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| Lima,Augusto Miguel Nascimento; Silva,Ivo Ribeiro da; Stape,Jose Luis; Mendonça,Eduardo Sá; Novais,Roberto Ferreira; Barros,Nairam Félix de; Neves,Júlio César Lima; Paul,Keryn; Schulthais,Fernanda; Polglase,Phill; Raison,John; Soares,Emanuelle Mercês Barros. |
| Soil organic matter (SOM) plays an important role in carbon (C) cycle and soil quality. Considering the complexity of factors that control SOM cycling and the long time it usually takes to observe changes in SOM stocks, modeling constitutes a very important tool to understand SOM cycling in forest soils. The following hypotheses were tested: (i) soil organic carbon (SOC) stocks would be higher after several rotations of eucalyptus than in low-productivity pastures; (ii) SOC values simulated by the Century model would describe the data better than the mean of observations. So, the aims of the current study were: (i) to evaluate the SOM dynamics using the Century model to simulate the changes of C stocks for two eucalyptus chronosequences in the Rio Doce... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil organic matter; Land use change; Reforestation. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300018 |
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| Gebrim,Fabrício de Oliveira; Novais,Roberto Ferreira; Silva,Ivo Ribeiro da; Schulthais,Fernanda; Vergütz,Leonardus; Procópio,Lorena Costa; Moreira,Frederico Fonseca; Jesus,Guilherme Luiz de. |
| The eutrophication of aquifers is strongly linked to the mobility of P in soils. Although P mobility was considered irrelevant in a more distant past, more recent studies have shown that P, both in organic (Po) and inorganic forms (Pi), can be lost by leaching and eluviation through the soil profile, particularly in less weathered and/or sandier soils with low P adsorption capacity. The purpose of this study was to determine losses of P forms by leaching and eluviation from soil columns. Each column consisted of five PVC rings (diameter 5 cm, height 10 cm), filled with two soil types: a clayey Red-Yellow Latosol and a sandy loam Red-Yellow Latosol, which were exposed to water percolation. The soils were previously treated with four P rates (as KH2PO4 ) to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eutrophication; Environmental critical level; Mehlich-1; Olsen. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000400019 |
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