Consulta: subjectFacets:"Hydromorphic soils"
Registros recuperados: 6
Data/hora: 13/06/2024 01:33:58

Amazonian former gold mined soils as a source of methylmercury: Evidence from a small scale watershed in French Guiana
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Guedron, Stephane; Grimaldi, Michel; Grimaldi, Catherine; Cossa, Daniel; Tisserand, Delphine; Charlet, Laurent.
Total mercury (HgT) and monomethylmercury (MMHg) were investigated in a tropical head watershed (1 km(2)) of French Guiana. The watershed includes a pristine area on the hill slopes and a former gold mined flat in the bottomland. Concentrations of dissolved and particulate HgT and MMHg were measured in rain, throughfall, soil water and at three points along the stream. Samples were taken in-between and during 14 storm events at the beginning and middle of the 2005 and 2006 rainy seasons. Dissolved and particulate HgT concentrations in the stream slightly increased downstream, while dissolved and particulate MMHg concentrations were low at the pristine sub-watershed outlet (median = 0.006 ng L-1 and 1.84 ng g(-1), respectively) and sharply increased at the...
Tipo: Text
Palavras-chave: Mercury; Methylmercury; Tropical watershed; Gold placers; Stream water; Oxisols; Hydromorphic soils.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00035/14628/12134.pdf

Soil quality indicators after conversion of “murundu” fields into no-tillage cropping in the Brazilian Cerrado
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Souza,Edicarlos Damacena de; Silva,Camila Rodrigues Menezes da; Pinto,Flávio Araújo; Carneiro,Marco Aurélio Carbone; Paulino,Helder Barbosa; Pacheco,Leandro Pereira; Terra,Flávia Dias; Laroca,Jackeline Vieira dos Santos.
Abstract: The objective of this work was to evaluate changes in soil quality due to different times of adoption of the no-tillage system in “murundu” (mound) fields converted to agriculture, as well as to identify the best indicators to explain these changes. The study was carried out on a Plinthic Altisol, in the municipality of Portelândia, in the state of Goiás, Brazil. The treatments consisted of different times of conversion and of adoption of the no-tillage system - 8, 12, and 17 years - and of native area between the mounds and on top of the mounds (reference area). After 17 years of the adoption of no-tillage, there was an increase in organic carbon and nitrogen, as well as in their particulate fractions in relation to the reference area. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydromorphic soils; Microbial biomass; Organic matter; Plinthosols.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000103801

Characteristics of Soils in Highland Wetlands as a Subsidy to Identifying and Setting their Limits
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Warmling,Maria Tereza; Albuquerque,Jackson Adriano; Almeida,Jaime Antonio de; Warmling,Maria Izabel.
ABSTRACT Palustrine areas and wetlands in particular are fragile ecosystems, with high biodiversity and high ecological productivity, and they provide benefits to society. The aim of this study was to describe and classify the main soils occurring in the wetlands of the Southern Plateau of Santa Catarina, and propose criteria for identification of hydromorphic environments as an aid in demarcation of their boundaries. Soils of four wetlands, in the municipalities of Bom Jardim da Serra, Bom Retiro, Lages, and Painel were described, collected, and taxonomically classified. A transection was demarcated in each one in which soils were analyzed in sites with different degrees of hydromorphism, corresponding to the inner, transition, and outer areas. In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical attributes; Hydromorphic soils; Soil classification.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100507

Genesis of textural contrasts in subsurface soil horizons in the Northern Pantanal-Brazil
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Nascimento,Alexandre Ferreira do; Furquim,Sheila Aparecida Correia; Couto,Eduardo Guimarães; Beirigo,Raphael Moreira; Oliveira Júnior,Jairo Calderari de; Camargo,Plínio Barbosa de; Vidal-Torrado,Pablo.
The Pantanal region can be characterized as a quaternary floodplain with predominant sedimentation in the form of alluvial fans. In the geomorphologic and sedimentary evolution, the avulsion process is inherent to this depositional system and its dynamics, together with surface water floods, influence soil sedimentation on this plain. The knowledge and differentiation of these two events can contribute to a better understanding of the variability of soil properties and distribution under the influence of these sedimentation processes. Therefore, this study investigated the genesis of soils in the Northern Pantanal with textural contrasts in deeper horizons and their relationship with the depositional system dynamics. We analyzed four soil profiles in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alluvial soils; Hydromorphic soils; Fluvial deposition system; Alluvial fans; Avulsion.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000500001

SOIL ORGANIC MATTER FRACTIONS IN PRESERVED AND DISTURBED WETLANDS OF THE CERRADO BIOME
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Sousa,Ricardo Fernandes de; Brasil,Eliana Paula Fernandes; Figueiredo,Cícero Célio de; Leandro,Wilson Mozena.
Veredas are humid tropical ecosystems, generally associated to hydromorphic soils and a shallow water table. The soils of these ecosystems are affected by the use of the areas around these veredas. The objective of this study was to determine soil organic matter (SOM) fractions in veredas adjacent to preserved (native savanna) and disturbed environments (agricultural areas and pastures) in the Cerrado biome. Soil samples were collected from the 0-10 and 10-20 cm layers along reference lines drawn along the relief following the upper, middle and lower positions of one of the slopes, in the direction of the draining line of the vereda. The soil analysis determined: total soil OC, total nitrogen and C:N ratio; C and N contents and C:N ratio in particulate and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydromorphic soils; Land use; Particulate fraction; Humic substances; Organic carbon.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100222

CHARACTERIZATION AND CLASSIFICATION OF FLOODPLAIN SOILS IN THE PORTO ALEGRE METROPOLITAN REGION, RS, BRAZIL
Provedor de dados: Ciência e Agrotecnologia
Autores: Silva Neto,Luís de França da; Inda,Alberto Vasconcellos; Nascimento,Paulo César Do; Giasson,Elvio; Schmitt,Catiline; Curi,Nilton.
ABSTRACTIn the Porto Alegre metropolitan region (PAMR) there are a significant proportion of floodplain soils, mainly Planosols and Gleysols, in relation to upland soils. This study aimed to evaluate the morphological, chemical and physical characteristics, and to classify floodplain soils in the PAMR. Six soil profiles were evaluated under different sedimentary lithologies and drainage classes, and samples were collected for chemical and physical analyzes. Two orders of mineral soils (Planosols and Gleysols) and one order of organic soil (Organosols) were identified. The soils were moderately deep to deep and stratified. In mineral soils hue ranged between 7.5YR and 2.5Y, with the occurrence of Bg, Btg or Cg gley horizons, while in organic soil the colors...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydromorphic soils; Quaternary sediments; Specific surface area.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000500423