2013 Elsevier Masson SAS.
Note:
Related Files :
Arid
Biological soil crusts
DENITRIFICATION
Desert shrub
ecosystems
Patchiness
Rainfall gradient
respiration
soil
Soil crusts
Show More
Related Content
More details
DOI :
10.1016/j.ejsobi.2013.08.004
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
28330
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:38
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Scientific Publication
High N2O emissions in dry ecosystems
59
Zaady, E., Agricultural Research Organization, Gilat Research Center, Mobile Post Negev 85280, Israel
Groffman, P.M., Cary Institute of Ecosystem Studies, Box AB, 2801 Sharon Turnpike, Millbrook, NY 12545-0129, United States
Standing, D., Agricultural Research Organization, Gilat Research Center, Mobile Post Negev 85280, Israel
Shachak, M., Ben-Gurion University of the Negev, Jacob Blaustein Institutes for Desert Research, Mitrani Department of Desert Ecology, Sde-Boker Campus, Israel
High N2O emissions in dry ecosystems
Denitrification is an anaerobic respiration that reduces nitrogen (N) oxides (NO3 -, NO2 -) to N gases (N2O, N2). Our hypothesis suggests that this process might be an important process in depleting nitrogen in dryland soils, based on the idea that the intensity of microbial respiration following infrequent rainfall events and floods, is high enough to deplete soil O2 concentrations and allow denitrification to occur. We tested our hypothesis by analyses of soil surface samples, collected along a rainfall gradient. This enabled us to evaluate the relationship between rainfall amount and denitrification potential. Soils were collected from beneath dominant shrubs and from the biological soil crusts (BSC) in the spaces between them. In incubated soils respiration decreased rapidly after 12h while denitrification peaked at 24h. Both respiration and denitrification were higher in soils beneath shrubs than in the BSC. However, BSC account for up to 88% of the land cover at the drier end and 60% in the wetter end of the gradient and may therefore contribute the majority of soil gaseous emissions. Denitrification:respiration increased, in soil samples collected, as rainfall gradient decreased, suggesting that denitrification is an increasingly important component of microbial respiration as aridity increases. © 2013 Elsevier Masson SAS.
Scientific Publication
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