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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
15/05/2025 |
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Data da última atualização: |
15/05/2025 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
RAMALHO, B.; MELO, V. F.; DIECKOW, J.; BROWN, G. G.; SIMON, P. L.; CORRÊA, R. S. |
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Afiliação: |
BRUNA RAMALHO, UNIVERSIDADE FEDERAL DO PARANÁ; VANDER FREITAS MELO, UNIVERSIDADE FEDERAL DO PARANÁ; JEFERSON DIECKOW, UNIVERSIDADE FEDERAL DO PARANÁ; GEORGE GARDNER BROWN, CNPF; PRISCILA LUZIA SIMON, UNIVERSIDADE FEDERAL DO PARANÁ; RODRIGO STUDART CORRÊA, UNIVERSIDADE DE BRASÍLIA. |
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Título: |
A novel sequential chemical extractions protocol to access mineral phases stabilizing organic matter in Amazonian Dark Earths (Holocene). |
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Ano de publicação: |
2025 |
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Fonte/Imprenta: |
Quaternary International, v. 730-731, 109779, 2025. |
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ISSN: |
1040-6182 |
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DOI: |
https://doi.org/10.1016/j.quaint.2025.109779 |
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Idioma: |
Português |
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Conteúdo: |
The association of organic matter with pedogenic minerals plays a crucial role in the stabilization of soil organic matter (SOM). To evaluate the contribution of different mineral phases to mineral-organic associations, the clay fractions of both small (<500 μm) and large (>500 μm) soil aggregates from Amazonian Dark Earths (ADEs) and reference soils (Ref) across five sites in the Brazilian Amazon were subjected to of sequential chemical extraction: hydroxylamine (HL), sodium dithionite (DT), sodium pyrophosphate (PYR), and NaOH. The extraction residues were analyzed by X-ray diffraction, thermogravimetry, and dry combustion for carbon (C) concentration. On average, PYR extracted 58 % of the C in both ADE and Ref soils, indicating that this extracted C predominantly corresponds to fractions associated with individual or poorly polymerized Fe and Al octahedral groups. The sequential extraction protocol, incorporating dithionite before PYR, facilitated an enhanced separation of mineral-organic association compartments. Among the minerals analyzed, kaolinite and hematite of low crystallinity were found to be more significant in mineral-organic associations compared to their high crystalline counterparts. Despite the presence of abundant small crystal-sizeof goethite in the samples, hematite was more effective in organo-mineral interactions. In the Amazonian environment, mineral-organic associations in the clay fraction occur indistinctly in ADE and adjacent Refs soils lacking an anthropic A horizon. These specific organic-mineral associations are likely responsible for the reduced decomposition rates and the sustained high levels of SOM in ADEs for over thousands of years since their anthropic formation (Holocene), even under the humid tropical climate. MenosThe association of organic matter with pedogenic minerals plays a crucial role in the stabilization of soil organic matter (SOM). To evaluate the contribution of different mineral phases to mineral-organic associations, the clay fractions of both small (<500 μm) and large (>500 μm) soil aggregates from Amazonian Dark Earths (ADEs) and reference soils (Ref) across five sites in the Brazilian Amazon were subjected to of sequential chemical extraction: hydroxylamine (HL), sodium dithionite (DT), sodium pyrophosphate (PYR), and NaOH. The extraction residues were analyzed by X-ray diffraction, thermogravimetry, and dry combustion for carbon (C) concentration. On average, PYR extracted 58 % of the C in both ADE and Ref soils, indicating that this extracted C predominantly corresponds to fractions associated with individual or poorly polymerized Fe and Al octahedral groups. The sequential extraction protocol, incorporating dithionite before PYR, facilitated an enhanced separation of mineral-organic association compartments. Among the minerals analyzed, kaolinite and hematite of low crystallinity were found to be more significant in mineral-organic associations compared to their high crystalline counterparts. Despite the presence of abundant small crystal-sizeof goethite in the samples, hematite was more effective in organo-mineral interactions. In the Amazonian environment, mineral-organic associations in the clay fraction occur indistinctly in ADE and adjacent Refs soils lacking a... Mostrar Tudo |
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Palavras-Chave: |
Dithionite method; Horizonte antrópico; Método de ditionito; Terra preta da Amazônia. |
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Thesagro: |
Extração; Matéria Orgânica; Oxido de Ferro; Pirofosfato. |
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Thesaurus Nal: |
Amazonia; Extraction; Iron oxides; Organic matter; Pyrophosphates. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02868naa a2200361 a 4500
001 2175641
005 2025-05-15
008 2025 bl uuuu u00u1 u #d
022 $a1040-6182
024 7 $ahttps://doi.org/10.1016/j.quaint.2025.109779$2DOI
100 1 $aRAMALHO, B.
245 $aA novel sequential chemical extractions protocol to access mineral phases stabilizing organic matter in Amazonian Dark Earths (Holocene).$h[electronic resource]
260 $c2025
520 $aThe association of organic matter with pedogenic minerals plays a crucial role in the stabilization of soil organic matter (SOM). To evaluate the contribution of different mineral phases to mineral-organic associations, the clay fractions of both small (<500 μm) and large (>500 μm) soil aggregates from Amazonian Dark Earths (ADEs) and reference soils (Ref) across five sites in the Brazilian Amazon were subjected to of sequential chemical extraction: hydroxylamine (HL), sodium dithionite (DT), sodium pyrophosphate (PYR), and NaOH. The extraction residues were analyzed by X-ray diffraction, thermogravimetry, and dry combustion for carbon (C) concentration. On average, PYR extracted 58 % of the C in both ADE and Ref soils, indicating that this extracted C predominantly corresponds to fractions associated with individual or poorly polymerized Fe and Al octahedral groups. The sequential extraction protocol, incorporating dithionite before PYR, facilitated an enhanced separation of mineral-organic association compartments. Among the minerals analyzed, kaolinite and hematite of low crystallinity were found to be more significant in mineral-organic associations compared to their high crystalline counterparts. Despite the presence of abundant small crystal-sizeof goethite in the samples, hematite was more effective in organo-mineral interactions. In the Amazonian environment, mineral-organic associations in the clay fraction occur indistinctly in ADE and adjacent Refs soils lacking an anthropic A horizon. These specific organic-mineral associations are likely responsible for the reduced decomposition rates and the sustained high levels of SOM in ADEs for over thousands of years since their anthropic formation (Holocene), even under the humid tropical climate.
650 $aAmazonia
650 $aExtraction
650 $aIron oxides
650 $aOrganic matter
650 $aPyrophosphates
650 $aExtração
650 $aMatéria Orgânica
650 $aOxido de Ferro
650 $aPirofosfato
653 $aDithionite method
653 $aHorizonte antrópico
653 $aMétodo de ditionito
653 $aTerra preta da Amazônia
700 1 $aMELO, V. F.
700 1 $aDIECKOW, J.
700 1 $aBROWN, G. G.
700 1 $aSIMON, P. L.
700 1 $aCORRÊA, R. S.
773 $tQuaternary International$gv. 730-731, 109779, 2025.
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| 1. |  | GUIMARÃES, I. V. P.; BAUMANN, S. S. R. T.; GOMES, K. M. A.; FERREIRA, C. R. B.; GAMA, J. R. V.; RUSCHEL, A. R.; ANDRADE, D. F. C. de. Caracterização do estoque madeireiro remanescente após a extração seletiva de madeira na Floresta Nacional do Tapajós. Biodiversidade Brasileira, v. 14, n. 2, 2024.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 4 |
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