Land-use change and Biogeochemical controls of soil CO2, N2O and CH4 fluxes in Cameroonian forest landscapes
Deforestation and land-use change are accelerating in the Congo Basin and elsewhere in the tropics affecting the soil-atmosphere exchange of greenhouse gases (GHG). There is a lack of data from Central Africa. We quantified fluxes of CO2, CH4, and N2O at the soil-atmosphere interface in a secondary...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Informa UK Limited
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/112480 |
| _version_ | 1855543705061031936 |
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| author | Verchot, Louis V. Dannenmann, Michael Kengdo, S.K. Njine-Bememba, C.B. Rufino, Mariana C. Sonwa, D.J. Tejedor, J. |
| author_browse | Dannenmann, Michael Kengdo, S.K. Njine-Bememba, C.B. Rufino, Mariana C. Sonwa, D.J. Tejedor, J. Verchot, Louis V. |
| author_facet | Verchot, Louis V. Dannenmann, Michael Kengdo, S.K. Njine-Bememba, C.B. Rufino, Mariana C. Sonwa, D.J. Tejedor, J. |
| author_sort | Verchot, Louis V. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Deforestation and land-use change are accelerating in the Congo Basin and elsewhere in the tropics affecting the soil-atmosphere exchange of greenhouse gases (GHG). There is a lack of data from Central Africa. We quantified fluxes of CO2, CH4, and N2O at the soil-atmosphere interface in a secondary forest, a cocoa agroforest, and an unfertilized cropland. Soil respiration was highest in the secondary forest (15.37 ± 3.42 Mg C ha−1 y−1), intermediate in the cacao agroforest (12.26 ± 2.91 Mg C ha−1 y−1) and the lowest in the unfertilized cropland (8.74 ± 2.62 Mg C ha−1 y−1). Likewise, N2O fluxes were highest in the secondary forest (2.17 ± 0.20 kg N ha−1 y−1), intermediate in the cacao agroforest (1.40 ± 0.08 kg N ha−1 y−1) and lowest in the unfertilized cropland (1.04 ± 0.15 kg N ha−1 y−1). Soils were a sink for atmospheric CH4 and sink strength was high in the secondary forest (−3.60 ± 1.83 kg CH4 ha−1 y−1) and cacao agroforest (−3.61 ± 2.09 kg CH4 ha−1 y−1) and low in the unfertilized cropland (−1.9 ± 1.59 kg CH4 ha−1 y−1). Variation in soil water content rather than temperature was the dominant driver of seasonal variations of the fluxes at all study sites and N availability affected both N2O and CH4 fluxes. Our results suggest that tropical land-use change is decreasing soil respiration, decreasing the strength of the soil CH4 sink and decreasing N2O emissions, in landscapes that do not practice agriculture with chemical fertilization. |
| format | Journal Article |
| id | CGSpace112480 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| publisher | Informa UK Limited |
| publisherStr | Informa UK Limited |
| record_format | dspace |
| spelling | CGSpace1124802024-10-03T07:41:01Z Land-use change and Biogeochemical controls of soil CO2, N2O and CH4 fluxes in Cameroonian forest landscapes Verchot, Louis V. Dannenmann, Michael Kengdo, S.K. Njine-Bememba, C.B. Rufino, Mariana C. Sonwa, D.J. Tejedor, J. land use change greenhouse gas emissions soil respiration Deforestation and land-use change are accelerating in the Congo Basin and elsewhere in the tropics affecting the soil-atmosphere exchange of greenhouse gases (GHG). There is a lack of data from Central Africa. We quantified fluxes of CO2, CH4, and N2O at the soil-atmosphere interface in a secondary forest, a cocoa agroforest, and an unfertilized cropland. Soil respiration was highest in the secondary forest (15.37 ± 3.42 Mg C ha−1 y−1), intermediate in the cacao agroforest (12.26 ± 2.91 Mg C ha−1 y−1) and the lowest in the unfertilized cropland (8.74 ± 2.62 Mg C ha−1 y−1). Likewise, N2O fluxes were highest in the secondary forest (2.17 ± 0.20 kg N ha−1 y−1), intermediate in the cacao agroforest (1.40 ± 0.08 kg N ha−1 y−1) and lowest in the unfertilized cropland (1.04 ± 0.15 kg N ha−1 y−1). Soils were a sink for atmospheric CH4 and sink strength was high in the secondary forest (−3.60 ± 1.83 kg CH4 ha−1 y−1) and cacao agroforest (−3.61 ± 2.09 kg CH4 ha−1 y−1) and low in the unfertilized cropland (−1.9 ± 1.59 kg CH4 ha−1 y−1). Variation in soil water content rather than temperature was the dominant driver of seasonal variations of the fluxes at all study sites and N availability affected both N2O and CH4 fluxes. Our results suggest that tropical land-use change is decreasing soil respiration, decreasing the strength of the soil CH4 sink and decreasing N2O emissions, in landscapes that do not practice agriculture with chemical fertilization. 2020-12-29 2021-03-08T08:33:55Z 2021-03-08T08:33:55Z Journal Article https://hdl.handle.net/10568/112480 en Open Access Informa UK Limited Verchot, L.V., Dannenmann, M., Kengdo, S.K., Njine-Bememba, C.B., Rufino, M.C., Sonwa, D.J. and Tejedor, J., 2020. Land-use change and Biogeochemical controls of soil CO2, N2O and CH4 fluxes in Cameroonian forest landscapes. Journal of Integrative Environmental Sciences. https://doi.org/10.1080/1943815X.2020.1779092 |
| spellingShingle | land use change greenhouse gas emissions soil respiration Verchot, Louis V. Dannenmann, Michael Kengdo, S.K. Njine-Bememba, C.B. Rufino, Mariana C. Sonwa, D.J. Tejedor, J. Land-use change and Biogeochemical controls of soil CO2, N2O and CH4 fluxes in Cameroonian forest landscapes |
| title | Land-use change and Biogeochemical controls of soil CO2, N2O and CH4 fluxes in Cameroonian forest landscapes |
| title_full | Land-use change and Biogeochemical controls of soil CO2, N2O and CH4 fluxes in Cameroonian forest landscapes |
| title_fullStr | Land-use change and Biogeochemical controls of soil CO2, N2O and CH4 fluxes in Cameroonian forest landscapes |
| title_full_unstemmed | Land-use change and Biogeochemical controls of soil CO2, N2O and CH4 fluxes in Cameroonian forest landscapes |
| title_short | Land-use change and Biogeochemical controls of soil CO2, N2O and CH4 fluxes in Cameroonian forest landscapes |
| title_sort | land use change and biogeochemical controls of soil co2 n2o and ch4 fluxes in cameroonian forest landscapes |
| topic | land use change greenhouse gas emissions soil respiration |
| url | https://hdl.handle.net/10568/112480 |
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