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| Registros recuperados: 44 | |
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| Vendrame,Pedro R.S.; Brito,Osmar R.; Guimarães,Maria F.; Martins,Éder S.; Becquer,Thierry. |
| The Cerrado region, with over 50 million hectares of cultivated pasture, provides 55% of Brazilian beef production. Previous investigations have shown that about 70-80% of this pasture is affected by some kind of degradation, leading to low productivity. However, until now, few surveys have been carried out on a regional scale. The aim of the present work is both to assess the fertility and acidity levels of Cerrado soils under pasture and compare the variability of the soils characteristics on a regional scale. Two soil depths were sampled in different places within the studied area: (1) a surface horizon (0.0-0.2 m) in order to evaluate its fertility and acidity status for pasture, and (2) a subsurface horizon (0.6-0.8 m), used for classification. Most... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cation exchange capacity; Exchangeable aluminum; Phosphorus availability; Soil degradation; Total carbon. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400026 |
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| Salemi,Luiz Felippe; Lins,Silvia Rafaela Machado; Ravagnani,Elizabethe de Campos; Magioli,Marcelo; Martinez,Melissa Gaste; Guerra,Fernando; Vidas,Natassia Bonini; Fransozi,Aline; Ferraz,Silvio Frosini de Barros; Martinelli,Luiz Antonio. |
| Abstract In this article, by using carbon stable isotopes, we assessed the past and present land use influences that riparian areas are subject within agricultural landscapes. Emphasis is given to the understanding of the effects of the 2012 Brazilian Forest Act on such areas. We selected five riparian areas within a highly C4 dominated agricultural landscape. Three of them had 30 meters native riparian forest buffer (NRFB) and two of them had 8 meter and no NRFB. We used three 100 meter-transects located 5, 15 and 30 meters relative to stream channel to obtain soil samples (0 - 10 cm). All riparian areas presented soil carbon isotopic signatures that are not C3 (native forests) irrespective of having or not 30 meters NRFB. Two cases presenting less than... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Watershed; Soil degradation; Organic matter; Sediment; Carbon cycling. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000200210 |
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| Santiago,André Luiz Cabral Monteiro de Azevedo; Santos,Paulo Jorge Parreira dos; Maia,Leonor Costa. |
| Nineteen taxa of Mucorales, belonging to Absidi, Apophysomyces, Cunninghamella, Fennellomyces, Lichtheimi, Mucor, Mycotypha, Rhizopus and Syncephalastrum were isolated from 36 composite soil samples in three semiarid areas in the State of Pernambuco (Triunfo, Cabrobó and Belém de São Francisco), Northeast Brazil, which are characterized by Caatinga vegetation. Triunfo is preserved, whereas Cabroró and Belém de São Francisco are experiencing low and severe desertification processes, respectively. Mucorales were isolated in Petri dishes in triplicate from 5 mg samples of soil placed on the surface of wheat germ agar plus chloramphenicol and Cercobin [Dimethyl 4,49-(103 phenylene) bis (3-thioallophanate)] medium. The plates were left on a bench at room... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodiversity; Caatinga; Mucoromycotina; Soil degradation; Taxonomy. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000100044 |
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| Filipová,Ladislava; Hédl,Radim; Covacevich C.,Nilo. |
| The wetland meadows and pastures (vegas) of the agricultural zone of the Magallanes Region and the Chilean Patagonia are productive and intensively exploited ecosystems. However, there is scarce data about the typology and the physical and chemical properties of the soils that determine the agricultural potential of vegas sites. Sampling of the main horizons of 47 soil profiles was conducted throughout the area. The profiles were described in the field and consequently classified according to the soil typology system of the WRB (IUSS Working Group WRB, 2006). Analyses of bulk and particle densities, capillary water capacity, pH (H2O), pH (CaCl2), texture, organic material, C:N ratio, electrical conductivity, effective cation exchange capacity, N, P,... |
| Tipo: Journal article |
Palavras-chave: Histosols; Fluvisols; Peat; Soil properties; Salinization; Soil degradation. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200010 |
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| Varón-Ramírez,Viviana Marcela; Camacho-Tamayo,Jesús Hernán; González-Nivia,Janeth. |
| ABSTRACT The physical characteristics of the soil are defined through the interaction between its properties, and they, in turn, can indicate its physical quality. The study area is located in the Centro Agropecuário Marengo (Marengo Agricultural Center), with an extension of 94.5 ha, subdivided into 17 plots. The objective of this research was to study characteristics such as water storage capacity, structure, consistency, and soil compaction in the two surface horizons (H1 and H2), in order to define management zones through the soil index. Properties such as soil penetration resistance were an indicator of soil degradation, with values higher than 2 MPa in 13 plots. The total porosity exhibited medium or low values in the H1 and H2 horizons, with a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil degradation; Soil compaction; Soil water storage; Soil index.. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000300248 |
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| Jaramillo-Barrios,Camilo Ignacio; Ortiz-Rico,Andrés Felipe; Carrillo,Gustavo Alfonso Araujo; Varón-Ramírez,Viviana Marcela. |
| ABSTRACT Soils have the ability to maintain plant growth and biological activity due to their physical and chemical properties. The aim of this study was to observe the spatial distribution of some chemical properties of the soil, such as pH, organic matter (OM), electrical conductivity (EC), effective cation exchange capacity (ECEC), sulfur (S) and aluminum (Al) content and to establish zones with homogeneous chemical characteristics using the MULTISPATI-PCA technique and the fuzzy c-means algorithm. The study area was located in the Tundama and Sugamuxi Valleys (Boyacá, Colombia) with an area of 8,017 ha. Chemical properties such as pH, OM, EC, S, Al, and ECEC were indicators of the chemical degradation of these soils. Four homogeneous zones were... |
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Palavras-chave: Geostatistics; Semivariogram; Soil degradation; Multispati-PCA; Spatial distribution.. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542019000100216 |
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| Olivetti,Diogo; Mincato,Ronaldo Luiz; Ayer,Joaquim Ernesto Bernardes; Silva,Marx Leandro Naves; Curi,Nilton. |
| Water erosion is one of the most important soil degradation processes and it can be intensified by land use and vegetal covering changes. Thus, water erosion modeling studies associated to multi temporal analyses of land use are effective in assessing how changes in land cover affects sediment yield. Therefore, considering the modifications in the land use from 1986 to 2011, the aim of this study ranged to estimate water erosion rates and compare them to the soil loss tolerance (SLT) limit in the Latosols (Oxisols) at Ribeirão Caçús sub-basin, in the South of Minas Gerais State, Southeast Brazil, by means of the Revised Universal Soil Loss Equation (RUSLE) in association with the geographic information system (GIS), and geostatistical techniques. So, for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Land use changes; RUSLE; Soil loss prediction; Soil degradation. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000100058 |
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| Como recuperar uma voçoroca a baixo custo? Atividades necessárias antes da implantação das estratégias de controle de erosão. Implantação de estratégias físicas de controle da erosão. Determinação da declividade da área; Com nível retangular; Cálculo da distância entre os terraços; Demarcação e locação dos terraços; Com instrumentos alternativos; Com nível óptico; Determinação do escoamento superficial (Q); Dimensionamento das estruturas físicas; Terraços; Bacias de retenção; Paliçadas; Considerações sobre a forma da encosta ou morro; Revegetação de voçorocas com leguminosas arbóreas inoculadas com microrganismos; Por que utilizar espécies leguminosas? Quais espécies plantar? Preparo e plantio das mudas no campo; Custos de recuperação de uma voçoroca;... |
| Tipo: Livros |
Palavras-chave: Degradação do solo; Erosion; Erosão; Soil degradation. |
| Ano: 2006 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/629509 |
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| ARAÚJO, F. P. de; BRANDAO, W. N.; MOREIRA, J. N.; TAURA, T. A.; CUNHA, T. J. F.; CORREIA, R. C.. |
| A produção de energia elétrica sustentável por meio da instalação das torres eólicas, no município de Casa Nova, BA, a exemplo de outras localidades, é uma realidade e, se por um lado produz uma energia limpa, por outro lado, necessita construir estradas vicinais cascalhadas, objetivando o transporte das referidas torres, que são constituídas por peças longas e bastante pesadas, que por sua vez exigem caminhões de grande porte. Para a pavimentação foram utilizadas seis jazidas prospectadas, aleatoriamente, dentro da área dos parques no município, que resultaram na retirada de toda avegetação de uma área total de 16,5 hectares, com exceção das espécies ameaçadas de extinção a exemplo do umbuzeiro (Spondias tuberosa Arr.),baraúna (Schinopsis brasiliensis) e... |
| Tipo: Folhetos |
Palavras-chave: Semiárdio; Jazida; Lago de Sobradinho; Torre Eólica; Caatinga; Solo; Degradação Ambiental; Recuperação do Solo; Cobertura Vegetal; Manejo do Solo; Manejo de Água; Natural resources; Arid soils; Soil degradation; Soil management; Soil mineralogy; Soil organic matter; Soil resource management. |
| Ano: 2020 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1124092 |
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| Registros recuperados: 44 | |
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