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    Characterisation of soil organic matter in the topsoils under rain forest and pastures in the eastern Brazilian Amazon Basin

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    S99ArtKoutikaCharacterizationInthomNodev.pdf (78.08Kb)
    Author
    Koutika, L.
    Andreux, F.
    Hassink, J.
    Chone, T.
    Cerri, C.C.
    Type
    Journal Article
    Metadata
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    Abstract/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.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/4024
    IITA Subjects
    Soil Information; Climate Change; Soil Fertility
    Agrovoc Terms
    Decomposition; Forest; Organic Matter; Pastures; Particle Size; Top Soil
    Regions
    South America
    Countries
    Brazil
    Collections
    • Journal and Journal Articles4839
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