Journal of Arid Land

, Volume 9, Issue 2, pp 210–221 | Cite as

Livestock induces strong spatial heterogeneity of soil CO2, N2O and CH4 emissions within a semi-arid sylvo-pastoral landscape in West Africa

  • Mohamed H. Assouma
  • Dominique Serça
  • Frédéric Guérin
  • Vincent Blanfort
  • Philippe Lecomte
  • Ibra Touré
  • Alexandre Ickowicz
  • Raphaël J. Manlay
  • Martial Bernoux
  • Jonathan Vayssières
Article

Abstract

Greenhouse gas (GHG) emissions from the surface soils and surface water receiving animal excreta may be important components of the GHG balance of terrestrial ecosystems, but the associated processes are poorly documented in tropical environments, especially in tropical arid and semi-arid areas. A typical sylvo-pastoral landscape in the semi-arid zone of Senegal, West Africa, was investigated in this study. The study area (706 km² of managed pastoral land) was a circular zone with a radius of 15 km centered on a borehole used to water livestock. The landscape supports a stocking rate ranging from 0.11 to 0.39 tropical livestock units per hectare depending on the seasonal movements of the livestock. Six landscape units were investigated (land in the vicinity of the borehole, natural ponds, natural rangelands, forest plantations, settlements, and enclosed plots). Carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4) fluxes were measured with static chambers set up at 13 sites covering the six landscape units, and the 13 sites are assumed to be representative of the spatial heterogeneity of the emissions. A total of 216 fluxes were measured during the one-year study period (May 2014 to April 2015). At the landscape level, soils and surface water emitted an average 19.8 t C-CO2 eq/(hm²•a) (CO2: 82%, N2O: 15%, and CH4: 3%), but detailed results revealed notable spatial heterogeneity of GHG emissions. CO2 fluxes ranged from 1148.2 (±91.6) mg/(m²•d) in rangelands to 97,980.2 (±14,861.7) mg/(m²•d) in surface water in the vicinity of the borehole. N2O fluxes ranged from 0.6 (±0.1) mg/(m²•d) in forest plantations to 22.6 (±10.8) mg/(m²•d) in the vicinity of the borehole. CH4 fluxes ranged from–3.2 (±0.3) mg/(m²•d) in forest plantations to 8788.5 (±2295.9) mg/(m²•d) from surface water in the vicinity of the borehole. This study identified GHG emission “hot spots” in the landscape. Emissions from the surface soils were significantly higher in the landscape units most frequently used by the animals, i.e., in the vicinity of the borehole and settlements; and emissions measured from surface water in the vicinity of the borehole and from natural ponds were on average about 10 times higher than soil emissions.

Keywords

greenhouse gases soil surface water livestock landscape Senegal 

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Notes

Acknowledgments

The study was funded by the Islamic Development Bank (the Merit Scholarship Program for High Technology) and the European Union (the FP7-KBBE-2010 Animal Change Project).

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Copyright information

© Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Springer - Verlag GmbH 2017

Authors and Affiliations

  • Mohamed H. Assouma
    • 1
    • 2
  • Dominique Serça
    • 3
  • Frédéric Guérin
    • 4
  • Vincent Blanfort
    • 1
  • Philippe Lecomte
    • 1
    • 2
  • Ibra Touré
    • 1
    • 2
    • 5
  • Alexandre Ickowicz
    • 1
  • Raphaël J. Manlay
    • 6
  • Martial Bernoux
    • 7
  • Jonathan Vayssières
    • 1
    • 2
  1. 1.CIRAD-UMR SelmetCampus International BaillarguetMontpellierFrance
  2. 2.DP PPZS, ISRA-LNERVDakar HannSenegal
  3. 3.Laboratoire d’Aérologie-OMPUniversité Paul SabatierToulouseFrance
  4. 4.Geosciences Environnement Toulouse UMR 5563 & UR 234 IRDUniversité Paul SabatierToulouseFrance
  5. 5.CILSSOuagadougouBurkina Faso
  6. 6.AgroParisTech-UMR Eco&SolsMontpellierFrance
  7. 7.IRD-UMR Eco&SolsMontpellierFrance

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