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  • Rahimi, JaberKarlsruhe Institute of Technology (author)

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

  • Article/chapterEnglish2021

Publisher, publication year, extent ...

  • 2021-06-24
  • Copernicus GmbH,2021
  • 24 s.

Numbers

  • LIBRIS-ID:oai:lup.lub.lu.se:505e395e-1c07-4e7e-b90e-816f9ac306b6
  • https://lup.lub.lu.se/record/505e395e-1c07-4e7e-b90e-816f9ac306b6URI
  • https://doi.org/10.5194/gmd-14-3789-2021DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • 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.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Ago, Expedit EvaristeUniversity of Liège,University of Abomey Calavi (UAC) (author)
  • Ayantunde, Augustine (author)
  • Berger, SinaUniversity of Augsburg,Karlsruhe Institute of Technology (author)
  • Bogaert, JanUniversity of Liège (author)
  • Butterbach-Bahl, KlausInternational Livestock Research Institute Nairobi,Karlsruhe Institute of Technology (author)
  • Cappelaere, BernardUniversity of Montpellier (author)
  • Cohard, Jean MartialUniversity Grenoble Alpes (author)
  • Demarty, JérômeUniversity of Montpellier (author)
  • Diouf, Abdoul Aziz (author)
  • Falk, UlrikeGerman Meteorological Service (DWD) (author)
  • Haas, EdwinKarlsruhe Institute of Technology (author)
  • Hiernaux, PierreCentre d'Ecologie Fonctionnelle et Evolutive (CEFE) (author)
  • Kraus, DavidKarlsruhe Institute of Technology (author)
  • Roupsard, OlivierUniversity of Montpellier,Agricultural research for develompent (CIRAD) (author)
  • Scheer, ClemensKarlsruhe Institute of Technology (author)
  • Srivastava, Amit KumarUniversity of Bonn (author)
  • Tagesson, TorbernLund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science,University of Copenhagen(Swepub:lu)to5874ta (author)
  • Grote, RüdigerKarlsruhe Institute of Technology (author)
  • Karlsruhe Institute of TechnologyUniversity of Liège (creator_code:org_t)

Related titles

  • In:Geoscientific Model Development: Copernicus GmbH14:6, s. 3789-38121991-959X1991-9603

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