Al speciation in tropical podzols of the upper Amazon Basin: A solid-state 27Al MAS and MQMAS NMR study

Bardy, Marion; Bonhomme, Christian; Fritsch, Emmanuel; Maquet, Jocelyne; Hajjar, Redouane; Allard, Thierry; Derenne, Sylvie; Calas, Georges

doi:10.1016/j.gca.2007.04.024

Cited by 33 publications

(44 citation statements)

References 41 publications

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“…In the following, the evolutions in free lipid abundance and composition are discussed in relation with the processes going on in the investigated soil sequence and the evolution of total SOM, as studied by do Nascimento et al (2004) and Bardy et al (2007Bardy et al ( , 2008. New data inferred from the present study and adding to the comprehension of the processes are eventually emphasized.…”

Section: Lipids and The Podzolisation Processmentioning

confidence: 59%

“…However, since a denser rooting was not observed in II Bh as compared to the other deep horizons, a larger input of lipids by roots in II Bh seems unlikely. However, in a previous study, Bardy et al (2007) have shown that SOM is highly complexed with aluminum in pit II, especially in II Bhs and II 2BCs. In these horizons, lipids may thus also occur as organo-metallic complexes and therefore be transferred to the bound lipid pool, as observed by Amblès et al (1985) after addition of Fe.…”

Section: Mass Balancementioning

confidence: 79%

“…In pit III, the contribution of free lipids to SOM decreases with depth. In this pit, where there are less organo-metallic complexes than in pit II (Bardy et al 2007), the classically observed decreased amount of free lipids with depth may be assigned to several factors such as (i) a decreased rooting and thus a lower input of lipids with depth, (ii) a low solubility of lipids in water and thus their low illuviation, (iii) the incorporation of lipids into macromolecules, (iv) a higher degradation of lipids as compared with other SOM. Although III 2BCs is indurated, it contains significant amounts of lipids.…”

Section: Mass Balancementioning

confidence: 93%

“…Amblès et al (1989b) showed that C 29 and C 31 n-alkan-2-ones tend to be more associated than shorter ones with mineral phases. This may explain their reduced contribution in II Bhs and II 2BCs, where Bardy et al (2007) showed that there are abundant organometallic complexes.…”

Section: Alkanonesmentioning

confidence: 99%

“…The formation of a shallow, poorly-differentiated podzol (Bhs) in pit II, with a high abundance of organo-metallic complexes (mainly with Al) (Bardy et al 2007); ii. The differentiation at greater depth of separate Bh and 2BCs horizons in pit II, probably formed through the illuviation of less soluble organic matter from surface horizons for the former, and the translocation of soluble or colloidal organic matter from II Bhs for the latter ); iii.…”

Section: Lipids and The Podzolisation Processmentioning

confidence: 99%

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Evolution of lipid abundance and molecular composition during the podzolisation of laterites in the upper Amazon basin

Bardy¹,

Derenne²,

Fritsch³

2008

Biogeochemistry

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In the upper Amazon basin, podzolisation involves the remobilization of large amounts of organic matter and chemical elements (Fe, Al, Si) previously accumulated in lateritic formations. In order to better understand the fate of organic matter in podzolic environments in this area, the evolution of lipid abundance and molecular composition were studied along a representative soil sequence showing the transition between a latosol and a well-developed podzol. Total solvent extracts were obtained from eight key soil samples from three profiles and their overlying litters, and enable us to follow both lateral and vertical evolutions. Lipid composition was determined by gas chromatography-mass spectrometry (GC-MS). Major compound classes include alkanes, alkanones, alkanols, alkanoic acids, x-hydroxyacids, as well as aromatics, steroids and triterpenoids. Free lipids do not accumulate in the early stages of podzolisation but are abundant in well-developed podzolic horizons, possibly due to (i) combined acidity and waterlogging, (ii) limited amounts of complexing elements, (iii) a decreased microbial activity. The evolution of lipid composition is consistent with podzolisation mechanisms previously highlighted in the sequence. This paper provides further evidence for the occurrence of anoxic conditions in deep waterlogged podzolic horizons. It also shows that aromatic, phytotoxic compounds are stabilized in the welldeveloped podzol. This may play a role in the vegetation changes associated with podzolisation in the area.

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Section: Lipids and The Podzolisation Processmentioning

confidence: 59%

Section: Mass Balancementioning

confidence: 79%

Section: Mass Balancementioning

confidence: 93%

Section: Alkanonesmentioning

confidence: 99%

Section: Lipids and The Podzolisation Processmentioning

confidence: 99%

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