Characterization of Headwaters Peats of the Rio Araçuaí, Minas Gerais State, Brazil

Bispo, Diêgo Faustolo Alves; Silva, Alexandre Christófaro; Christófaro, Cristiano; Silva, Max Leandro Naves; Barbosa, Maurício Soares; Silva, Bárbara Pereira Christófaro; Barral, U. M.

doi:10.1590/01000683rbcs20140337

Cited by 19 publications

(14 citation statements)

References 26 publications

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“…However, Histosols can be formed (Simas et al, 2005;Benites et al, 2007;Chimner and Karberg, 2008;Scheer et al, 2011) by favoring the contribution of organic matter in detriment to its transformation, thus leading to its accumulation (Silva et al, 2013;Weissert and Disney, 2013;Bispo et al, 2015). In addition, they form as a result of a decrease in decomposition rates at low temperatures, while a constant supply of organic matter is maintained (Benites et al, 2007;Silva et al, 2009;Weissert and Disney, 2013;Benavides and Vitt, 2014;Cooper et al, 2015;Hribljan et al, 2016;).…”

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confidence: 99%

Histosols in an Upper Montane Environment in the Itatiaia Plateau

Soares

Anjos

Pereira

et al. 2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:Highland environments favor accumulation and preservation of soil organic matter (SOM) due to low temperatures, leading to the formation of Histosols. The Itatiaia National Park (INP), Rio de Janeiro, Brazil, offers conditions for preservation of SOM deposited over time, which has led to the formation of these soils. The objective of this study was to characterize Histosols in this environment, with the premise that it may provide evidence of changes in vegetation. Organossolos (Histosols) were sampled, characterized, described, and analyzed for their properties, stable isotopes of 12 C and 13 C, 14 N and 15 N, and dating of organic matter through 14 C. The soils were classified in the Brazilian Soil Classification System as Organossolo Háplico Hêmico típico -RJ-01 (Haplohemists) and Organossolo Fólico Sáprico cambissólico -RJ-02 (Udifolists). The morphological properties, degree of transformation, and chemical fractioning of SOM were consistent with hemic and sapric materials. The δ 13 C and δ 15 N isotopic analyses showed a difference in the contribution of plant materials. In RJ-01, there was previous influence of algae, due to poor drainage, and depletion of δ 13 C, suggesting a mix of C 3 and C 4 plants. RJ-02 showed influence of C 3 type plants. The 14 C dating for RJ-01 was 3280±80 years, and for RJ-02, 2005±5 years (modern age).

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Histosols in an Upper Montane Environment in the Itatiaia Plateau

Soares

Anjos

Pereira

et al. 2016

Rev. Bras. Ciênc. Solo

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“…The formation of peat deposits in high-mountain environments, where the climate is humid and cold during most of the year, as in the INP, can occur even in non-hydromorphic conditions through litter accumulation. Several studies show that OM accumulation under well-drained conditions occurs due to reduction in the metabolic activity of microorganisms, disfavoring decomposition of the plant material and leading to accumulation of material and thickening of the organic layer (Zech et al, 1997;Benites et al, 2007;Silva et al, 2013;Bispo et al, 2015;Soares et al, 2016). However, the subprocesses and reactions involved in the formation of the Organossolos Fólicos (Typic Udifolists) are still not well understood.…”

Section: Profile Characterizationmentioning

confidence: 99%

Paleoenvironmental Characterization of a High-Mountain Environment in the Atlantic Forest in Southeastern Brazil

Neto

Santos

Pereira

et al. 2018

Rev. Bras. Ciênc. Solo

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Records of changes in the phytosociological structure of vegetation can be observed more clearly in soils that have more significant accumulation of organic matter, like those occurring in high-mountain environments. The aim of this study was to characterize soils formed in high-mountain environments in the Itatiaia National Park (INP), state of Rio de Janeiro, southeastern Brazil, and to discuss the potential of preserved phytoliths as markers of vegetative history and environmental factors. Four profiles were selected, which were morphologically described and evaluated for their physical and chemical properties. For phytolith analysis and high-resolution determination of the stable carbon isotopes, samples were collected at 0.10 m intervals. The profiles showed highly similar morphological characteristics, with peat deposits and colluvial sediments as source material, produced in the highest parts of the landscape. High-mountain soils in the INP have properties related to high contents of organic matter, like high acidity, low base saturation, and high CEC values due to high H + contents. The soils are formed by the addition of plant residues, which accumulate due to the cold and humid climate during most of the year in these environments. The phytolith assemblage had a high frequency of morphotypes characteristic of temperate, cold, and high elevation intertropical regions, especially of Pooideae plants. The phytolith indexes indicated open vegetation environments with a predominance of C 3 grasses, suggesting cold climate conditions, and corroborating the δ 13 C isotopic values. The results of phytolith analysis of the profiles reflected characteristics related to soil genesis. Organism is the main soil formation factor, conditioned by the factors relief (elevation) and climate, which resulted in low temperatures and lead organic matter accumulation.

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“…T urfeiras são produtos da lenta decomposição de vegetais em ambientes saturados com água. São ecossistemas particulares por acumularem grandes volumes de água e matéria orgânica e atuam como registros cronológicos de mudanças paleoambientais nas escalas local, regional e global (SILVA et al, 2009a;SCHELLEKENS et al, 2014;BISPO et al, 2015;CAMPOS et al, 2016). Além disso, esses ecossistemas são sensíveis às alterações climáticas e vulneráveis a perturbações antrópicas.…”

Section: Introductionunclassified

“…As turfeiras estudadas neste trabalho estão fora de Unidades de Conservação (UCs), portanto sofrem intensa ação antrópica (pastoreio, fogo, agricultura, dentre outras atividades) e estão se degradando rapidamente (BISPO et al, 2015). Uma análise espacial e temporal, por meio do geoprocessamento, possibilita identificar a dinâmica das atividades antrópicas no entorno destes ecossistemas (FONSECA et al, 2014;2016a).…”

Section: Introductionunclassified

“…As turfeiras da Serra do Espinhaço Meridional prestam relevantes serviços ambientais: armazenam a água das chuvas e matem a vazão dos cursos d'água nos períodos secos; estocam carbono e são arquivos cronológicos de mudanças paleoambientais (SILVA et al, 2009a;SCHELLEKENS et al, 2014;BISPO et al, 2015;CAM-POS et al, 2016)0. Há um Projeto de Lei tramitando na Assembléia Legislativa de Minas Gerais (PL 3062/2015) que determina que um raio de 500 metros do eixo das turfeiras seja área de preservação permanente.…”

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Identificação de usos da terra no entorno de turfeiras em Datas/Minas Gerais

Fonseca

Silva

Senna

2018

REGEP

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O objetivo deste trabalho foi mapear de forma cronológica (1964 – 2014), áreas do entorno de três turfeiras situadas em Datas/MG, visando identificar pressão antrópica, oriunda do uso e ocupação da terra nessas áreas. Para tanto foram utilizadas técnicas de geoprocessamento, tais como georreferenciamento, mosaicagem, classificação supervisionada (MaxVer) e vetorização. Utilizou-se produtos do sensoriamento remoto como fotografias aéreas e imagens dos satélites Landsat (TM/5 e OLI/8) e RapidEye. Os resultados possibilitaram a identificação dos tipos de uso da terra (eucalipto e outras culturas) no entorno das turfeiras situadas no município estudado. A área ocupada com eucaliptocultura, que era inexistente em 1964, ocupou 45,56 ha em 1995 e avançou para 146,16 ha em 2014 (6,14% da área analisada). Outras culturas (morango e milho), também não cultivadas na área em 1964, avançaram para 292,58 ha, em 2014 (12,29% da área estudada). O avanço da agricultura em torno de turfeiras do município de Datas/MG comprova o aumento da pressão antrópica sobre estes ecossistemas, que prestam relevantes serviços ambientais.

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Characterization of Headwaters Peats of the Rio Araçuaí, Minas Gerais State, Brazil

Abstract: ABSTRACT

Cited by 19 publications

References 26 publications

Histosols in an Upper Montane Environment in the Itatiaia Plateau

Histosols in an Upper Montane Environment in the Itatiaia Plateau

Paleoenvironmental Characterization of a High-Mountain Environment in the Atlantic Forest in Southeastern Brazil

Identificação de usos da terra no entorno de turfeiras em Datas/Minas Gerais

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