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Torbern Tagesson

Forskare

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To what extent are greenhouse-gas emissions offset by trees in a Sahelian silvopastoral system?

Författare

  • Yélognissè Agbohessou
  • Claire Delon
  • Eric Mougin
  • Manuela Grippa
  • Torbern Tagesson
  • Moussa Diedhiou
  • Seydina Ba
  • Daouda Ngom
  • Rémi Vezy
  • Ousmane Ndiaye
  • Mohamed H. Assouma
  • Mamadou Diawara
  • Olivier Roupsard
Visa allt

Summary, in English

To assess the extent to which trees in a semi-arid silvopastoral system (SPS) can offset the greenhouse-gas (GHG) emissions of the system's livestock, this study used two process-based models (STEP-GENDEC-N2O and DynACof) to simulate 9 years of agricultural activity and resulting emissions in a SPS that has been operating in sahelian Senegal. STEP-GENDEC-N2O simulated soil N2O and CO2 fluxes, plus growth of the herbaceous layer, while DynACof focused on the tree layer. Outputs from the models included simulated time series of vegetative growth, water fluxes, and emissions. This output was validated through the use of published data, and measurements that were made at the SPS. Overall, the outputs from STEP-GENDEC-N2O agreed well with validation data for water fluxes, soil N, soil C, herbaceous biomass, and N2O emissions. Good agreement was also found between the measured fluxes of the SPS ecosystem, and the simulated values that were generated by combining STEP-GENDEC-N2O's simulations (of the herbaceous layer's heterotrophic respiration, autotrophic respiration, and gross primary productivity (GPP)) with DynACof's simulations of the tree layer's autotrophic respiration and GPP. Among the insights gained from the simulations was that in this SPS's sandy soils, nitrification was the dominant process that leads to N2O emissions. Our results show that the trees, at their current density (81 ha−1) offset 18 % to 41 % of the GHG emissions from livestock. With further development, the model set-up can be used for estimating the GHG offset at other tree densities, and will be useful for guiding future policies regarding climate-change adaptation and mitigation in the management of the Sahel's SPSs.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publiceringsår

2023-12

Språk

Engelska

Publikation/Tidskrift/Serie

Agricultural and Forest Meteorology

Volym

343

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Environmental Sciences

Nyckelord

  • Greenhouse gas emissions
  • Livestock
  • Process-based model
  • Silvopastoral systems
  • Trees

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0168-1923