Modeling gas exchange and biomass production in West African Sahelian and Sudanian ecological zones
Abstract. 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...
| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Copernicus GmbH
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/129272 |
| _version_ | 1855518198008381440 |
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| author | Rahimi, Jaber Ago, Expedit Evariste Ayantunde, Augustine Berger, Sina Bogaert, Jan Butterbach-Bahl, Klaus Cappelaere, Bernard Cohard, Jean-Martial Demarty, Jérôme Diouf, Abdoul Aziz Falk, Ulrike Haas, Edwin Hiernaux, Pierre Kraus, David Roupsard, Olivier Scheer, Clemens Srivastava, Amit Kumar Tagesson, Torbern Grote, Rüdiger |
| author_browse | Ago, Expedit Evariste Ayantunde, Augustine Berger, Sina Bogaert, Jan Butterbach-Bahl, Klaus Cappelaere, Bernard Cohard, Jean-Martial Demarty, Jérôme Diouf, Abdoul Aziz Falk, Ulrike Grote, Rüdiger Haas, Edwin Hiernaux, Pierre Kraus, David Rahimi, Jaber Roupsard, Olivier Scheer, Clemens Srivastava, Amit Kumar Tagesson, Torbern |
| author_facet | Rahimi, Jaber Ago, Expedit Evariste Ayantunde, Augustine Berger, Sina Bogaert, Jan Butterbach-Bahl, Klaus Cappelaere, Bernard Cohard, Jean-Martial Demarty, Jérôme Diouf, Abdoul Aziz Falk, Ulrike Haas, Edwin Hiernaux, Pierre Kraus, David Roupsard, Olivier Scheer, Clemens Srivastava, Amit Kumar Tagesson, Torbern Grote, Rüdiger |
| author_sort | Rahimi, Jaber |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Abstract. 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 0.12 kg m−2, respectively. The simulations indicate aboveground carbon stocks of up to 0.17, 0.33, and 0.54 kg C ha−1 m−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. |
| format | Journal Article |
| id | CGSpace129272 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Copernicus GmbH |
| publisherStr | Copernicus GmbH |
| record_format | dspace |
| spelling | CGSpace1292722025-12-08T09:54:28Z Modeling gas exchange and biomass production in West African Sahelian and Sudanian ecological zones Rahimi, Jaber Ago, Expedit Evariste Ayantunde, Augustine Berger, Sina Bogaert, Jan Butterbach-Bahl, Klaus Cappelaere, Bernard Cohard, Jean-Martial Demarty, Jérôme Diouf, Abdoul Aziz Falk, Ulrike Haas, Edwin Hiernaux, Pierre Kraus, David Roupsard, Olivier Scheer, Clemens Srivastava, Amit Kumar Tagesson, Torbern Grote, Rüdiger production biomass ecological zones gas exchange biomass production Abstract. 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 0.12 kg m−2, respectively. The simulations indicate aboveground carbon stocks of up to 0.17, 0.33, and 0.54 kg C ha−1 m−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. 2021-06-24 2023-03-10T14:32:53Z 2023-03-10T14:32:53Z Journal Article https://hdl.handle.net/10568/129272 en Open Access Copernicus GmbH Rahimi, Jaber; Ago, Expedit Evariste; Ayantunde, Augustine; Berger, Sina; Bogaert, Jan; Butterbach-Bahl, Klaus; Cappelaere, Bernard; Cohard, Jean-Martial; Demarty, Jérôme; Diouf, Abdoul Aziz; Falk, Ulrike; Haas, Edwin; Hiernaux, Pierre; Kraus, David; Roupsard, Olivier; Scheer, Clemens; Srivastava, Amit Kumar; Tagesson, Torbern; Grote, Rüdiger. 2021. Modeling gas exchange and biomass production in West African Sahelian and Sudanian ecological zones. Geoscientific Model Development 14: 3789-3812 |
| spellingShingle | production biomass ecological zones gas exchange biomass production Rahimi, Jaber Ago, Expedit Evariste Ayantunde, Augustine Berger, Sina Bogaert, Jan Butterbach-Bahl, Klaus Cappelaere, Bernard Cohard, Jean-Martial Demarty, Jérôme Diouf, Abdoul Aziz Falk, Ulrike Haas, Edwin Hiernaux, Pierre Kraus, David Roupsard, Olivier Scheer, Clemens Srivastava, Amit Kumar Tagesson, Torbern Grote, Rüdiger Modeling gas exchange and biomass production in West African Sahelian and Sudanian ecological zones |
| title | Modeling gas exchange and biomass production in West African Sahelian and Sudanian ecological zones |
| title_full | Modeling gas exchange and biomass production in West African Sahelian and Sudanian ecological zones |
| title_fullStr | Modeling gas exchange and biomass production in West African Sahelian and Sudanian ecological zones |
| title_full_unstemmed | Modeling gas exchange and biomass production in West African Sahelian and Sudanian ecological zones |
| title_short | Modeling gas exchange and biomass production in West African Sahelian and Sudanian ecological zones |
| title_sort | modeling gas exchange and biomass production in west african sahelian and sudanian ecological zones |
| topic | production biomass ecological zones gas exchange biomass production |
| url | https://hdl.handle.net/10568/129272 |
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