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Torbern Tagesson

Forskare

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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

Författare

  • Laurent Bigaignon
  • Claire Delon
  • Ousmane Ndiaye
  • Corinne Galy-Lacaux
  • Dominique Serça
  • Frédéric Guérin
  • Tiphaine Tallec
  • Lutz Merbold
  • Torbern Tagesson
  • Rasmus Fensholt
  • Sylvain André
  • Sylvain Galliau
Visa allt

Summary, in English

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.

Avdelning/ar

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

Publiceringsår

2020

Språk

Engelska

Publikation/Tidskrift/Serie

Sustainability (Switzerland)

Volym

12

Issue

21

Dokumenttyp

Artikel i tidskrift

Förlag

MDPI AG

Ämne

  • Physical Geography

Nyckelord

  • Chambers
  • GHG
  • Modelling
  • Nitrogen
  • Tropical ecosystems

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 2071-1050