Characterisation of soil organic matter in the topsoils under rain forest and pastures in the eastern Brazilian Amazon Basin
In topsoils under forest and 7-, 12- and 17-year-old pastures, organic matter was characterized by analysing C and N distribution in particle-size fractions, the C decomposition rates of soil and particle-size fractions and by employing density-fractionation of macro-organic matter (>150 μm). The C...
| Autores principales: | , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
1999
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/96017 |
| _version_ | 1855527178244980736 |
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| author | Koutika, L. Andreux, F. Hassink, J. Chone, T. Cerri, C.C. |
| author_browse | Andreux, F. Cerri, C.C. Chone, T. Hassink, J. Koutika, L. |
| author_facet | Koutika, L. Andreux, F. Hassink, J. Chone, T. Cerri, C.C. |
| author_sort | Koutika, L. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | In topsoils under forest and 7-, 12- and 17-year-old pastures, organic matter was characterized by analysing C and N distribution in particle-size fractions, the C decomposition rates of soil and particle-size fractions and by employing density-fractionation of macro-organic matter (>150 μm). The C and N associated with clay fractions increased with increasing age of pasture. The weight (%) of macro-organic matter and its heavy fractions (>1.37 g cm–3) also increased with increasing age of pasture. However, in a long-term incubation (100 days), these changes seemed to involve an increase in the C decomposition rate in the topsoil of the oldest pasture. Using the C decomposition rates of particle-size fractions, it appeared that silt and clay contributed differently to C decomposition in the whole soil. C associated with silt contributed to the C decomposition rate during the first 40 days of incubation, while C associated with clay contributed to C decomposition in the long-term incubation (after 40 days), especially when the clay fraction appeared to reach saturation point with respect to its ability to bind organic compounds and thus protect the soil from C loss. |
| format | Journal Article |
| id | CGSpace96017 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1999 |
| publishDateRange | 1999 |
| publishDateSort | 1999 |
| record_format | dspace |
| spelling | CGSpace960172023-06-12T14:33:25Z Characterisation of soil organic matter in the topsoils under rain forest and pastures in the eastern Brazilian Amazon Basin Koutika, L. Andreux, F. Hassink, J. Chone, T. Cerri, C.C. decomposition forest organic matter pastures particle size top soil In topsoils under forest and 7-, 12- and 17-year-old pastures, organic matter was characterized by analysing C and N distribution in particle-size fractions, the C decomposition rates of soil and particle-size fractions and by employing density-fractionation of macro-organic matter (>150 μm). The C and N associated with clay fractions increased with increasing age of pasture. The weight (%) of macro-organic matter and its heavy fractions (>1.37 g cm–3) also increased with increasing age of pasture. However, in a long-term incubation (100 days), these changes seemed to involve an increase in the C decomposition rate in the topsoil of the oldest pasture. Using the C decomposition rates of particle-size fractions, it appeared that silt and clay contributed differently to C decomposition in the whole soil. C associated with silt contributed to the C decomposition rate during the first 40 days of incubation, while C associated with clay contributed to C decomposition in the long-term incubation (after 40 days), especially when the clay fraction appeared to reach saturation point with respect to its ability to bind organic compounds and thus protect the soil from C loss. 1999 2018-07-05T06:30:27Z 2018-07-05T06:30:27Z Journal Article https://hdl.handle.net/10568/96017 en Limited Access Koutika, L.S., Andreux, F., Hassink, J., Choné, T. & Cerri, C.C. (1999). Characterization of organic matter in topsoils under rain forest and pasture in the eastern Brazilian Amazon basin. Biology and Fertility of Soils, 29(3), 309-313. |
| spellingShingle | decomposition forest organic matter pastures particle size top soil Koutika, L. Andreux, F. Hassink, J. Chone, T. Cerri, C.C. Characterisation of soil organic matter in the topsoils under rain forest and pastures in the eastern Brazilian Amazon Basin |
| title | Characterisation of soil organic matter in the topsoils under rain forest and pastures in the eastern Brazilian Amazon Basin |
| title_full | Characterisation of soil organic matter in the topsoils under rain forest and pastures in the eastern Brazilian Amazon Basin |
| title_fullStr | Characterisation of soil organic matter in the topsoils under rain forest and pastures in the eastern Brazilian Amazon Basin |
| title_full_unstemmed | Characterisation of soil organic matter in the topsoils under rain forest and pastures in the eastern Brazilian Amazon Basin |
| title_short | Characterisation of soil organic matter in the topsoils under rain forest and pastures in the eastern Brazilian Amazon Basin |
| title_sort | characterisation of soil organic matter in the topsoils under rain forest and pastures in the eastern brazilian amazon basin |
| topic | decomposition forest organic matter pastures particle size top soil |
| url | https://hdl.handle.net/10568/96017 |
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