Agricultural land is the main source of stream sediments after conversion of an African montane forest
In many parts of Africa, soil erosion is an important problem, which is evident from high sediment yields in tropical montane streams. Previous studies in Kenya pointed to a large contribution from catchments cultivated by smallholder farmers. This led to the hypothesis that unpaved tracks and gulli...
| Autores principales: | , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Springer
2020
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/114403 |
| _version_ | 1855542266806927360 |
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| author | Stenfert Kroese, J. Batista, P.V.G. Jacobs, S.R. Breuer, Lutz Quinton, J.N. Rufino, Mariana C. |
| author_browse | Batista, P.V.G. Breuer, Lutz Jacobs, S.R. Quinton, J.N. Rufino, Mariana C. Stenfert Kroese, J. |
| author_facet | Stenfert Kroese, J. Batista, P.V.G. Jacobs, S.R. Breuer, Lutz Quinton, J.N. Rufino, Mariana C. |
| author_sort | Stenfert Kroese, J. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | In many parts of Africa, soil erosion is an important problem, which is evident from high sediment yields in tropical montane streams. Previous studies in Kenya pointed to a large contribution from catchments cultivated by smallholder farmers. This led to the hypothesis that unpaved tracks and gullies are the main sediment sources in smallholder agriculture catchments of the highlands of Kenya. The aim of this study was to investigate the sediment sources with sediment fingerprinting to generate the knowledge base to improve land management and to reduce sediment yields. Four main sediment sources (agricultural land, unpaved tracks, gullies and channel banks) and suspended sediments were analysed for biogeochemical elements as potential tracers. To apportion the catchments target sediment to different sources, we applied the MixSIAR un-mixing modelling under a Bayesian framework. Surprisingly, the fingerprinting analysis showed that agricultural land accounted for 75% (95% confidence interval 63–86%) of the total sediment. Channel banks contributed 21% (8–32%), while the smallest contributions to sediment were generated by the unpaved tracks and gullies with 3% (0–12%) and 1% (0–4%), respectively. Erosion management strategies should target agricultural lands with an emphasis on disconnecting unpaved tracks form hillslope source areas to reduce sediment yields to Lake Victoria. |
| format | Journal Article |
| id | CGSpace114403 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | CGSpace1144032025-12-08T09:54:28Z Agricultural land is the main source of stream sediments after conversion of an African montane forest Stenfert Kroese, J. Batista, P.V.G. Jacobs, S.R. Breuer, Lutz Quinton, J.N. Rufino, Mariana C. agricultural land mountain areas catchment hydrology In many parts of Africa, soil erosion is an important problem, which is evident from high sediment yields in tropical montane streams. Previous studies in Kenya pointed to a large contribution from catchments cultivated by smallholder farmers. This led to the hypothesis that unpaved tracks and gullies are the main sediment sources in smallholder agriculture catchments of the highlands of Kenya. The aim of this study was to investigate the sediment sources with sediment fingerprinting to generate the knowledge base to improve land management and to reduce sediment yields. Four main sediment sources (agricultural land, unpaved tracks, gullies and channel banks) and suspended sediments were analysed for biogeochemical elements as potential tracers. To apportion the catchments target sediment to different sources, we applied the MixSIAR un-mixing modelling under a Bayesian framework. Surprisingly, the fingerprinting analysis showed that agricultural land accounted for 75% (95% confidence interval 63–86%) of the total sediment. Channel banks contributed 21% (8–32%), while the smallest contributions to sediment were generated by the unpaved tracks and gullies with 3% (0–12%) and 1% (0–4%), respectively. Erosion management strategies should target agricultural lands with an emphasis on disconnecting unpaved tracks form hillslope source areas to reduce sediment yields to Lake Victoria. 2020-09-30 2020-10-27T09:22:13Z 2020-10-27T09:22:13Z Journal Article https://hdl.handle.net/10568/114403 en Open Access Springer Kroese, J.S., Batista, P.V., Jacobs, S.R., Breuer, L., Quinton, J.N. and Rufino, M.C., 2020. Agricultural land is the main source of stream sediments after conversion of an African montane forest. Scientific reports, 10(1), 14827. https://doi.org/10.1038/s41598-020-71924-9 |
| spellingShingle | agricultural land mountain areas catchment hydrology Stenfert Kroese, J. Batista, P.V.G. Jacobs, S.R. Breuer, Lutz Quinton, J.N. Rufino, Mariana C. Agricultural land is the main source of stream sediments after conversion of an African montane forest |
| title | Agricultural land is the main source of stream sediments after conversion of an African montane forest |
| title_full | Agricultural land is the main source of stream sediments after conversion of an African montane forest |
| title_fullStr | Agricultural land is the main source of stream sediments after conversion of an African montane forest |
| title_full_unstemmed | Agricultural land is the main source of stream sediments after conversion of an African montane forest |
| title_short | Agricultural land is the main source of stream sediments after conversion of an African montane forest |
| title_sort | agricultural land is the main source of stream sediments after conversion of an african montane forest |
| topic | agricultural land mountain areas catchment hydrology |
| url | https://hdl.handle.net/10568/114403 |
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