Understanding N2O emissions in african ecosystems: Assessments from a semi-arid savanna grassland in senegal and sub-tropical agricultural fields in Kenya
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Understanding N2O emissions in african ecosystems : Assessments from a semi-arid savanna grassland in senegal and sub-tropical agricultural fields in Kenya. / Bigaignon, Laurent; Delon, Claire; Ndiaye, Ousmane; Galy-Lacaux, Corinne; Serça, Dominique; Guérin, Frédéric; Tallec, Tiphaine; Merbold, Lutz; Tagesson, Torbern; Fensholt, Rasmus; André, Sylvain; Galliau, Sylvain.
In: Sustainability (Switzerland), Vol. 12, No. 21, 8875, 01.11.2020, p. 1-26.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Understanding N2O emissions in african ecosystems
T2 - Assessments from a semi-arid savanna grassland in senegal and sub-tropical agricultural fields in Kenya
AU - Bigaignon, Laurent
AU - Delon, Claire
AU - Ndiaye, Ousmane
AU - Galy-Lacaux, Corinne
AU - Serça, Dominique
AU - Guérin, Frédéric
AU - Tallec, Tiphaine
AU - Merbold, Lutz
AU - Tagesson, Torbern
AU - Fensholt, Rasmus
AU - André, Sylvain
AU - Galliau, Sylvain
PY - 2020/11/1
Y1 - 2020/11/1
N2 - 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.
AB - 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.
KW - Chambers
KW - GHG
KW - Modelling
KW - Nitrogen
KW - Tropical ecosystems
U2 - 10.3390/su12218875
DO - 10.3390/su12218875
M3 - Journal article
AN - SCOPUS:85094578084
VL - 12
SP - 1
EP - 26
JO - Sustainability
JF - Sustainability
SN - 2071-1050
IS - 21
M1 - 8875
ER -
ID: 251635782