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Torbern Tagesson

Forskare

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Modeling gas exchange and biomass production in West African Sahelian and Sudanian ecological zones

Författare

  • Jaber Rahimi
  • Expedit Evariste Ago
  • Augustine Ayantunde
  • Sina Berger
  • Jan Bogaert
  • Klaus Butterbach-Bahl
  • Bernard Cappelaere
  • Jean Martial Cohard
  • Jérôme Demarty
  • Abdoul Aziz Diouf
  • Ulrike Falk
  • Edwin Haas
  • Pierre Hiernaux
  • David Kraus
  • Olivier Roupsard
  • Clemens Scheer
  • Amit Kumar Srivastava
  • Torbern Tagesson
  • Rüdiger Grote
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Summary, in English

West African Sahelian and Sudanian ecosystems provide essential services to people and also play a significant role within the global carbon cycle. However, climate and land use are dynamically changing, and uncertainty remains with respect to how these changes will affect the potential of these regions to provide food and fodder resources or how they will affect the biosphere-atmosphere exchange of CO2. In this study, we investigate the capacity of a process-based biogeochemical model, LandscapeDNDC, to simulate net ecosystem exchange (NEE) and aboveground biomass of typical managed and natural Sahelian and Sudanian savanna ecosystems. In order to improve the simulation of phenology, we introduced soil-water availability as a common driver of foliage development and productivity for all of these systems. The new approach was tested by using a sample of sites (calibration sites) that provided NEE from flux tower observations as well as leaf area index data from satellite images (MODIS, MODerate resolution Imaging Spectroradiometer). For assessing the simulation accuracy, we applied the calibrated model to 42 additional sites (validation sites) across West Africa for which measured aboveground biomass data were available. The model showed good performance regarding biomass of crops, grass, or trees, yielding correlation coefficients of 0.82, 0.94, and 0.77 and root-mean-square errors of 0.15, 0.22, and 0.12gkggm-2, respectively. The simulations indicate aboveground carbon stocks of up to 0.17, 0.33, and 0.54gkggCgha-1gm-2 for agricultural, savanna grasslands, and savanna mixed tree-grassland sites, respectively. Carbon stocks and exchange rates were particularly correlated with the abundance of trees, and grass biomass and crop yields were higher under more humid climatic conditions. Our study shows the capability of LandscapeDNDC to accurately simulate carbon balances in natural and agricultural ecosystems in semiarid West Africa under a wide range of conditions; thus, the model could be used to assess the impact of land-use and climate change on the regional biomass productivity.

Avdelning/ar

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

Publiceringsår

2021

Språk

Engelska

Sidor

3789-3812

Publikation/Tidskrift/Serie

Geoscientific Model Development

Volym

14

Issue

6

Dokumenttyp

Artikel i tidskrift

Förlag

Copernicus GmbH

Ämne

  • Earth and Related Environmental Sciences

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1991-959X