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Testoni,Samara Alves; Almeida,Jaime Antonio de; Silva,Luana da; Andrade,Gabriel Ramatis Pugliese. |
ABSTRACT Shrinkage capacity (caráter retrátil in Portuguese) is a new diagnostic characteristic recently introduced in the Brazilian System of Soil Classification (SiBCS) to indicate shrink and swell properties observed in subtropical soils from highland plateaus in southern Brazil, specifically in Oxisols with brown colors. In soils located in road cuts exposed to drying for some weeks, strong shrinkage of soil volume is observed in these soils, resulting in the formation of pronounced vertical cracks and large and very large prismatic structures, which crumble in blocks when handled. We hypothesize that such properties are related to their clay mineralogy, although there are no conclusive studies about this, the motive for the present study. Samples of... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Kaolinite-smectite; Interstratified clay mineral; X-ray diffraction; Quasicrystals. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100420 |
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Sixel,Ricardo Michael de Melo; Arthur Junior,José Carlos; Gonçalves,José Leonardo de Moraes; Alvares,Clayton Alcarde; Andrade,Gabriel Ramatis Pugliese; Azevedo,Antonio Carlos; Stahl,James; Moreira,Antônio Maurício. |
ABSTRACT The impact of intensive management practices on the sustainability of forest production depends on maintenance of soil fertility. The contribution of forest residues and nutrient cycling in this process is critical. A 16-year-old stand of Pinus taeda in a Cambissolo Húmico Alumínico léptico (Humic Endo-lithic Dystrudept) in the south of Brazil was studied. A total of 10 trees were sampled distributed in five diameter classes according to diameter at breast height. The biomass of the needles, twigs, bark, wood, and roots was measured for each tree. In addition to plant biomass, accumulated plant litter was sampled, and soil samples were taken at three increments based on sampling depth: 0.00-0.20, 0.20-0.40, 0.40-0.60, 0.60-1.00, 1.00-1.40,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil fertility; Nutrient cycling; Forest management. |
Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501416 |
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