Substâncias húmicas e suas relações com o grau de subsidência em Organossolos de diferentes ambientes de formação no Brasil

Anjos, Lúcia Helena Cunha dos; Pereira, Marcos Gervásio; Valladares, Gustavo Souza; Pérez, Daniel Vidal

doi:10.1590/s1806-66902013000200003

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…According to Orlov (1998), increase in the C stocks of HAF may be an indicator of improvement in the quality of the soil humus or of the increase in biological activity, which promotes the synthesis of more condensed humic substances. Similar results were observed by Ebeling et al (2013); upon evaluating the C stock in humic fractions of diverse samples of Organossolo (Histosol) from different regions of Brazil, they observed that the values of the C HAF /C FAF ratio were greater than 1 and concluded that the environmental conditions favored the stabilization of C in the HAF. In contrast, Leite et al (2003) observed that the C HAF /C FAF ratio was greater in the soil under native vegetation than in the soil under agricultural production systems, explaining that in natural forests, without disturbance of the soil, there is greater polymerization of humic compounds, increasing the proportion of the HAF in relation to the FAF.…”

Section: Carbon Stocks In the Humic Substancessupporting

confidence: 80%

Organic Matter Fractions in a Quartzipsamment Under Cultivation of Irrigated Mango in the Lower São Francisco Valley Region, Brazil

Cardoso

Lima

Cunha

et al. 2015

Rev. Bras. Ciênc. Solo

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aBstractimproper land use has lead to deterioration and depletion of natural resources, as well as a significant decline in agricultural production, due to decreased soil quality. Removal of native vegetation to make way for agricultural crops, often managed inadequately, results in soil disruption, decreased nutrient availability, and decomposition of soil organic matter, making sustainable agricultural production unviable. Thus, the aim of the present study was to evaluate the impact of growing irrigated mango (over a 20 year period) on the organic carbon (Oc) stocks and on the fractions of soil organic matter (sOM) in relation to the native caatinga (xeric shrubland) vegetation in the lower são Francisco valley region, Brazil. The study was carried out on the Boa Esperança Farm located in Petrolina, Pernambuco, Brazil. In areas under irrigated mango and native caatinga, soil samples were collected at the 0-10 and 10-20 cm depths. After preparing the soil samples, we determined the Oc stocks, carbon of humic substances (fulvic acid fractions, humic acid fractions, and humin fractions), and the light and heavy SOM fractions. Growing irrigated mango resulted in higher Oc stocks; higher c stocks in the fulvic acid, humic acid, and humin fractions;

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Section: Carbon Stocks In the Humic Substancessupporting

confidence: 80%

Organic Matter Fractions in a Quartzipsamment Under Cultivation of Irrigated Mango in the Lower São Francisco Valley Region, Brazil

Cardoso

Lima

Cunha

et al. 2015

Rev. Bras. Ciênc. Solo

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“…Isso ocorre porque a rotação pode promover a ciclagem de nutrientes e melhorar a estrutura do solo (TEJADA; HERNANDEZ; GARCIA, 2008), além de aumentar o estoque de carbono (RIBEIRO et al, 2011;ROSOLEM;CALONEGO, 2013). Diferentes sistemas de manejo influenciam diretamente na quantidade de carbono orgânico dos solos (EBELING et al, 2013;FONTANA et al, 2011;TOMASI;INDA;DICK, 2012).…”

Section: Introductionunclassified

Humic substances in soil cultivated with cover crops rotated with maize and soybean

Rosa

Nóbrega

Mauli

et al. 2017

Revista Ciência Agronômica

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RESUMO -A matéria orgânica (MO), principalmente suas frações, é indicadora da qualidade do solo e, na agricultura, está relacionada ao aporte de material vegetal por meio de cultivos. Neste contexto, a adoção de sistemas de manejo que aumentassem o fornecimento de MO, consequentemente, melhorariam a qualidade do solo. Assim, neste trabalho foram avaliadas alterações nos teores de MO e substâncias húmicas em um LATOSSOLO VERMELHO Eutroférrico, cultivado com plantas de cobertura em rotação com milho e soja. Em 2010, sob sistema de plantio direto, foram implantadas as plantas de cobertura mucuna anã (Mucuna deeringiana), feijão guandu anão (Cajanus cajan) e crotalaria juncea (Crotalaria juncea). Em 2011 foram implantadas as culturas do milho e as plantas de cobertura canola (Brassica napus), crambe (Crambe abyssinica) e nabo forrageiro (Raphanus sativus) e, em sequência, a cultura da soja. O teor de MO e carbono das frações húmicas foram determinados anteriormente à implantação, após o manejo da cobertura vegetal e após a colheita dos cultivos. No ano agrícola 2010/2011, após manejo das plantas de cobertura leguminosas, observaram-se alterações na concentração total de substâncias húmicas do solo. Em 2011/2012 houve incremento no teor de carbono e alteração no teor de ácidos fúlvicos. Dessa forma, as plantas de cobertura proporcionaram mais carbono na fração ácidos fúlvicos que contribui com aspectos de fertilidade do solo (CTC). O manejo com as plantas de cobertura, leguminosas e brassicáceas, e o cultivo de milho e soja aumentaram teor de MOS em um curto período de tempo, sendo o manejo considerado adequado para as condições estudadas. Palavras-chave: Adubação verde. Matéria orgânica do solo. Sistema de plantio direto.ABSTRACT -Organic matter (OM), especially its fractions, is an indicator of soil quality and in agriculture is related to the input of plant material from cultivation. In this context, the adoption of management systems that increase the supply of OM would consequently improve soil quality. In this work therefore, changes in the levels of OM and humic substances were evaluated in a eutroferric Red Latossol, cultivated with cover plants rotated with maize and soybean. In 2010, Mucuna deeringiana, Cajanus cajan and Crotalaria juncea were planted as cover crops under a no-till system. In 2011, the maize was planted together with the cover crops Brassica napus, Crambe abyssinica and Raphanus sativus, followed by the soybean. The levels of OM and carbon in the humic fractions were determined prior to planting, after management of the cover crops, and after the crop harvest. In the 2010/2011 crop year, after management of the leguminous cover crops, changes were seen in the total concentrations of humic substances in the soil. From 2011 to 2012 there was an increase in carbon content and a change in the levels of fulvic acids. The cover plants therefore provided more carbon for the fulvic acid fraction that contributes to aspects of soil fertility (CEC). A management with cover crops of legumes and brassi...

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“…The TOC content of the soil depends among other factors on the climate, on the content and nature of the clays, on land use, and on the management and drainage systems(Ebeling et al, 2013). According toMartins et al (2010), water deficit is the main limiting factor in semi-arid environments.…”

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confidence: 99%

Carbon and Nitrogen Stock Under Different Types of Land Use in a Seasonally Dry Tropical Forest

Valbrun¹,

Andrade²,

Almeida³

et al. 2018

JAS

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The aim of this study, was to analyse the effect of cover vegetation change on stocks of Total Organic Carbon (ST.TOC) and Total Nitrogen (ST.TN) in soils of a Seasonally Dry Tropical Forest in the Brazilian semi-arid region. The study was carried out on three farms located on a typical Orthic Chromic Luvisol in an SDTF. Soil samples were collected from trenches, 70 × 70 cm in size, in the 0-10, 10-20, 20-30, 30-40, 40-60 and 60-80 cm layers, under four types of land use: dense Caatinga (DC), open Caatinga (OC), agriculture (AG) and pasture (PA). The following attributes were evaluated: bulk density, Total Organic Carbon (TOC), Total Nitrogen (TN), ST.TOC and ST.TN. The data were compared using the Mann-Whitney test (p ≤ 0.05). Hierarchical Grouping Analysis (HGA) was used to understand the behaviour of the attributes evaluated between cover vegetation types. Using HGA resulted in the formation of three distinct groups for the types of land use under investigation. The highest mean values for ST.TOC (11.29 Mg ha-1) and ST.TN (3.36 Mg ha-1) were found in CD and CA. The changes in land use in the SDTF had an effect on ST.TOC and ST.TN. It is therefore necessary to adopt strategies and strengthen conservation practices in areas of agricultural and pasture, and reduce the process of degradation and further the process of recovery in these areas. Such action will reduce the loss of C and N, and increase the levels and stocks of TOC and TN.

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Substâncias húmicas e suas relações com o grau de subsidência em Organossolos de diferentes ambientes de formação no Brasil

Cited by 9 publications

References 18 publications

Organic Matter Fractions in a Quartzipsamment Under Cultivation of Irrigated Mango in the Lower São Francisco Valley Region, Brazil

Organic Matter Fractions in a Quartzipsamment Under Cultivation of Irrigated Mango in the Lower São Francisco Valley Region, Brazil

Humic substances in soil cultivated with cover crops rotated with maize and soybean

Carbon and Nitrogen Stock Under Different Types of Land Use in a Seasonally Dry Tropical Forest

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