Caracterização de Organossolos em ambientes de várzea do nordeste do Brasil

Cipriano-Silva, Rafael; Valladares, Gustavo Souza; Pereira, Marcos Gervásio; Anjos, Lúcia Helena Cunha dos

doi:10.1590/s0100-06832014000100003

Cited by 11 publications

(10 citation statements)

References 22 publications

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“…According to D'Amore and Lynn (2002), Bd and SOM are inversely correlated in Organosols, most likely Rev Bras Cienc Solo 2016;40:e0151317 because of the low bulk density of organic matter in relation to soil mineral fractions. The inverse correlation between Bd and C content was also shown in Brazilian organic soils by Kämpf and Schneider (1989), Valladares et al (2007) and Cipriano-Silva et al (2014). Nevertheless, information on associations among C (total and/or in humic fractions), organic matter density (OMd), minimum residue (MinR), fiber content, pyrophosphate index (PyI), and the von Post index are still limited.…”

Section: Introductionmentioning

confidence: 89%

Carbon and Nitrogen Stocks and Humic Fractions in Brazilian Organosols

Valladares

Pereira

Benites

et al. 2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:Despite limited geographic expression of Organosols in Brazil, their high carbon storage capacity and natural environmental vulnerability justifies further studies on C and N stocks in these soils and their relationship to the nature of organic matter. Evaluation of physical and chemical properties of organic soils and their ability to store C is important so as to develop sustainable management practices for their preservation. The objectives of the study were to measure the total organic carbon stock (OCst), total nitrogen stock (Nst), and humic fractions in Organosols from different environments and regions of Brazil, and to correlate the data with soil chemical (pH, P, K, Ca 2+ , Mg 2+ , Al 3+ , H+Al, CEC, V) and physical properties (soil bulk density, Bd; organic matter density, OMd; total pore space, TPS; minimum residue, MinR; and proportion of mineral matter, MM), and degree of organic matter decomposition (rubbed fiber content; pyrophosphate index, PyI; and von Post index). For that purpose, 18 Organosol profiles, in a total of 49 horizons, were sampled under different land usage and plant coverage conditions. The profiles were located in the following Brazilian states -Alagoas, Bahia, Distrito Federal, Espírito Santo, Mato Grosso do Sul, Minas Gerais, Paraná, Rio de Janeiro, Rio Grande do Sul, Santa Catarina, and São Paulo. The OCst and Nst varied significantly among horizons and profiles. The Organosols exhibited, on average, 203.59 Mg ha -1 OCst and 8.30 Mg ha -1 Nst, and the highest values were found in profiles with pasture usage. The content of the humic fraction (humin, HUM; fulvic acid, FAF; and humic acid, HAF) and C storage varied in the soil horizons and profiles according to the degree of decomposition and other factors of soil formation. The OCst, Nst, OMd and the C stocks in the humic fractions were positively correlated. The values of acidity were lower in the soils with higher contents of mineral material, and low pH values were related to a high C/N ratio. The OCst and Nst were correlated with different soil properties, the most important being the degree of soil organic matter decomposition, which was inversely correlated.

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Section: Introductionmentioning

confidence: 89%

Carbon and Nitrogen Stocks and Humic Fractions in Brazilian Organosols

Valladares

Pereira

Benites

et al. 2016

Rev. Bras. Ciênc. Solo

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“…The cassava presented the lowest SOM values in both methods and depths. In Histosols, Cipriano- Silva et al (2014) found values between 175 and 181 g kg -1 when cultivated with sugarcane and cassava; and Moura et al (2013) found values of 122 and 126 g kg -1 with cassava. These results indicate the effect of long period of cultivation and crop management, leading to intense SOM mineralization.…”

Section: Characterization Of the Sorption Complex Ph And Organic Matmentioning

confidence: 98%

“…The C stored in soil is composed of organic C (1500 Pg C) and mineral C (700 Pg C) (BATJES, 1996). However, the soil organic matter is easily decomposed through cropping (CIPRIANO-SILVA et al, 2014) thus aggravating the release of gases such as CO 2 (CERRI et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Soil attributes and c and n variation in histosols under different agricultural usages in the state of Rio de Janeiro, Brazil

Soares¹,

Zuchello²,

Anjos³

et al. 2015

Biosci. J.

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Histosols are a natural reservoir of C in the soil, and their drainage followed by other farming practices leads to subsidence and soil organic matter transformations. The objective of this study was to evaluate the influence of use and management of Histosols, by means of: characterizing chemical and physical properties, and the content of SOM and humic fractions; and quantifying C and N stocks. In addition, to obtain preliminary data on greenhouse gas emissions (CO 2 , N 2 O) in Histosol areas with different agricultural practices. Three areas were selected with similar soil and environment, two in Macaé municipality, under pasture, and with bean annual crop rotation, and the third in Santa Cruz, Rio de Janeiro city, cultivated with cassava (Manihot esculenta). The attributes evaluated were: physical-bulk density (BD), particle density (Dp), organic matter density (OMD), mineral matter (MM), mineral residue (MR), aggregate stability; and chemical-pH, exchangeable cations, soil organic matter (SOM), carbon in the humin (HUM-C), humic acid (HAF-C) and fulvic acid (FAF-C) fractions; stocks of C and N; and flux of CO 2 and N 2 O. In general, the area cultivated with cassava had the highest values for exchangeable cations, as a result of fertilizer and soil management practices. The cassava site showed the highest values of BD and Dp; total volume of pores; MM, MR and OMD and higher degree of transformation of SOM; indicating higher alteration of Histosols properties under this usage. In all sites, the C levels indicated dominance of humin fraction. The SOM and C and N stocks were highest in the pasture, indicating preservation of organic matter, with values from 115.92 to 99.35Mg ha-1 of C e 8.35 to 4.45 Mg ha-1 for N. The values of CO 2-C flux were within the range proposed by the IPCC, where the highest emission was 0.09 Mg CO 2 ha-1 day-1 in the pasture site. The values of N 2 ON flux were lower than proposed by the IPCC, with the highest value (270 g N 2 ON m-2 day-1) in the area under beans (crop rotation). In general, the multivariate analyses discriminated the sites and the pasture was the usage that least affected the Histosols properties.

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“…The lower plateaus in Northeast Brazil exhibit Cambissolos and Vertissolos derived from Jandaíra Group limestones, with pH above 7 and base saturation above 90 % (Lemos et al, 1997), as well as Organossolos (Histosols) (Silva et al, 2014). Also in Northeast Brazil, Vertissolos with high-activity clay and high contents of Ca and Mg, originating from calcareous sediments, are found in the Fernando de Noronha Archipelago, Pernambuco (Marques et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Genesis and Classification of Soils Containing Carbonates in a Toposequence of the Bambuí Group

Maranhão

Pereira

Collier

et al. 2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:The Bambuí Group, formed from siliciclastic sediments deposited on an extensive epicontinental platform at the end of the Neoproterozoic era, is characterized by limestones with fine to very fine texture. Limestone-derived soils in the southeast of Tocantins state, Brazil, are less notorious than similar soils in other regions of Brazil and their characterization could contribute to the Brazilian System for Soil Classification (SiBCS). Given that little is known of these soils, despitetheir agricultural potential, the objective of this study was to characterize their properties and the processes leading to soil of genesis, and also contribute to developing the Brazilian System of Soil Classification (SiBCS). Soils profiles were located on the summit (P1), shoulder (P2), backslope (P3), and footslope (P4) of a toposequence in the municipality of Lavandeira, Tocantins. Morphological, physical, chemical, and mineralogical properties of the profiles were determined. The soils were classified as: P1 -Chernossolo Rêndzico Lítico típico (Lithic Haplustolls); P2 -Cambissolo Háplico Ta Eutrófico léptico hipocarbonático (Lithic Haplustolls); P3 -Cambissolo Háplico Carbonático léptico (Lithic Haplustepts); and P4 -Luvissolo Háplico Órtico típico (Typic Rhodustalfs). All the profiles showed high contents of silt, calcium, and magnesium, which resulted in high pH and low exchangeable aluminum content. Base saturation and calcium carbonate equivalent contents were also high, and the horizons showed dark colors due to high organic matter content, which contained humin as the dominant fraction. Mineralogical analysis of the clay fraction indicated predominance of hydroxy-interlayered vermiculite, followed by illite, kaolinite, and quartz, whereas the sand fraction exhibited reflections characteristic of the quartz mineral. Given P4 contents of calcium carbonate equivalent above 50 g kg -1 and the relevance of this feature for agriculture, we propose the inclusion of hypocarbonate as a criterion for classification of Luvissolos Háplicos Órticos at the subgroup level.

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Caracterização de Organossolos em ambientes de várzea do nordeste do Brasil

Cited by 11 publications

References 22 publications

Carbon and Nitrogen Stocks and Humic Fractions in Brazilian Organosols

Carbon and Nitrogen Stocks and Humic Fractions in Brazilian Organosols

Soil attributes and c and n variation in histosols under different agricultural usages in the state of Rio de Janeiro, Brazil

Genesis and Classification of Soils Containing Carbonates in a Toposequence of the Bambuí Group

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