Understanding N2O emissions in african ecosystems : Assessments from a semi-arid savanna grassland in senegal and sub-tropical agricultural fields in Kenya
(2020) In Sustainability (Switzerland) 12(21).- Abstract
This study is based on the analysis of field-measured nitrous oxide (N2 O) emissions from a Sahelian semi-arid grassland site in Senegal (Dahra), tropical humid agricultural plots in Kenya (Mbita region) and simulations using a 1D model designed for semi arid ecosystems in Dahra. This study aims at improving present knowledge and inventories of N2 O emissions from the African continent. N2 O emissions were larger at the agricultural sites in the Mbita region (range: 0.0 ± 0.0 to 42.1 ± 10.7 ngN m−2 s−1) than at the Dahra site (range: 0.3 ± 0 to 7.4 ± 6.5 ngN m−2 s−1). Soil water and nitrate (NO3−) contents appeared to be the most important... (More)
This study is based on the analysis of field-measured nitrous oxide (N2 O) emissions from a Sahelian semi-arid grassland site in Senegal (Dahra), tropical humid agricultural plots in Kenya (Mbita region) and simulations using a 1D model designed for semi arid ecosystems in Dahra. This study aims at improving present knowledge and inventories of N2 O emissions from the African continent. N2 O emissions were larger at the agricultural sites in the Mbita region (range: 0.0 ± 0.0 to 42.1 ± 10.7 ngN m−2 s−1) than at the Dahra site (range: 0.3 ± 0 to 7.4 ± 6.5 ngN m−2 s−1). Soil water and nitrate (NO3−) contents appeared to be the most important drivers of N2 O emissions in Dahra at the seasonal scale in both regions. The seasonal pattern of modelled N2 O emissions is well represented, though the model performed better during the rainy season than between the rainy and dry seasons. This study highlighted that the water-filled pore space threshold recognised as a trigger for N2 O emissions should be reconsidered for semi-arid ecosystems. Based on both measurements and simulated results, an annual N2 O budget was estimated for African savanna/grassland and agricultural land ranging between 0.17–0.26 and 1.15–1.20 TgN per year, respectively.
(Less)
- author
- organization
- publishing date
- 2020
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Chambers, GHG, Modelling, Nitrogen, Tropical ecosystems
- in
- Sustainability (Switzerland)
- volume
- 12
- issue
- 21
- article number
- 8875
- pages
- 26 pages
- publisher
- MDPI AG
- external identifiers
-
- scopus:85094578084
- ISSN
- 2071-1050
- DOI
- 10.3390/su12218875
- language
- English
- LU publication?
- yes
- id
- 3f3d5212-bc14-4105-920e-39bf62149dd9
- date added to LUP
- 2020-11-16 08:42:21
- date last changed
- 2022-04-19 02:03:36
@article{3f3d5212-bc14-4105-920e-39bf62149dd9, abstract = {{<p>This study is based on the analysis of field-measured nitrous oxide (N<sub>2</sub> O) emissions from a Sahelian semi-arid grassland site in Senegal (Dahra), tropical humid agricultural plots in Kenya (Mbita region) and simulations using a 1D model designed for semi arid ecosystems in Dahra. This study aims at improving present knowledge and inventories of N<sub>2</sub> O emissions from the African continent. N<sub>2</sub> O emissions were larger at the agricultural sites in the Mbita region (range: 0.0 ± 0.0 to 42.1 ± 10.7 ngN m<sup>−2</sup> s<sup>−1</sup>) than at the Dahra site (range: 0.3 ± 0 to 7.4 ± 6.5 ngN m<sup>−2</sup> s<sup>−1</sup>). Soil water and nitrate (NO<sub>3</sub><sup>−</sup>) contents appeared to be the most important drivers of N<sub>2</sub> O emissions in Dahra at the seasonal scale in both regions. The seasonal pattern of modelled N<sub>2</sub> O emissions is well represented, though the model performed better during the rainy season than between the rainy and dry seasons. This study highlighted that the water-filled pore space threshold recognised as a trigger for N<sub>2</sub> O emissions should be reconsidered for semi-arid ecosystems. Based on both measurements and simulated results, an annual N<sub>2</sub> O budget was estimated for African savanna/grassland and agricultural land ranging between 0.17–0.26 and 1.15–1.20 TgN per year, respectively.</p>}}, author = {{Bigaignon, Laurent and Delon, Claire and Ndiaye, Ousmane and Galy-Lacaux, Corinne and Serça, Dominique and Guérin, Frédéric and Tallec, Tiphaine and Merbold, Lutz and Tagesson, Torbern and Fensholt, Rasmus and André, Sylvain and Galliau, Sylvain}}, issn = {{2071-1050}}, keywords = {{Chambers; GHG; Modelling; Nitrogen; Tropical ecosystems}}, language = {{eng}}, number = {{21}}, publisher = {{MDPI AG}}, series = {{Sustainability (Switzerland)}}, title = {{Understanding N<sub>2</sub>O emissions in african ecosystems : Assessments from a semi-arid savanna grassland in senegal and sub-tropical agricultural fields in Kenya}}, url = {{http://dx.doi.org/10.3390/su12218875}}, doi = {{10.3390/su12218875}}, volume = {{12}}, year = {{2020}}, }