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Long-term annual burning of grassland increases CO2 emissions from soils

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Title Long-term annual burning of grassland increases CO2 emissions from soils
 
Creator Abdalla, Khatab
 
Contributor Chivenge, Pauline
Everson, Colin
Mathieu, Olivier
Thevenot, Mathieu
Chaplot, Vincent
 
Subject grassland managemen
burning soil
carbon soil
 
Description Grasslands have potential to mitigate against climate change because of their large capacity to store soil organic
carbon (SOC). However, the long-term impact of grassland management such as burning, which is still common
in many areas of theworld, on SOC is still a matter of debate. The objective of this studywas to quantify the longterm
effects of annual burning on CO2 output from soils and SOC stocks. The study was performed on a 62 years
old field trial comparing annual burning (AB) to no burning associated with tree encroachment (NB), and to annual
mowing (AM) with all treatments laid out in randomized block design with three replicates per treatment.
CO2 emissions from soil were continuously measured over two years and were correlated to soil chemical and
physical properties. AB and AM produced 30 and 34% greater CO2 emissions from soil than NB (1.80 ± 0.13 vs.
2.34±0.18 and 2.41±0.17 g C-CO2m−2 d−1 for NB, AB and AMrespectively). AB and AMalso produced greater
CO2 emissions fromsoil and per gramof soil carbon (1.32±0.1 and 1.35±0.1 mgC-CO2 gC−1 d−1, respectively)
than NB(1.05±0.07mgC-CO2gC−1 d−1),which corresponded to significant differences of respectively 26% and
29%. Overall, CO2 emissions fromsoil (perm2) significantly increased with soil water content (r=0.72) followed
by SOC stocks (r= 0.59), SOC content (r =0.50), soil bulk density (r= 0.49), soil temperature (r=0.47), C:N
ratio (r=0.46) and meanweight diameter (r=0.38). These findings suggest that long-termannual burning increases
CO2 output from soils. Additional greenhouse gases emissions from burning itself and alternative grassland
management techniques were finally discussed.
 
Date 2016-07-15
2017-02-08T22:46:33Z
2017-02-08T22:46:33Z
 
Type Journal Article
 
Identifier https://mel.cgiar.org/dspace/limited
http://oar.icrisat.org/id/eprint/9837
Khatab Abdalla, Pauline Chivenge, Colin Everson, Olivier Mathieu, Mathieu Thevenot, Vincent Chaplot. (15/7/2016). Long-term annual burning of grassland increases CO2 emissions from soils. Geoderma, 282, pp. 80-86.
https://hdl.handle.net/20.500.11766/5581
Limited access
 
Language en
 
Rights CC-BY-NC-4.0
 
Format PDF
 
Publisher Elsevier
 
Source Geoderma;282,(2016) Pagination 80,86