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| Registros recuperados: 51 | |
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| Cochrane,T.T.; Cochrane,Thomas. A.. |
| Conflicting opinions are recorded in the literature concerning the suitability of Amazon lands for sustainable agriculture following deforestation. This article has been written to shed light on this question by summarizing climate, landform, soil and vegetation features from the findings of a land resource study of the Brazilian state of Rondônia in south-west Amazonia. The work, which followed the World Soils and Terrain Digital Database (SOTER) methodology, was financed by the World Bank. During the course of the survey special emphasis was given to studying soils; 2914 profiles were analyzed and recorded. The study identified a complex pattern of land units with clear differences in climate, landform, soils and native vegetation. Forested areas mosaic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soils; Rondônia; Land resources; Fertility. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672006000100011 |
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| Marimon,Beatriz Schwantes; Felfili,Jeanine Maria; Lima,Edson de Souza; Duarte,Wânia M. Gonçalves; Marimon-Júnior,Ben Hur. |
| Natural regeneration and structure and their relationship to environmental variables were studied in three sections of a gallery forest, in Eastern Mato Grosso, Brazil (14º43′S and 52º21′W). The assumption was that natural regeneration is constrained by environmental determinants at all stages of development of the tree community. The objective was to analyse the forest structure and to verify the relationship between species distribution and abundance at different stages of regeneration and environmental variables. In each section, 47 contiguous (10x10m) permanent plots were established to sample trees (gbh≥15cm), following a systematic design. Seedlings (0.01 to 1m height), saplings (1.01 to 2m) and poles (from 2.01m height to gbh<15cm) were sampled... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazil; Diversity; Riparian forest; Soils; Tropics. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672010000100014 |
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| Oliveira,Sonia M.B. de; Pessenda,Luiz C.R.; Gouveia,Suzy E.M.; Favaro,Deborah I.T.. |
| This paper examines the role of parent rock, pedogenetic processes and airborne pollution in heavy metal accumulation in soils from a remote oceanic island, Fernando de Noronha, Brazil. We studied five soil profiles developed from different volcanic rocks. Mineralogical composition and total concentrations of major and trace elements were determined in 43 samples. The obtained concentrations range for heavy metals were: Co: 26-261 ppm; Cu: 35-97 ppm; Cr: 350-1446 ppm; Ni: 114-691 ppm; Zn: 101-374 ppm; Hg: 2-150 ppb. The composition of soils is strongly affected by the geochemical character of the parent rock. Pedogenesis appears to be responsible for the accumulation of Zn, Co, and, to a lesser extent, of Ni and Cu, in the upper, Mn- and organic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Soils; Anthropogenic mercury; Fernando de Noronha. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400007 |
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| Becegato,Valter Antonio; Ferreira,Francisco José Fonseca; Cabral,João Batista Pereira; Rafaelli Neto,Sílvio Luis. |
| In this study the K, U and Th radionuclide concentrations were determined in a sugar cane plantation that received large quantities of fertilizer and gypsum. Geochemical data were obtained for the clay, iron and organic matter in the soil samples, taken from depths of 0-20 and 20-40 cm. The average radionuclide concentrations were 71 Bq Kg-1 for K; 5.97 Bq Kg-1 for U, and 11.26 Bq Kg-1 for Th, and the uranium was variable (56%). The radionuclide average concentrations for the different fertilizer compositions varied in the range of 603.5 - 8855.0 Bq Kg-1 for K; 27.3 - 684.4 Bq Kg-1 for U, and 58 - 788.5 Bq Kg-1 for Th, and it was most variable for K (53%). Gypsum average concentrations were 82.6 Bq Kg-1 for K, 641.5 Bq Kg-1 for U, and 201.7 Bq Kg-1 for Th,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertilizers; Soils; Radionuclides; Gamma-ray spectrometry. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100001 |
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| Becegato,Valter Antonio; Ferreira,Francisco José Fonseca; Machado,William César Pollonio. |
| Gamma spectrometric measurements were obtained for the agricultural soils aiming at characterizing the spatial distribution of radionuclide concentrations (K, eU and eTh), as well for the samples of phosphatic fertilizers and agricultural gypsum. In the study areas, three types of soils occured: Eutrophic Red Nitosol (Alfisoil), Eutroferric Red Latosol of clayey texture (Oxisoil) and Dystrophic Red Latosol of medium texture (Oxisoil). The results showed that the radionuclide concentrations in more clayey soils were higher than in more sandy soils, mainly as a function of a higher adsorption capacity of the former. For the area where human activity predominated, the average contents of K, eU and eTh were respectively 54.75; 10.22 and 7.27 Bq/Kg,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gamma-rays spectrometry; Soils; Fertilizers. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000600022 |
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| Cruz,Lútecia Hiera da; Santana,Henrique de; Zaia,Cássia Thaïs Bussamra Vieira; Zaia,Dimas Augusto Morozin. |
| This work showed that the adsorption of glyphosate (GPS) depends on surface area for clays and amount of clays and CEC for soils. Organic matter (OM) had a secondary role in the adsorption of GPS on soils. The adsorption of GPS on soils from Londrina and Floraí counties and clays (montmorillonite, kaolinite) decreased when pH increased, however, for bentonite clay and soil from Tibagi county was kept constant. For the soils, the competitive adsorption between GPS and phosphate showed that displace of GPS by phosphate was related to the amount of clays, CEC and pH. GPS was not easily displaced by phosphate on the clays. The FT-IR spectra of the soils and clays showed that soil from Londrina resembled kaolinite. Thus, this could explain the results of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glyphosate; Adsorption; Clays; Soils. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000300004 |
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| Biffi, Pedro Victor Barreto; Rossin, Sergio; Valerio, Mario. |
| In this project "space-temporary Analysis of the landscape in the basin Dos Afonsos" was analyzed the patterns of change of use of the soils and the fragmentation of the wood, located in the basin Dos Afonsos, and inside the limits of the Redençao da Serra district that belongs to the Região do Vale do Paraíba-SP state. For it a was carried out an multitemporal analyzed on an area approximated of 6802,59 of hectares, using for that program SPRING, for the image of Landsat processing of the followings years 1984, 1994, 2005 and the images of CBERS of the 2005 years The analysis of detection of changes was made for the followings classes: Lake - Lagoon, Macrophytes, Wood, Grass, degraded Grass, implanted Grass, Burned, reforests and Bare soils. Concluding... |
| Tipo: Article |
Palavras-chave: Remote sensing; Soils; Processamento de imagens; Sensoriamento remoto; The basin; Image processing. |
| Ano: 2007 |
URL: http://hdl.handle.net/2315/111 |
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| Cruz Pons, Alfredo de la. |
| La actividad industrial y agrícola pueden ser fuentes de metales pesados que en concentraciones críticas en los suelos afectan el desarrollo de las plantas. En la Chontalpa, Tabasco, el cultivo de la caña de azúcar es importante por su extensión, producción de azúcar y la generación de empleos. En las zonas de abastecimiento del cultivo, existen dos ingenios azucareros que emiten gases a la atmósfera durante la zafra, así como una batería de separación de hidrocarburos que durante muchos años emitió gases a la atmósfera. La presente investigación se planteó como objetivos determinar el contenido de metales pesados en suelos y hojas de caña de azúcar en la zona cañera de la Chontalpa cercanos a la actividad petrolera y agroindustrial. El muestreo se realizó... |
| Tipo: Tesis |
Palavras-chave: Metales pesados; Caña de azúcar; Suelos; Maestría; Producción Agroalimentaria en el Trópico.; Heavy metals; Sugar cane; Soils. |
| Ano: 2008 |
URL: http://hdl.handle.net/10521/1637 |
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| Estrada Herrera, Isabel del Rayo. |
| Con el propósito de analizar el potencial de captura en la parte aérea del sistema MIAF (Milpa Intercalada con Árboles Frutales) y PAP (Parcelas de Alta Productividad), los suelos más representativos fueron investigados y clasificados de acuerdo con los sistemas Taxonomía de Suelos (Soil Survey Staff, 2003) y WRB (FAO-ISRIC-SICS, 1999); de acuerdo con el primer sistema, los suelos de las tres microcuencas se clasificaron como Inceptisoles; los de las microcuenca Mazateca y Mixe, fueron Humic Dystrudepts y el de la Cuicateca Typic Hapludepts. De acuerdo al segundo, los dos primeros resultaron ser Umbrisoles con propiedades ferrálicas y el de la Cuicateca un Cambisol hiperferrálico. Otro objetivo de esta investigación fue estimar el contenido de carbono en... |
| Tipo: Tesis |
Palavras-chave: Carbono; Suelos; Clasificación; Biomasa aérea; Fraccionamiento; Maestría; Edafología; Carbon; Soils; Classification; Aerial biomass; Fractioning.. |
| Ano: 2007 |
URL: http://hdl.handle.net/10521/1560 |
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| Magalhães,Esner R. S.; Freitas,Carlos E. de C.; Neves Junior,Afrânio F.; Silva Filho,Francisco C. da. |
| ABSTRACT The aim of this work was to evaluate the effects of variations in soil compaction on the stability of the slope embankments of fish farms used in aquaculture. Computational modeling was performed using the RocScience Slide 6.0 program, simulating filling scenarios, fast lowering and stationary regimes for the full operation of the fish farms. The data used in these simulations were obtained from soil characterization tests in the laboratory. The geometry of the levees, the inclination of the slopes and the crest width and height, also necessary for modeling, were obtained from field data and technical projects. The modeling generated a safety factor (SF) for the upstream and downstream slopes of the levees, considering different upstream slopes,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquaculture; Fish farming; Soils; Levees; Stability. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000500555 |
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| Registros recuperados: 51 | |
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