Substâncias húmicas e suas interações com Fe e Al em Latossolo subtropical sob diferentes sistemas de manejo de pastagem

Santana, Graciele Sarante; Dick, Deborah Pinheiro; Jacques, Aino Victor Avila; Chitarra, Guilherme da Silva

doi:10.1590/s0100-06832011000200015

Cited by 12 publications

(10 citation statements)

References 33 publications

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“…For the Al, a contrary trend was observed, since this ion is more associated with the FA fraction, even after extract purification with DAX-8 resin (Table 5). Similar results were observed by Sarante et al (2011), who verified a higher molar Al/Fe ratio in FA than in HA, confirming the higher affinity of Al for the FA organic ligands. The higher affinity of Fe and Al for these humic fractions may be due to differences in their chemical composition.…”

Section: Iron and Al Contents Associated With Som Chemical Fractionssupporting

confidence: 88%

“…The same trend was observed for Al, which showed mean values of 11,088 mg kg -1 in HSs, 234 mg kg -1 in HCl extract, and 53 mg kg -1 in water extract (Table 5). Both the Fe and Al contents observed in the SOM fractions were generally higher than those observed in humic and non-hydromorphic soils of altitude in the state of Rio Grande do Sul (Sarante et al, 2011).…”

Section: Iron and Al Contents Associated With Som Chemical Fractionsmentioning

confidence: 60%

“…In southern Brazil, these environments occur in specific sites of the drainage basin of the Iguaçu River and in the upper montane areas of Paraná, as well as in the higher altitude positions of the eruptive plateau of Paraná, Santa Catarina, and Rio Grande do Sul (Maack, 2002;Potes et al, 2010;Sarante et al, 2011;Scheer et al, 2011). Some of these regions associated with rivers and hydromorphic conditions have been considered priority areas for inclusion in the ecological-economic zoning defined by the new Brazilian forest code (Brasil, 2012) because of their capacity to provide ecosystem services.…”

Section: Introductionmentioning

confidence: 99%

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Organic Matter Stocks and the Interactions of Humic Substances with Metals in Araucaria Moist Forest Soil with Humic and Histic Horizons

Hanke

Dick

2017

Rev. Bras. Ciênc. Solo

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Soils with humic and histic horizons in tropical and subtropical ecosystems play an important role in determining the atmospheric C stock and its stabilization, climate regulation, water holding capacity, and environmental filtering, due to the different functions of soil organic matter (SOM). However, the processes and mechanisms that regulate SOM dynamics in these soils are not clear. The objectives of this study were: i) determine the C and N stocks and ii) investigate the SOM chemical fractions and their interactions with Fe and Al ions in soils with humic and histic horizons of a toposequence under Araucaria moist forest in southern Brazil. The soils sampled were classified as Humic Hapludox (top -not hydromorphic), Fluvaquentic Humaquepts (lower third -hydromorphic), and Typic Haplosaprists (floodplain -hydromorphic). The C and N contents were determined in bulk soil samples and SOM chemical fractions; in these fractions, Fe and Al co-extracted contents were also determined. The chemical composition of humin and humic acid fractions was investigated by FTIR spectroscopy. The C content in the toposequence increased from the top to the lowest position. The differences observed in SOM content and SOM chemical composition were defined by the differences in soil water regime. The amount of C stored in the subsurface horizons is about 70 % of total organic C. The carbohydrate-like structures in the humin fraction were protected from solubilization through interaction with iron oxides, which may represent an important mechanism for labile organic compound preservation in these soils. The soluble humic substances showed the highest Fe and Al contents, and their compartments have different affinities for Fe and Al.

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Section: Iron and Al Contents Associated With Som Chemical Fractionssupporting

confidence: 88%

Section: Iron and Al Contents Associated With Som Chemical Fractionsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

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Organic Matter Stocks and the Interactions of Humic Substances with Metals in Araucaria Moist Forest Soil with Humic and Histic Horizons

Hanke

Dick

2017

Rev. Bras. Ciênc. Solo

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“…Solo, 38:923-933, 2014 management (Fontana et al, 2006). Several studies have reported the influence of agricultural management systems on the humic fractions (Barreto et al, 2008;Portugal et al, 2008;Santana et al, 2011). The use of no-tillage, for example, preserves organic C in all humic fractions (Rosa et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Effect of management systems and cover crops on organic matter dynamics of soil under vegetables

Souza

Figueiredo

Madeira

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYVegetable production in conservation tillage has increased in Brazil, with positive effects on the soil quality. Since management systems alter the quantity and quality of organic matter, this study evaluated the influence of different management systems and cover crops on the organic matter dynamics of a dystrophic Red Latosol under vegetables. The treatments consisted of the combination of three soil tillage systems: no-tillage (NT), reduced tillage (RT) and conventional tillage (CT) and of two cover crops: maize monoculture and maizemucuna intercrop. Vegetables were grown in the winter and the cover crops in the summer for straw production. The experiment was arranged in a randomized block design with four replications. Soil samples were collected between the crop rows in three layers (0.0-0.05, 0.05-0.10, and 0.10-0.30 m) twice: in October, before planting cover crops for straw, and in July, during vegetable cultivation. The total organic carbon (TOC), microbial biomass carbon (MBC), oxidizable fractions, and the carbon fractions fulvic acid (C FA ), humic acid (C HA ) and humin (C HUM ) were determined. The main changes in these properties occurred in the upper layers (0.0-0.05 and 0.05-0.10 m) where, in general, TOC levels were highest in NT with maize straw. The MBC levels were lowest in CT systems, indicating sensitivity to soil disturbance. Under mucuna, the levels of C HA were lower in RT than NT systems, while the C FA levels were lower in RT than CT. For vegetable production, the C HUM values were lowest in the 0.05-0.10 m layer under CT. With regard to the oxidizable fractions, the tillage systems differed only in the most labile C fractions, with higher levels in NT than CT in the 0.0-0.05 m layer in both summer and winter, with A produção de hortaliças em sistemas conservacionistas tem crescido no Brasil com reflexos positivos na qualidade do solo. Considerando que os sistemas de manejo alteram a quantidade e a qualidade da matéria orgânica, este trabalho teve por objetivo avaliar a influência de diferentes sistemas de manejo e cobertura vegetal na dinâmica da matéria orgânica de um Latosssolo Vermelho distrófico, cultivado com hortaliças. Os tratamentos avaliados consistiram na combinação de três sistemas de manejo de solo: plantio direto (PD); plantio com preparo reduzido (PPR); e preparo convencional (PC), e duas coberturas vegetais: milho e consórcio milho e mucuna. No inverno, foram cultivadas hortaliças; e no verão, cobertura vegetal para palhada. O delineamento experimental utilizado foi de blocos ao acaso com quatro repetições. As amostras de solo foram coletadas na entrelinha de cultivo da hortaliça em três profundidades (0,0-0,05; 0,05-0,10 e 0,10-0,30 m), em duas épocas de amostragem: em outubro, antes do plantio das culturas para formação de palhada; e em julho, durante o cultivo da hortaliça. Foram determinados o carbono orgânico total (COT), o carbono da biomassa microbiana (CBM), das frações oxidáveis, e o carbono das frações ácido fúlvico (C AF ), ácido húmico (C AH ) e hum...

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“…Essa fração orgânica, composta principalmente por compostos bioquimicamente lábeis e de origem microbiana e exsudação radicular (SANTANA et al, 2011), aumentou sua proporção (CHCl/COT) gradualmente em profundidade em todos os ambientes, sugerindo um processo de migração (Tabela 2). Entre os ambientes, a relação CHCl/COT aumentou na camada 0,0-0,05m dos ambientes afetados pela ação antrópica (FP, LA e CNq).…”

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Substâncias húmicas em Latossolo subtropical de altitude sob usos e manejos distintos

2012

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Substâncias húmicas e suas interações com Fe e Al em Latossolo subtropical sob diferentes sistemas de manejo de pastagem

Abstract: RESUMOGonçalves 7712, CEP 91540-000 Porto Alegre (RS).

Cited by 12 publications

References 33 publications

Organic Matter Stocks and the Interactions of Humic Substances with Metals in Araucaria Moist Forest Soil with Humic and Histic Horizons

Organic Matter Stocks and the Interactions of Humic Substances with Metals in Araucaria Moist Forest Soil with Humic and Histic Horizons

Effect of management systems and cover crops on organic matter dynamics of soil under vegetables

Substâncias húmicas em Latossolo subtropical de altitude sob usos e manejos distintos

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