Distribution of oxidizable organic C fractions in soils under cacao agroforestry systems in Southern Bahia, Brazil

Barreto, Patrícia Anjos Bittencourt; Gama-Rodrigues, Emanuela Forestieri; Gama-Rodrigues, Antônio Carlos; Fontes, Alexandre Gomes; Polidoro, J. C.; Moço, Maria Kellen S.; Machado, Rubens E. G.; Baligar, V. C.

doi:10.1007/s10457-010-9300-4

Cited by 74 publications

(46 citation statements)

References 43 publications

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“…Loss et al (2013) observaram maior contribuição da fração F1 em área de SPD no Cerrado com o uso de maior número de culturas no sistema de manejo (girassol/milheto/soja e milho). A fração F1 pode ser considerada boa indicadora de sensibilidade da fração orgânica ao manejo do solo (Barreto et al, 2011), com diferenças visíveis mesmo em períodos mais curtos (Chan et al, 2001).…”

Section: Resultsunclassified

“…A MOS pode ser alterada em maior ou menor grau, e é um dos atributos mais sensíveis ao manejo dos solos (Barreto et al, 2008). Entretanto, em algumas situações, não é possível identificar impacto do manejo do solo somente com análise da variação dos teores de COT (Barreto et al, 2011). Neste caso, é importante que se conheça a forma de distribuição dos diferentes compartimentos que compõem a MOS, como o carbono (C) das frações húmicas (Bezerra et al, 2013) e das frações oxidáveis (Rangel et al, 2008), para que esses atributos possam ser utilizados como indicadores de qualidade do solo ao longo do tempo de cultivo (Barreto et al, 2011).…”

Section: Frações Químicas E Oxidáveis Da Matéria Orgânica Do Solo Sobunclassified

“…Além das frações húmicas, as frações oxidáveis da MOS (Chan et al, 2001) auxiliam na interpretação da dinâmica do C no solo. Elas são baseadas nos graus de oxidação do C e apresentam quatro frações (F1, F2, F3 e F4), as duas primeiras relacionadas à disponibilidade de nutrientes e à formação e estabilização de macroagregados (Barreto et al, 2011); e as duas últimas relacionadas a compostos de maior estabilidade química e peso molecular, comuns nas frações humificadas da MOS (Rangel et al, 2008) de maior tempo de residência no solo (Chan et al, 2001). Rossi et al (2011) e Loss et al (2013 verificaram que o C das frações húmicas é útil para identificar mudanças promovidas pelos sistemas de manejo em solos do Cerrado goiano.…”

Section: Frações Químicas E Oxidáveis Da Matéria Orgânica Do Solo Sobunclassified

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Frações químicas e oxidáveis da matéria orgânica do solo sob diferentes sistemas de manejo, em Latossolo Vermelho

Rosset

Lana

Pereira

et al. 2016

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a qualidade do solo a partir das frações químicas e oxidáveis da matéria orgânica (MOS) em áreas com diferentes sistemas de manejo. O trabalho foi realizado no Município de Guaíra, no Oeste do Paraná, em áreas com diferentes tempos de adoção do sistema plantio direto (SPD, 6, 14 e 22 anos), com sucessão das culturas soja (verão) e milho/trigo (inverno), além de áreas com 12 anos de SPD -no mesmo arranjo de sucessão -mais quatro anos de cultivo de braquiária (Urochloa ruziziensis) consorciada com milho (M+B) e com pastagem e mata nativa. As frações químicas de ácido fúlvico (AF), ácido húmico (AH) e humina (HUM) foram avaliadas, bem como as frações oxidáveis da MOS (F1, F2, F3 e F4), o carbono total (CT) e o estoque de carbono (C) nas frações húmicas. Os teores de CT aumentaram com o tempo de adoção do SPD, principalmente entre SPD 6 e SPD 22 . Verificou-se predomínio da fração HUM e movimentação de AH e AF na camada de 0,0-0,4 m de profundidade. As frações oxidáveis apresentaram equilíbrio na distribuição do conteúdo de C, com maiores teores nas frações mais lábeis, em superfície. O cultivo com sucessão de culturas contribui para o aumento das frações mais lábeis, mas não para o aumento das frações mais recalcitrantes do C.Termos para indexação: Urochloa ruziziensis, carbono lábil, estoque de carbono, fracionamento da matéria orgânica, qualidade do solo, substâncias húmicas. Chemical and oxidizable fractions of soil organic matter under different management systems in an OxisolAbstract -The objective of this work was to evaluate soil quality from soil organic matter (SOM) chemical and oxidizable fractions in areas with different management systems. The study was carried out in the municipality of Guaira, in the west of the state of the Paraná, Brazil, in areas with different adoption times of the no-tillage system (NT; 6, 14, and 22 years), with succession scheme of soybean (summer) and corn/wheat (winter) crops, besides areas with 12 years under NT -in the same succession scheme -plus four years of Urochloa ruziziensis intercropped with maize (M+U), and with pasture and native forest. The chemical fractions of fulvic acid (FA), humic acid (HA), and humin (HUM) were evaluated, as well as the oxidizable fractions of MOS (F1, F2, F3, and F4), total carbon (TC), and carbon storage (C) in the humic fractions. Total carbon contents increased with the increasing adoption of time of SPD, especially from NT 6 to NT 22 . Humin fraction predominance was observed, with movement of HA and FA in the 0.0-0.4 m soil depth. The oxidizable C fractions showed equilibrium in the distribution of C contents, with higher levels in the more labile fractions, at surface. The cultivation with succession of crops contributes to the increase in labile fractions, but not to the increase of the more recalcitrant fractions of C.

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Section: Resultsunclassified

Section: Frações Químicas E Oxidáveis Da Matéria Orgânica Do Solo Sobunclassified

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Frações químicas e oxidáveis da matéria orgânica do solo sob diferentes sistemas de manejo, em Latossolo Vermelho

Rosset

Lana

Pereira

et al. 2016

Pesq. agropec. bras.

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“…Thus, complementary analyses such as chemical SOM partitioning (Oliveira-Júnior et al, 2008;Benites et al, 2010;Loss et al, 2010;Vergnoux et al, 2011;Nadi et al, 2012) and oxidizable carbon determination (Maia et al, 2007;Rangel et al, 2008;Loss et al, 2009;Kolar et al, 2009;Barreto et al, 2011;Loss et al, 2011b;Culman et al, 2012) are valuable tools not only in assessing soil changes due to land use, but also to quantify carbon levels in different soil fractions.…”

mentioning

confidence: 99%

Oxidizable carbon and humic substances in rotation systems with brachiaria/livestock and pearl millet/no livestock in the Brazilian Cerrado

Loss

Pereira

Perín³

et al. 2013

Span. j. agric. res.

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The crop-livestock integration system significantly increases the carbon content in chemical fractions of soil organic matter (SOM). This study aimed to evaluate chemical indicators of SOM attributes for sites under brachiaria/livestock and pearl millet/no livestock in Goias, Brazil. A third area covered with natural Cerrado vegetation (Cerradão) served as reference. Soil was randomly sampled at 0-5, 5-10, 10-20 and 20-40 cm. Total organic carbon stocks (TOC), oxidizable carbon fractions (OCF) (F1>F2>F3>F4), carbon content in the humin (C-HUM), humic acid (C-HAF) and fulvic acid (C-FAF) fractions were evaluated. F1/F4, F1+F2/F3+F4, C-HAF/C-FAF and (C-HAF+C-FAF)/C-HUM indices were calculated, as well as stocks chemical SOM fractions. Brachiaria/livestock produced greater TOC stocks than pearl millet/no livestock (0-5, 5-10 and 10-20 cm). In terms of OCF, brachiaria/livestock generally exhibited higher levels in F1, F2, F4 and F1/F4 than pearl millet/no livestock. C-HUM (0-10 cm) and C-HAF (0-20 cm) stocks were larger in brachiaria/livestock than pearl millet/no livestock. Compared to the Cerradão, brachiaria/livestock locations displayed higher values for TOC (5-10 and 10-20 cm), C-HAF and C-HAF/C-FAF (5-10 cm) stocks. TOC, C-HAF stock and OCF show that land management with brachiaria/livestock was more efficient in increasing SOM than pearl millet/no livestock. Moreover, when compared with pearl millet/no livestock, brachiaria/livestock provided a more balanced distribution of very labile (F1) and recalcitrant (F4) carbon throughout soil layers, greater SOM humification. Brachiaria/livestock leads to higher values of F1 and F4 in depth when compared to pearl millet/livestock and provides a more homogeneous distribution of C-FAF and C-HAF in depth compared to Cerradão.

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“…Barreto et al (2011), studying cacao cultivation in an Atlantic Forest and a pasture system in Brachiaria, verified that the highest percentage of organic C was observed in the humin fraction. Likewise, in our study the highest organic C contents in this fraction were in the pasture area at 0-0.10 m depth, where the greatest contribution of the fasciculate root system of the grasses occurs.…”

Section: +mentioning

confidence: 79%

Chemical and physical fractions of soil organic matter under various management regimes in Roraima, Brazil

Guardiola

Júnior

Silva

et al. 2017

SCA

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The crop-livestock integration (CLI) and crop-livestock-forest integration (CLFI) management systems, have been shown to be viable approaches for increasing carbon sequestration in soils, resulting in the improvement of physical and chemical soil attributes. The objective of this study was to evaluate the chemical attributes and organic matter in soils under Natural Forest (NF) converted to different uses and managed differently: rotational pasture area (PAST), crop-livestock integration (CLI), and croplivestock-forest integration (CLIF). The research was conducted at the São Paulo farm, in Iracema, located in the south-central region of the state of Roraima, Brazil. The studied soil type was classified as Ultisol. Soil samples were taken by opening ditches and examining layers at 0.1-m depth intervals from surface to 0.60-m depth. Total organic carbon (TOC), chemical and granulometric fractionation of soil organic matter (SOM), oxidizable fractions, and light organic matter in water were analyzed. Our results showed low levels of the analyzed chemical elements, a characteristic of a soil with low natural fertility. This matches conditions inherent in source material, weathered by high rainfall, a warm and humid climate, and flat topographic relief. In the 0-0.1 m layer, the PAST and CLI systems had the highest TOC contents relative to the other systems studied. At other depths, there were no statistical differences among TOC levels. The highest concentration of C in the particulate fraction (POC) was noted in the surface layer in all management systems. The pasture system had the highest concentration POC in the top 0.10 m. Our results also showed that the upper 0.10 m of soil in NF contained the lowest content of organic carbon associated with mineral (MOC) relative to the managed agrosystems. In addition, humin provided the largest contribution to SOM in all evaluated management systems. The crop-livestock integration (CLI) and crop-livestock integration forest (CLIF) systems, emerged as a strong alternative to carbon incorporation and subsequently the improvement of physical and chemical soil attributes. The objective of this work to evaluate the chemical attributes and organic matter in soils under Natural forest (NF) converted into different use and management systems: pasture (PAST), croplivestock Integration (CLI) and crop-livestock Integration forest (CLIF). The research was conducted at São Paulo farm in Iracema, located in the Center-South region of the State of Roraima, Brazil. The soil studied was classified as Argissolo Amarelo Distrófico. The samples were taken by the opening of trenches in layers of 0-0.10, 0.10-0.20, 0.20-0.40, and 0.40-0.60 m depth. Total organic carbon (TOC), chemical and granulometric fractionation of soil organic matter (SOM), oxidizable fractions and organic matter in water were analyzed. The results showed low levels of the analyzed chemical elements which characterizes soils with low natural fertility, which matches the conditions of the source material, high rain...

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Distribution of oxidizable organic C fractions in soils under cacao agroforestry systems in Southern Bahia, Brazil

Cited by 74 publications

References 43 publications

Frações químicas e oxidáveis da matéria orgânica do solo sob diferentes sistemas de manejo, em Latossolo Vermelho

Frações químicas e oxidáveis da matéria orgânica do solo sob diferentes sistemas de manejo, em Latossolo Vermelho

Oxidizable carbon and humic substances in rotation systems with brachiaria/livestock and pearl millet/no livestock in the Brazilian Cerrado

Chemical and physical fractions of soil organic matter under various management regimes in Roraima, Brazil

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