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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of organic matter in topsoils under rain forest and pasture in the eastern Brazilian Amazon basin (1999)
    Springer
    Biology and fertility of soils 29 (1999), S. 309-313 
    Details
    ISSN: 1432-0789
    Keywords: Key words Decomposition rate ; Forest ; Organic matter characterization ; Pastures ; Particle-size fractions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050557
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  • 2
    Electronic Resource
    Electronic Resource
    Carbon decomposition of the topsoils and soil fractions under forest and pasture in the western Brazilian Amazon basin, Rondônia (2000)
    Springer
    Biology and fertility of soils 30 (2000), S. 284-287 
    Details
    ISSN: 1432-0789
    Keywords: Key words Carbon decomposition ; Forest ; Pastures ; Topsoils ; Rondônia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The topsoils of two sites, comprising natural forest and 4- and 20-year-old pastures, respectively, were selected in Rondônia to evaluate the changes of soil organic matter due to pasture establishment. These changes were evaluated by measuring the proportions of the C and N associated with clay and silt fractions, and by the C decomposition (CD) rate of the whole topsoils and their size fractions. The topsoils studied had large proportions of C and N associated with fine fractions, especially with clay fractions. The CD rate of the silt fractions was higher than that of the clay fractions under the two forest topsoils and under the 20-year-old pasture. The CD rate of the silt fractions under forest vegetation at each site was significantly higher than that of the silt fractions under pasture vegetation at the same site. The CD of clay fractions followed the same trend as the silt fractions, showing an improvement in the stability of C associated with clay and silt fractions under pasture vegetation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050004
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  • 3
    Electronic Resource
    Electronic Resource
    Factors influencing carbon decomposition of topsoils from the Brazilian Amazon Basin (1999)
    Springer
    Biology and fertility of soils 28 (1999), S. 436-438 
    Details
    ISSN: 1432-0789
    Keywords: Key words Brazilian Amazon Basin ; C decomposition ; Sand/clay ratio ; Topsoils ; Climate effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The influence of texture and local climate, especially precipitation, on C decomposition was evaluated in topsoils under forest and pastures at different sites located in the western, central, and eastern Brazilian Amazon Basin. Independent of the geographical location and vegetation cover, C decomposition was lower in topsoils of fine texture with a sand/clay ratio of less than 1, compared to topsoils of coarse a texture with a sand/clay ratio ranging from 2 to 8. In the former, the low sand/clay ratio appears to reduce C decomposition. In the latter, besides the effect of the high sand/clay ratio, the local climate, especially the annual precipitation, seems to play an important role in controlling C decomposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050517
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