Carbono orgânico nas frações granulométricas e substâncias húmicas de um Latossolo Vermelho Amarelo distrófico - LVAd sob diferentes agrossistemas

Martins, Eucarlos de Lima; Coringa, Josias do Espírito Santo; Weber, Oscarlina Lúcia dos Santos

doi:10.1590/s0044-59672009000300021

Cited by 19 publications

(20 citation statements)

References 10 publications

(8 reference statements)

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“…This indicates that most of the C consists of the most recalcitrant forms, as already reported in literature (Trumbore, 2000;Martins et al, 2009).…”

Section: In Sites Of Pastures Under Different Managements the Highessupporting

confidence: 84%

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Can Soil Organic Carbon Pools Indicate the Degradation Levels of Pastures in the Atlantic Forest Biome?

Donagemma

Andrade²,

Passos³

et al. 2013

JAS

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In Brazil, a large part of the Atlantic Forest was deforested in pastures, which were developed on the basis of natural fertility and organic matter content of the new deforested soil. However, as time went by the organic matter content in these areas have been decreasing causing soil degradation. The objective of this study was to evaluate the organic matter as a quality indicator of Ultisols in different levels of pasture degradation in the region of Governador Valadares-MG. Four sites of pastures were chosen at different levels of degradation, observed visually, two capoeiras in different stages of natural recovery and forest site (reference). Soil samples were collected at three depths (0.00-0.05, 0.05-0.10 and 10-0.20 m) in two seasons of the year (rainy and dry seasons) in the middle third of the landform with three replicates. The following attributes were determined: soil organic C, free light fraction, particulate organic matter, particulate organic C, mineral-associated organic C and dissolved organic matter. The experimental results showed that the soil organic matter appeared efficient in discriminating soil quality between degraded forest/pasture, as well as between degraded capoeira/pasture. But, it was not sensitive to discriminate within levels of degraded pastures. Among the organic matter pools studied, the most sensitive soil quality indicators were: particulate organic matter and dissolved organic matter, in the following degraded order verified from these indicators: forest < capoeira 1 = capoeira 2 < pastures (1, 2, 3 and 4).

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“…This indicates that most of the C consists of the most recalcitrant forms, as already reported in literature (Trumbore, 2000;Martins et al, 2009).…”

Section: In Sites Of Pastures Under Different Managements the Highessupporting

confidence: 84%

“…By contrast, some authors found that soils under pasture can show higher contents of SOC when compared to forest sites, which can be due to the management of pastures Oliveira et al, 2004;Martins et al, 2009). …”

Section: Resultsmentioning

confidence: 93%

Can Soil Organic Carbon Pools Indicate the Degradation Levels of Pastures in the Atlantic Forest Biome?

Donagemma

Andrade²,

Passos³

et al. 2013

JAS

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“…As relações C-FAH/C-FAF foram superiores a 1 para a maioria dos horizontes, denotando o predomí-nio dos ácidos húmicos nos diferentes tipos de solo sob Floresta Estacional Decidual. Essa relação pode indicar maior conversão do carbono orgânico insolú-vel presente no solo em frações solúveis (MARTINS et al, 2009), entendendo-se que esta conversão é influenciada por outros fatores edáficos, como o pH do solo e o teor de argila, por exemplos. Em geral, os solos mais arenosos apresentam valores superiores para a relação, o que significa a perda seletiva da fração mais solúvel (FAF).…”

Section: Resultsunclassified

Frações Da Matéria Orgânica Em Solos Sob Formações Deciduais No Norte De Minas Gerais

Martins

Costa²,

Schaefer³

et al. 2015

Rev. Caatinga

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RESUMO -A dinâmica da matéria orgânica influencia os principais processos químicos, físicos e biológicos nos solos e determina muitas vezes seu comportamento químico e sua fertilidade. É fundamental a quantificação das frações que compõem a matéria orgânica para a compreensão dos processos pedogenéticos que refletem ou induzem as propriedades dos solos. O objetivo do estudo foi avaliar o comportamento da matéria orgâ-nica do solo de diferentes perfis de solos sob formações deciduais, por meio do fracionamento químico da matéria orgânica e obtenção de suas diferentes frações oxidáveis. Dez perfis de solo foram descritos e coletados em áreas de formações deciduais em municípios de Minas Gerais e Bahia. Foram realizadas análises químicas e físicas em cada horizonte. Para as frações da matéria orgânica foi realizado o desmembramento de substâncias húmicas e posterior determinação de carbono de cada fração, quais sejam, humina (C-HUM), ácido fúlvico (C-FAF) e ácido húmico (C-FAH), e calculadas suas relações e o percentual de cada fração em relação a C orgâni-co total (COT), %FAF, %FAH, %HUM e %EA, além das frações de C oxidável em cada horizonte avaliado. As substâncias húmicas que compõem a matéria orgânica dos solos de perfis de Florestas Estacionais Deciduais mostraram que este compartimento da MOS apresentou predomínio da fração humina, seguido dos ácidos hú-micos e com menor teor de C, e os ácidos fúlvicos para a maioria dos solos. Já as diferentes frações de C oxidá-vel puderam apontar frações mais lábeis associadas aos horizontes superficiais e mais recalcitrantes aos horizontes subsuperficiais.Palavras-chave: Semiárido. Matas Secas. Carbono orgânico do solo. FRACTION OF ORGANIC MATTER IN SOIL UNDER DECIDUOUS FORMATIONS IN THE NORTH OF MINASABSTRACT -The dynamics of organic matter influences the main chemical, physical and biological processes in soil, and often determines their chemical behavior and fertility. Therefore, it is essential to quantify the fractions that make up the organic matter to the understanding of pedogenic processes that reflect or induce soil properties. The aim of the study was to evaluate the behavior of soil organic matter in different soil profiles under deciduous formations, through fractionation of organic matter and obtain their different oxidizable fractions. Ten soil profiles were described and collected in areas of deciduous formations in the state of Minas Gerais and Bahia. Chemical and physical analyzes were performed on each horizon. For organic matter fractions, the fractionation of humic substances and subsequent determination of carbon in each fraction was performed: humin (HUM -C) , fulvic acid (C -FAF) and humic acid (C -FAH) and calculated their relations and percentage of each fraction relative to total organic carbon (COT) , %FAF, %FAH, %HUM and %EA, beyond fractions oxidizable C in each evaluated horizon. Humic substances that make up the organic matter in the soil of seasonal dry forests profiles showed that this compartment MOS showed a predominance of the humin f...

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“…The lower C-HAF found in all systems may have occurred because this humic fraction can easily migrate in soil with high porosity (Martins et al, 2009). Therefore, in the evaluated areas the soil porosity may facilitate the movement of C-HAF through the soil horizons.…”

Section: Resultsmentioning

confidence: 92%

Short Communication: Soil carbon pools in different pasture systems

et al. 2016

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The aim of this study was to assess the carbon pools of a tropical soil where the native forest was replaced with different pasture systems. We studied five pasture production systems, including four monoculture systems with forage grasses such as Andropogon, Brachiaria, Panicum, and Cynodon, and an agroforestry system as well as a native vegetation plot. Greater availability of fulvic acid was detected in the agroforestry system as compared with that in the other systems. Higher lability of C was detected in the Andropogon system during the dry and rainy seasons and during the dry season in Cynodon. During the dry season, all pastures systems showed deficits in the net removal of atmospheric CO2. The structure and practices of the agroforestry system enables more carbon to be sequestered in the soil as compared with the monoculture pasture, suggesting that it is an important practice to mitigate climatic change and to improve soil quality.

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Carbono orgânico nas frações granulométricas e substâncias húmicas de um Latossolo Vermelho Amarelo distrófico - LVAd sob diferentes agrossistemas

Cited by 19 publications

References 10 publications

Can Soil Organic Carbon Pools Indicate the Degradation Levels of Pastures in the Atlantic Forest Biome?

Can Soil Organic Carbon Pools Indicate the Degradation Levels of Pastures in the Atlantic Forest Biome?

Frações Da Matéria Orgânica Em Solos Sob Formações Deciduais No Norte De Minas Gerais

Short Communication: Soil carbon pools in different pasture systems

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