características de solos construídos após mineração de carvão relacionadas ao processo de construção e à composição do material utilizado constructed soils characteristics after coal mining related to construction process and to material composition utilized
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Abstract
Coal stripmining involves the removal of upper soil and geological layers, which must be relocated in a similar way that in the original profile when reconstructing the landscape. As this process changes soil and landscape characteristics, this study evaluated changes related to composition of materials and construction process in soils reconstructed 2 and 24 years ago, in Boa Vista Coal Mining, in Minas do Leão, Rio Grande do Sul, Brazil. The construction processes were evaluated by morphologic characteristics, soil density, saturated hydraulic conductivity, soil water infiltration capacity, particle size distribution, cation exchange capacity, carbon content, and neutralization and acidification potential. In both reconstructed areas, the construction process increased soil density and reduced both saturated soil hydraulic conductivity and soil water infiltration. No significant difference was found between sample sets of 2 and 24 years for particle size distribution, cation exchange capacity and carbon content, indicating that construction processes and the materials were similar. The decrease of neutralization and acidification potentials in soils built 24 years ago indicated an increase in sulfurization as time since soil reconstruction increases. Due to alterations in soils, both areas present serious limitations for vegetation development, influencing negatively the recovery of mining sites and adjacent areas.
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quinnes2008cinciacaractersticas
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| Journal | Trials |
| Year | 2008 |
| DOI |
10.1590/S0103-84782008000600012
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