Biodegradation of synthetic organo-metallic complexes of iron and aluminium with selected metal to carbon ratios

Boudot, Jean‐Pierre; Hadj^Brahim, A. Bel; Steiman, R.; Seigle‐Murandi, F.

doi:10.1016/0038-0717(89)90088-6

Cited by 158 publications

(118 citation statements)

References 14 publications

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“…This mechanism explains the depleted concentration of labile Fe pools in the E horizon (leaving mostly residual Fe; Table 3) and the high concentrations of organically bound Fe in the B horizons. Immobilization induced by the partial microbial breakdown of organic carrier molecules by microbes, as proposed by Boudot et al (1989) and Lundström et al(2000), could also result in the same horizonal patterns of reduced C:Fe in deeper soils, and the long-term accumulation of organic matter that is more recalcitrant and resistant to microbial breakdown.…”

Section: Chemistry Of Drainage Waters: Soil Solution and Stream Watermentioning

confidence: 78%

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Dynamics of oxidized and reduced iron in a northern hardwood forest

et al. 2010

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Section: Chemistry Of Drainage Waters: Soil Solution and Stream Watermentioning

confidence: 78%

“…Decreasing carbon-metal ratios are caused by the further complexation of Fe and Al (McKeague et al 1978) and/or microbial breakdown of the organic carrier molecules (Boudot et al 1989;Lundström et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of oxidized and reduced iron in a northern hardwood forest

et al. 2010

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“…The importance of amorphous clay materials for SOC stabilization and aggregation in allophanic Andisols has often been documented (e.g. Boudot et al, 1989;Torn et al, 1997), and is assumed to be the main stabilization mechanism in this soil type.…”

Section: Physical Protectionmentioning

confidence: 97%

“…Physico-chemical associations namely tend to promote aggregation. Boudot et al (1989) observed that the binding of metals (such as Al and Fe) per se in metal-humusclay complexes could not be regarded as responsible for any significant protective effect against biodegradation. The formation of an insoluble metallic hydroxide trapping and wrapping SOC molecules, and therefore either preserving it from access by soluble soil enzymes or preventing their movement to immobile enzymatic constituents associated with microbial cells (=inaccessibility or physical protection), would better account for the observed protective effect than the chemical binding per se.…”

Section: Interactions Between Soil Componentsmentioning

confidence: 97%

Aggregate and soil organic carbon dynamics in South Chilean Andisols

et al. 2005

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Abstract. Extreme sensitivity of soil organic carbon (SOC) to climate and land use change warrants further research in different terrestrial ecosystems. The aim of this study was to investigate the link between aggregate and SOC dynamics in a chronosequence of three different land uses of a south Chilean Andisol: a second growth Nothofagus obliqua forest (SGFOR), a grassland (GRASS) and a Pinus radiata plantation (PINUS). Total carbon content of the 0-10 cm soil layer was higher for GRASS (6.7 kg C m −2 ) than for PINUS (4.3 kg C m −2 ), while TC content of SG-FOR (5.8 kg C m −2 ) was not significantly different from either one. High extractable oxalate and pyrophosphate Al concentrations (varying from 20.3-24.4 g kg −1 , and 3.9-11.1 g kg −1 , respectively) were found in all sites. In this study, SOC and aggregate dynamics were studied using size and density fractionation experiments of the SOC, δ 13 C and total carbon analysis of the different SOC fractions, and C mineralization experiments. The results showed that electrostatic sorption between and among amorphous Al components and clay minerals is mainly responsible for the formation of metal-humus-clay complexes and the stabilization of soil aggregates. The process of ligand exchange between SOC and Al would be of minor importance resulting in the absence of aggregate hierarchy in this soil type. Whole soil C mineralization rate constants were highest for SGFOR and PINUS, followed by GRASS (respectively 0.495, 0.266 and 0.196 g CO 2 -C m −2 d −1 for the top soil layer). In contrast, incubation experiments of isolated macro organic matter fractions gave opposite results, showing that the recalcitrance of the SOC decreased in another order: PINUS>SGFOR>GRASS. We deduced that electrostatic sorption processes and physical protection of SOC in soil aggregates were the main processes determining SOC stabilization. As a result, high aggregate carbon concentraCorrespondence to: D. Huygens (dries.huygens@ugent.be) tions, varying from 148 till 48 g kg −1 , were encountered for all land use sites. Al availability and electrostatic charges are dependent on pH, resulting in an important influence of soil pH on aggregate stability. Recalcitrance of the SOC did not appear to largely affect SOC stabilization. Statistical correlations between extractable amorphous Al contents, aggregate stability and C mineralization rate constants were encountered, supporting this hypothesis. Land use changes affected SOC dynamics and aggregate stability by modifying soil pH (and thus electrostatic charges and available Al content), root SOC input and management practices (such as ploughing and accompanying drying of the soil).

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“…strongly controls the stability of OC in soils and sediments, as it protects the OC from 1 microbial degradation (Boudot 1989 4 and can diffuse across the sediment water interface into anoxic bottom water (Peter et al been repeatedly shown to be important for the release and cycling of other compounds like 7 phosphate (PO 4 3− ) (Mortimer 1941) and arsenic (Smedley and Kinniburgh 2013).…”

Section: Introductionmentioning

confidence: 99%

Widespread release of dissolved organic carbon from anoxic boreal lake sediments

2017

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1Sediments in boreal lakes are important components of the carbon cycle because they receive 2 and store large amounts of organic carbon (OC), and at the same time are a source of 3 greenhouse gases. Under anoxic condition, sediment OC can be lost through dissolution from 4 the solid phase and subsequent diffusion to the water column. Even though this process may 5 have implications for sediment OC budgets, it has yet not been studied systematically. We

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Biodegradation of synthetic organo-metallic complexes of iron and aluminium with selected metal to carbon ratios

Cited by 158 publications

References 14 publications

Dynamics of oxidized and reduced iron in a northern hardwood forest

Dynamics of oxidized and reduced iron in a northern hardwood forest

Aggregate and soil organic carbon dynamics in South Chilean Andisols

Widespread release of dissolved organic carbon from anoxic boreal lake sediments

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