Atributos químicos e área superficial específica em Latossolo subtropical de altitude sob usos e manejos distintos

Tomasi, Cristiano Albino; Inda, Alberto Vasconcellos; Dick, Deborah Pinheiro; Bissani, Carlos Alberto; Fink, Jessé Rodrigo

doi:10.1590/s0103-84782012005000095

Cited by 10 publications

(9 citation statements)

References 20 publications

(25 reference statements)

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“…The specific surface area (SSA) has an expressive range, varying from 3.9 to 90.6 m 2 g -1 in the mineral soils and reaching values close to 140 m 2 g -1 in the Organosol (Table 3). This variation in SSA values, estimated by water adsorption, was positively related to the organic carbon content, as found in other studies (Tomasi et al, 2012;Fink et al, 2014), and inverse with the silt content (Table 4). When considering the profiles individually, it was observed that the profiles P1, P4 and P5, greater SSA values occurred in horizons with higher contents of clay and pedogenic iron oxide (Fed).…”

Section: Morphological and Physical Characterizationsupporting

confidence: 86%

Characterization and Classification of Floodplain Soils in the Porto Alegre Metropolitan Region, Rs, Brazil

et al. 2015

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In 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 were neutral. Sand and silt were the predominant particle sizes according to the origin sedimentary deposits. The organic carbon content was negatively related to soil density and positively related to soil specific surface area and with soil cation exchange capacity. Soil chemical characterization showed expressive variation in bases, aluminum and sodium saturation. Ki index and Fe (CBD) /Fe (H2SO4) ratio indicated a low soil weathering degree. The different sedimentary lithologies and the soil hydromorphism degree were the main factors related to differences in morphological, physical and chemical characteristics of soils in the PAMR.Index terms: Hydromorphic soils; quaternary sediments; specific surface area. RESUMONa região metropolitana de Porto Alegre (PAMR) é expressiva a proporção de solos de várzea em relação aos solos de terras altas, com predomínio de Planossolos e Gleissolos. Este estudo objetivou caracterizar a morfologia, a física e a química, e classificar taxonomicamente solos em posições de várzea na PAMR. Foram abertas seis trincheiras em relevo plano, sob diferentes litologias sedimentares e classes de drenagem,onde foram realizadas a descrição morfológica dos perfis de solos e a coleta de amostras para as análises físicas e químicas.Foram identificadas duas ordens de solos minerais (Gleissolo e Planossolo) e uma orgânica (Organossolo). Os solos foram moderadamente profundos a profundos e estratificados. Nos solos minerais a matiz variou entre 7,5YR e 2,5Y, com ocorrência de horizontes gleizados Bg, Btg ou Cg, enquanto no Organossolo as cores foram neutras. A granulometria dos solos, com predominância das frações areia e silte, variou conforme os depósitos sedimentares de origem. A expressiva amplitude dos teores de C orgânico mostrou relação negativa coma densidade do solo, e positiva com a área superficial específica e a capacidade de troca de cátions. Os atributos químicos também se mostraram discriminantes entre os solos avaliados, com ocorrência de distrofismo e eutrofismo, variações amplas dos teores de Al 3+ trocável e ocorrência de caráter solódico. Nos solos minerais o índice Ki e a relação Fe (CBD) /Fe (H2SO4) indicaram um grau incipiente de desenvolvimento dos solos. O material de origem e o grau de hidromorfismo foram os principa...

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Section: Morphological and Physical Characterizationsupporting

confidence: 86%

Characterization and Classification of Floodplain Soils in the Porto Alegre Metropolitan Region, Rs, Brazil

et al. 2015

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“…Compared with NGr, animal waste application did not alter SSA in the 0.0-2.5 cm layer, which was reduced by maize cultivation with no poultry litter application (NTM). The SSA, estimated by water adsorption, proved to be sensitive to variations in organic matter concentration influenced by soil use and management, with a direct relationship with the levels of total organic carbon (TOC) (Table 3), as observed in previous studies (Almeida et al, 2003;Tomasi et al, 2012). The different soil uses and managements did not affect the pH, Al, potential acidity (H+Al), Al saturation (m), and base saturation (V).…”

Section: Physical and Chemical Soil Propertiessupporting

confidence: 71%

Chemical and mineralogical changes in a Brazilian Rhodic Paleudult under different land use and managements

Fink

Inda

Almeida

et al. 2014

Rev. Bras. Ciênc. Solo

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Changes in land use and management can affect the dynamic equilibrium of soil systems and induce chemical and mineralogical alterations. This study was based on two long-term experiments (10 and 27 years) to evaluate soil used for no-tillage maize cultivation, with and without poultry litter application (NTPL and NTM), and with grazed native pasture fertilized with cattle droppings (GrP), on the chemical and mineralogical characteristics of a Rhodic Paleudult in Southern Brazil, in comparison with the same soil under native grassland (NGr). In the four treatments, soil was sampled from the 0.0-2.5 and 2.5-5.0 cm layers. In the air-dried fine soil (ADFS) fraction (∅ < 2 mm), chemical characteristics of solid and liquid phases and the specific surface area (SSA) were evaluated. The clay fraction (∅ < 0.002 mm) in the 0.0-2.5 cm layer was analyzed by X-ray diffraction (XRD) after treatments for identification and characterization of 2:1 clay minerals. Animal waste application increased the total organic C concentration (COT) and specific surface area (SSA) in the 0.0-2.5 cm layer. In comparison to NGr, poultry litter application (NTPL) increased the concentrations of Ca and CECpH7, while cattle droppings (GrP) increased the P and K concentrations. In the soil solution, the concentration of dissolved organic C was positively related with COT levels. With regard to NGr, the soil use with crops (NTM and NTPL) had practically no effect on the chemical elements in solution. On the other hand, the concentrations of most chemical elements in solution were higher in GrP, especially of Fe, Al and Si. The Fe and Al concentrations in the soil iron oxides were lower, indicating reductive/complexive dissolution of crystalline forms. The X-ray diffraction (XRD) patterns of clay in the GrP environment showed a decrease in intensity and reflection area of the 2:1 clay minerals. This fact, along with the intensified Al and Si activity in soil solution indicate dissolution of clay minerals in soil under cattle-grazed pasture fertilized with animal droppings.

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“…As condições geradas nessa floresta podem afetar o equilíbrio do carbono e nutrientes no solo e influenciar a resiliência desses ambientes (SIMBERLOFF et al, 2010). Esses efeitos negativos podem variar em função do tipo de solo, clima, vegetação, manejo e tempo de substituição dessas áreas, implicando em impacto maior nos ecossistemas nativos mais frágeis e/ou de maior relevância ecológica, conforme verificado em ambientes naturais do Sul do Brasil (WIESMEIER et al, 2009;DICK et al, 2011;TOMASI;DICK, 2012).…”

Section: Introductionunclassified

Atributos químicos do solo em plantios florestais em substituição à vegetação nativa em campos de altitude

Klug¹,

Mafra

Friederichs

et al. 2020

Ciênc. Florest.

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Os plantios de espécies florestais exóticas vêm aumentando em áreas cobertas por vegetação nativa na região nordeste do Rio Grande do Sul, o que pode alterar as dinâmicas dos nutrientes no solo. Dessa maneira, o objetivo deste estudo foi avaliar os efeitos da mudança de uso da terra sobre pH e teores de carbono orgânico total (COT), Al3+, Ca2+, Mg2+ e K+ em Cambissolo Húmico, em plantios realizados em área de campo nativo. As áreas analisadas foram pinus plantado em 1963 (P) e eucalipto em 1991 (E), comparativamente a áreas adjacentes remanescentes: de campo nativo em regeneração natural a partir de 1990 (RN), mata nativa (MN) e campo nativo (CN). As amostras de solo foram coletadas nas profundidades de 0-5, 5-10 e 10-20 cm, em oito pontos para cada área avaliada, com cálculo de médias e intervalos de confiança (95%). Em geral, CN e MN apresentaram os maiores valores de COT. O plantio “P” apresentou em relação ao CN menores teores de COT, Ca e K na camada 0-10 cm, enquanto o plantio “E” apresentou menores teores de COT em relação ao CN, indicando efeitos negativos da floresta plantada em relação à vegetação natural campestre quanto à ciclagem de carbono e nutrientes. A área RN apresentou valores desses atributos similares aos do CN e MN. Avaliações em longo prazo são importantes para verificar influências do cultivo florestal sobre atributos do solo e identificar a sustentabilidade das formas de uso do solo.

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Atributos químicos e área superficial específica em Latossolo subtropical de altitude sob usos e manejos distintos

Cited by 10 publications

References 20 publications

Characterization and Classification of Floodplain Soils in the Porto Alegre Metropolitan Region, Rs, Brazil

Characterization and Classification of Floodplain Soils in the Porto Alegre Metropolitan Region, Rs, Brazil

Chemical and mineralogical changes in a Brazilian Rhodic Paleudult under different land use and managements

Atributos químicos do solo em plantios florestais em substituição à vegetação nativa em campos de altitude

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