No-tillage lessens soil CO<sub>2</sub> emissions the most under arid and sandy soil conditions: results from a meta-analysis
The management of agroecosystems plays a crucial role in the global carbon cycle with soil tillage leading to known organic carbon redistributions within soils and changes in soil CO<sub>2</sub> emissions. Yet, discrepancies exist on the impact of tillage on soil CO<sub>2</sub&g...
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doaj-deb6c4f3beed426b8bcc6357549d842e2020-11-24T23:22:35ZengCopernicus PublicationsBiogeosciences1726-41701726-41892016-06-0113123619363310.5194/bg-13-3619-2016No-tillage lessens soil CO<sub>2</sub> emissions the most under arid and sandy soil conditions: results from a meta-analysisK. Abdalla0P. Chivenge1P. Ciais2V. Chaplot3School of Agricultural, Earth & Environmental Sciences, CWRR, Rabie Saunders Building, University of KwaZulu-Natal, Scottsville, 3209, South AfricaSchool of Agricultural, Earth & Environmental Sciences, CWRR, Rabie Saunders Building, University of KwaZulu-Natal, Scottsville, 3209, South AfricaIPSL – LSCE, CEA CNRS UVSQ, Centre d'Etudes Orme des Merisiers, 91191, Gif-sur-Yvette, FranceSchool of Agricultural, Earth & Environmental Sciences, CWRR, Rabie Saunders Building, University of KwaZulu-Natal, Scottsville, 3209, South AfricaThe management of agroecosystems plays a crucial role in the global carbon cycle with soil tillage leading to known organic carbon redistributions within soils and changes in soil CO<sub>2</sub> emissions. Yet, discrepancies exist on the impact of tillage on soil CO<sub>2</sub> emissions and on the main soil and environmental controls. A meta-analysis was conducted using 46 peer-reviewed publications totaling 174 paired observations comparing CO<sub>2</sub> emissions over entire seasons or years from tilled and untilled soils across different climates, crop types and soil conditions with the objective of quantifying tillage impact on CO<sub>2</sub> emissions and assessing the main controls. On average, tilled soils emitted 21 % more CO<sub>2</sub> than untilled soils, which corresponded to a significant difference at <i>P</i><i><</i>0.05. The difference increased to 29 % in sandy soils from arid climates with low soil organic carbon content (SOC<sub>C</sub> < 1 %) and low soil moisture, but tillage had no impact on CO<sub>2</sub> fluxes in clayey soils with high background SOC<sub>C</sub> (> 3 %). Finally, nitrogen fertilization and crop residue management had little effect on the CO<sub>2</sub> responses of soils to no-tillage. These results suggest no-tillage is an effective mitigation measure of carbon dioxide losses from dry land soils. They emphasize the importance of including information on soil factors such as texture, aggregate stability and organic carbon content in global models of the carbon cycle.http://www.biogeosciences.net/13/3619/2016/bg-13-3619-2016.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
K. Abdalla P. Chivenge P. Ciais V. Chaplot |
spellingShingle |
K. Abdalla P. Chivenge P. Ciais V. Chaplot No-tillage lessens soil CO<sub>2</sub> emissions the most under arid and sandy soil conditions: results from a meta-analysis Biogeosciences |
author_facet |
K. Abdalla P. Chivenge P. Ciais V. Chaplot |
author_sort |
K. Abdalla |
title |
No-tillage lessens soil CO<sub>2</sub> emissions the most under arid and sandy soil conditions: results from a meta-analysis |
title_short |
No-tillage lessens soil CO<sub>2</sub> emissions the most under arid and sandy soil conditions: results from a meta-analysis |
title_full |
No-tillage lessens soil CO<sub>2</sub> emissions the most under arid and sandy soil conditions: results from a meta-analysis |
title_fullStr |
No-tillage lessens soil CO<sub>2</sub> emissions the most under arid and sandy soil conditions: results from a meta-analysis |
title_full_unstemmed |
No-tillage lessens soil CO<sub>2</sub> emissions the most under arid and sandy soil conditions: results from a meta-analysis |
title_sort |
no-tillage lessens soil co<sub>2</sub> emissions the most under arid and sandy soil conditions: results from a meta-analysis |
publisher |
Copernicus Publications |
series |
Biogeosciences |
issn |
1726-4170 1726-4189 |
publishDate |
2016-06-01 |
description |
The management of agroecosystems plays a crucial role in the global carbon
cycle with soil tillage leading to known organic carbon redistributions
within soils and changes in soil CO<sub>2</sub> emissions. Yet, discrepancies exist
on the impact of tillage on soil CO<sub>2</sub> emissions and on the main soil and
environmental controls. A meta-analysis was conducted using 46 peer-reviewed
publications totaling 174 paired observations comparing CO<sub>2</sub> emissions
over entire seasons or years from tilled and untilled soils across different
climates, crop types and soil conditions with the objective of quantifying
tillage impact on CO<sub>2</sub> emissions and assessing the main controls. On
average, tilled soils emitted 21 % more CO<sub>2</sub> than untilled soils,
which corresponded to a significant difference at <i>P</i><i><</i>0.05. The
difference increased to 29 % in sandy soils from arid climates with low
soil organic carbon content (SOC<sub>C</sub> < 1 %) and low soil
moisture, but tillage had no impact on CO<sub>2</sub> fluxes in clayey soils with
high background SOC<sub>C</sub> (> 3 %). Finally, nitrogen
fertilization and crop residue management had little effect on the CO<sub>2</sub>
responses of soils to no-tillage. These results suggest no-tillage is an
effective mitigation measure of carbon dioxide losses from dry land soils.
They emphasize the importance of including information on soil factors such
as texture, aggregate stability and organic carbon content in global models
of the carbon cycle. |
url |
http://www.biogeosciences.net/13/3619/2016/bg-13-3619-2016.pdf |
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