Atributos químicos, físico-hídricos e mineralogia da fração argila em solos do Baixo Amazonas: Serra de Parintins

Marquesi, Jean Dalmo de Oliveira; Teixeira, W. G.; Reis, Ana Maria; Cruz, Orlando F.; Batista, Salomão Marialva; Afonso, M. A.

doi:10.1590/s0044-59672010000100001

Cited by 15 publications

(14 citation statements)

References 16 publications

(13 reference statements)

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“…This may be related to their soil type (Table 1). Martins et al (2006), Marques et al (2010), and Campos et al (2010Campos et al ( , 2011 observed similar results in their studies.…”

Section: Resultssupporting

confidence: 74%

Use of Scaled Semivariograms in the Planning Sample of Soil Physical Properties in Southern Amazonas, Brazil

Aquino¹,

Campos

Marques³

et al. 2015

Rev. Bras. Ciênc. Solo

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There is a great lack of information from soil surveys in the southern part of the State of Amazonas, Brazil. The use of tools such as geostatistics may improve environmental planning, use and management. In this study, we aimed to use scaled semivariograms in sample design of soil physical properties of some environments in Amazonas. We selected five areas located in the south of the state of Amazonas, Brazil, with varied soil uses, such as forest, archaeological dark earth (ADE), pasture, sugarcane cropping, and agroforestry. Regular mesh grids were set up in these areas with 64 sample points spaced at 10 m from each other. At these points, we determined the particle size composition, soil resistance to penetration, moisture, soil bulk density and particle density, macroporosity, microporosity, total porosity, and aggregate stability in water at a depth of 0.00-0.20 m. Descriptive and geostatistical analyses were performed. The sample density requirements were lower in the pasture area but higher in the forest. We concluded that managed-environments had differences in their soil physical properties compared to the natural forest; notably, the soil in the ADE environment is physically improved in relation to the others. The physical properties evaluated showed a structure of spatial dependence with a slight variability of the forest compared to the others. The use of the range parameter of the semivariogram analysis proved to be effective in determining an ideal sample density.

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“…This may be related to their soil type (Table 1). Martins et al (2006), Marques et al (2010), and Campos et al (2010Campos et al ( , 2011 observed similar results in their studies.…”

Section: Resultssupporting

confidence: 74%

Use of Scaled Semivariograms in the Planning Sample of Soil Physical Properties in Southern Amazonas, Brazil

Aquino¹,

Campos

Marques³

et al. 2015

Rev. Bras. Ciênc. Solo

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“…Os sistemas MA, T5 e PA foram os que mais armazenaram Ca e NT. Uma das prováveis causas, que podem ter contribuído para o aumento do armazenamento de Ca, é a decomposição do sistema radicular da mata primitiva, que promoveu a liberação desse nutriente, ou ainda, no caso dos sistemas de uso, os altos teores de cálcio podem ser explicados pela queima da mata na implantação de outros sistemas, sendo atribuído à concentração desse elemento nas cinzas (Araújo et al 2004 (Marques et al 2010). Outra possível causa do baixo estoque de K, pode ser devido à interação eletrostática entre Ca, Mg e K (Swarowsky et al 2006).…”

Section: Resultsunclassified

Estoque de nutrientes sob diferentes sistemas de uso do solo de Colorado do Oeste-RO

et al. 2013

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A substituição da floresta por outro tipo de uso do solo pode levar a perdas significativas na matéria orgânica do solo, alterando sua dinâmica e como consequência alterando as entradas e saídas de nutrientes do sistema. Neste trabalho o objetivo foi avaliar o estoque de nutrientes em diferentes sistemas de uso de solo em Colorado do Oeste-RO. Os sistemas avaliados foram o agroflorestal (teca e cacau), florestal (teca com cinco anos), teca com oito anos, agrossilvopastoril (teca, cacau e pasto) e pastagem tendo a mata nativa como referência. Em cada sistema foram abertas três minitrincheiras, nas quais foram coletadas amostras deformadas e indeformadas nas profundidades de 0 a 5, 5 a 10, 10 a 20 e 20 a 30 cm. Nessas amostras foram determinados os nutrientes: N, P, K, Ca e Mg, a matéria orgânica, a densidade do solo e os teores de argila. The replacement of forest by other land use can lead to significant losses in soil organic matter, changing its dynamic and the nutrients inputs and outputs of the system. The objective of this study was to assess nutrient stocks under different land use systems in Colorado do Oeste-RO. The agroforestry (teak, and cocoa), forestry (teak with five years), teak for eight years, farming areas (teak, cocoa and pasture) and pasture were the systems evaluated and the native forest was taken as reference. In each system three small trenches were dug, in which deformed and undeformed soil samples, at depths of 0 to 5, 5 to 10, 10 to 20 and 20 to 30 cm were taken. In these samples the nutrients N, P, K, Ca and Mg, organic matter, bulk density and clay content were determined. A completely randomized design with split plots and, three replications in each system was adopted. Differences were observed in soil nutrient stocks among the usage systems and with depth. The concentration of nutrients was influenced by the system. Ca was the nutrient most stored (2912.86 to 5188.48 kg ha -1 ) in all systems and K was the least(17.33 to 46.22 kg ha -1 ). The system of teak five years is the system which is closer to the forest, for the storage of nutrients.

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“…HUGAR;SORAGANVI, 2014). Although the carbon content decrease in depth, physical attributes of Amazon soils such as clay content, soil bulk density, amount of macropores and micropores may exert the protection of the carbon contained in the soil (MARQUES et al, 2010(MARQUES et al, , 2012 leading to increases in carbon stocks in depth.…”

Section: Discussionmentioning

confidence: 99%

Soil Organic Carbon, Carbon Stock and Their Relationships to Physical Attributes Under Forest Soils in Central Amazonia

et al. 2016

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-The soil carbon under Amazonian forests has an important roles in global changing, making information on the soil content and depths of these stocks are considerable interest in efforts to quantify soil carbon emissions to the atmosphere.This study quantified the content and soil organic carbon stock under primary forest up to 2 m depth, at different topographic positions, at Cuieiras Biological Reserve, Manaus/ ZF2, km 34, in the Central Amazon, evaluating the soil attributes that may influence the permanence of soil carbon. Soil samples were collected along a transect of 850 m on topographic gradient Oxisol (plateau), Ultisol (slope) and Spodosol (valley). The stocks of soil carbon were obtained by multiplying the carbon content, soil bulk density and trickiness of soil layers. The watershed was delimited by using STRM and IKONOS images and the carbon contend obtained in the transects was extrapolated as a way to evaluate the potential for carbon stocks in an area of 2678.68 ha. The total SOC was greater in Oxisol followed by Spodosol and Ultisol. It was found direct correlations between the SOC and soil physical attributes. Among the clay soils (Oxisol and Ultisol), the largest stocks of carbon were observed in Oxisol at both the transect (90 to 175.5 Mg C ha -1 ) as the level of watershed (100.2 to 195.2 Mg C ha -1 ). The carbon stocks under sandy soil (Spodosol) was greater to clay soils along the transect (160-241 Mg C ha -1 ) and near them in the Watershed (96.90 to 146.01 Mg C ha -1 ).Keywords: Carbon; Soil physical properties; Amazonian forest. CARBONO ORGÂNICO DO SOLO, ESTOQUE DE CARBONO E SUA RELAÇÃO COM ATRIBUTOS FÍSICOS SOB SOLOS FLORESTAIS NA AMAZÔNIA CENTRALRESUMO -O carbono do solo sob floresta amazônica tem um papel importante na mudança global, tornando as informações sobre os teores de carbono e profundidades desses estoques são de grande interesse no esforço de quantificar as emissoes de carbono do solo para a atmosfera. Este estudo quantificou os teores e estoques de carbono orgânico do solo sob floresta primária até 2 m de profundidade, em diferentes posições topográficas, na Reserva Biológica do Cueiras, Manaus/ZF2, km34, na Amazônia Central; avaliando-se os atributos do solo que podem influenciar na permanência do carbono no solo. Coletaram-se amostras de solos ao longo de um transecto de 850 m num gradiente topográfico Latossolo (platô), Argissolo (vertente) e Espodossolo (baixio). Os estoques de carbono do solo foram obtidos multiplicando a concentração de carbono pela densidade do solo e espessura de camadas do solo. Delimitou-se uma microbacia hidrográfica através de imagens STRM e IKONOS extrapolando-se os teores de carbono obtidos no transecto como forma de avaliar o potencial de estocagem de carbono em uma área de 2.678,68 ha. O total de COS foi maior no Latossolo seguido

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Atributos químicos, físico-hídricos e mineralogia da fração argila em solos do Baixo Amazonas: Serra de Parintins

Cited by 15 publications

References 16 publications

Use of Scaled Semivariograms in the Planning Sample of Soil Physical Properties in Southern Amazonas, Brazil

Use of Scaled Semivariograms in the Planning Sample of Soil Physical Properties in Southern Amazonas, Brazil

Estoque de nutrientes sob diferentes sistemas de uso do solo de Colorado do Oeste-RO

Soil Organic Carbon, Carbon Stock and Their Relationships to Physical Attributes Under Forest Soils in Central Amazonia

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