Soil organo-mineral associations formed by co-precipitation of Fe, Si and Al in presence of organic ligands

Tamrat, Wuhib Zewde; Rose, Jérôme; Grauby, Olivier; Dœlsch, Emmanuel; Levard, Clément; Chaurand, Perrine; Basile‐Doelsch, Isabelle

doi:10.1016/j.gca.2019.05.043

Cited by 68 publications

(54 citation statements)

References 72 publications

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“…Some work has identified that SRO-Fe III -OM co-precipitates with low C/Fe ratios provide resistance to microbial reduction 63,64 , whereas other work has emphasized structural properties (conformation and micro-aggregation) as the mechanism that retards dissolution [65][66][67] . SRO Fe-OM phases are often co-precipitated with Al and Si ions 68 -which can retard recrystallization 69 -and given the co-association of Al and Fe with OM in humid soils, Al is a strong candidate for protecting Fe against reduction. However, studies that have examined Al and Si co-precipitated Fe-(oxyhydr)oxides found those ions also make the co-precipitates more susceptible to reductive dissolution 70 .…”

Section: Resultsmentioning

confidence: 99%

Iron-mediated organic matter decomposition in humid soils can counteract protection

et al. 2020

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Soil organic matter (SOM) is correlated with reactive iron (Fe) in humid soils, but Fe also promotes SOM decomposition when oxygen (O 2) becomes limited. Here we quantify Femediated OM protection vs. decomposition by adding 13 C dissolved organic matter (DOM) and 57 Fe II to soil slurries incubated under static or fluctuating O 2. We find Fe uniformly protects OM only under static oxic conditions, and only when Fe and DOM are added together: de novo reactive Fe III phases suppress DOM and SOM mineralization by 35 and 47%, respectively. Conversely, adding 57 Fe II alone increases SOM mineralization by 8% following oxidation to 57 Fe III. Under O 2 limitation, de novo reactive 57 Fe III phases are preferentially reduced, increasing anaerobic mineralization of DOM and SOM by 74% and 32-41%, respectively. Periodic O 2 limitation is common in humid soils, so Fe does not intrinsically protect OM; rather reactive Fe phases require their own physiochemical protection to contribute to OM persistence.

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Section: Resultsmentioning

confidence: 99%

Iron-mediated organic matter decomposition in humid soils can counteract protection

et al. 2020

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“…(2) Co-precipitation leads to the formation of secondary mineral phases in the presence of OM. The size of these mineral phases ranges from one to a few dozen nanometers (Tamrat et al, 2018;Eusterhues et al, 2008;Levard et al, 2012;Rasmussen et al, 2018;Mikutta et al, 2006;Kleber et al, 2015;Torn et al, 1997;Tamrat et al, 2019). Allophanes, Fe and Al oxyhydroxides and chelates (organic ligands associated with a Fe or Al metal cation) are the most commonly described mineral phases.…”

Section: Organomineral Interactionsmentioning

confidence: 99%

“…Allophanes, Fe and Al oxyhydroxides and chelates (organic ligands associated with a Fe or Al metal cation) are the most commonly described mineral phases. A molecular structure of nano-sized coprecipitates of inorganic oligomers with organic compounds has also been recently proposed (Tamrat et al, 2019). Poorly crystallized mineral phases can also be destructured by the action of organic ligands secreted by roots.…”

Section: Organomineral Interactionsmentioning

confidence: 99%

Reviews and syntheses: The mechanisms underlying carbon storage in soil

Basile‐Doelsch¹,

Balesdent²,

Pellerin³

2020

Preprint

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Abstract. Scientific research in the 21st century has considerably improved our knowledge of soil organic matter and its dynamics, particularly under the pressure of the global disruption of the carbon cycle. This paper reviews the processes that control C dynamics in soil, the representation of these processes over time, and their dependence on variations in major biotic and abiotic factors. The most recent advances in soil organic matter knowledge are: – Most organic matter is composed of small molecules, derived from living organisms, without transformation via additional abiotic organic polymerization. – Microbial compounds are predominant in the long term. – Primary belowground production contributes more to organic matter than aboveground inputs. – Contribution of less biodegradable compounds to soil organic matter is low in the long term. – Two major factors determine the soil organic carbon production yield from the initial substrates: the yield of carbon used by microorganisms and the association with minerals, particularly poorly crystallized minerals, which stabilize microbial compounds. – Interactions between plants and microorganisms and between microbial communities affect or even regulate carbon residence times, and therefore carbon stocks. Farming practices therefore affect soil C stocks not only through carbon inputs but also via their effect on microbial and organomineral interactions.

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“…Oxidation of DOM was accompanied by a reduction of SO4 2− , both of which were consumed dramatically, especially at lake inlets (SO4 2− and DOC, R 2 = 0.98, p ≤ 0.01), which indicated that gathering of sulfate-reducing bacteria contributed greatly to DOM decomposition [33,36]. Metals were liberated during the aforementioned degrading processes of particulate organic matter (total metals and the ratio of Ca/Mg and Sr/Mg, R 2 = 0.83, p ≤ 0.01) and SO4 2− was also utilized as electron acceptor, and this part of particulate organic carbon (POC) was defined as mineralassociated organic carbon [37,38]. Sr was recognized to be released from congruent dissolution of Mg-calcite and strontium probably represents a minor impurity in calcite crystal lattice [7,15].…”

Section: Surface and Underlying Watermentioning

confidence: 99%

“…Metals were liberated during the aforementioned degrading processes of particulate organic matter (total metals and the ratio of Ca/Mg and Sr/Mg, R 2 = 0.83, p ≤ 0.01) and SO 4 2− was also utilized as electron acceptor, and this part of particulate organic carbon (POC) was defined as mineral-associated organic carbon [37,38]. Sr was recognized to be released from congruent dissolution of Mg-calcite and strontium probably represents a minor impurity in calcite crystal lattice [7,15].…”

Section: Surface and Underlying Watermentioning

confidence: 99%

Spatial Variations of Trace Metals and Their Complexation Behavior with DOM in the Water of Dianchi Lake, China

Xiao

Mostofa

et al. 2019

IJERPH

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The dynamics of trace metals and the complexation behavior related to organic matter in the interface between water and sediment would influence water quality and evolution in the lake system. This study characterized the distribution of trace metals and the optical properties of dissolved organic matter (DOM) on the surface, and the underlying and pore water of Dianchi Lake (DC) to understand the origin of metals and complexation mechanisms to DOM. Some species of trace metals were detected and Al, Ti, Fe, Zn, Sr and Ba were found to be the main types of metals in the aquatic environment of DC. Ti, Fe, Sr and Ba predominated in water above the depositional layer. Al, Ti, Fe and Sr were the most abundant metallic types in pore water. Mn and Zn were the main type found at the southern lake site, reflecting the contribution of pollution from an inflowing river. The correlations between DOM and metals suggested that both originated from the major source as particulate organic matter (POM), associated with weathering of Ca-, Mg-carbonate detritus and Fe- or Mn-bearing minerals. High dynamics of DOM and hydrochemical conditions would change most metal contents and speciation in different water compartments. Proportions of trace metals in dissolved organic carbon (DOC) in natural waters were correlated with both DOM molecular weight and structure, different metals were regulated by different organic properties, and the same metal also had specific binding characteristic with DOM in various water compartments. This study highlighted the interrelation of DOM and metals, as well as the pivotal role that organic matter and nutrients played during input, migrations and transformations of metals, thereby reflecting water quality evolution in the lake systems.

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Soil organo-mineral associations formed by co-precipitation of Fe, Si and Al in presence of organic ligands

Cited by 68 publications

References 72 publications

Iron-mediated organic matter decomposition in humid soils can counteract protection

Iron-mediated organic matter decomposition in humid soils can counteract protection

Reviews and syntheses: The mechanisms underlying carbon storage in soil

Spatial Variations of Trace Metals and Their Complexation Behavior with DOM in the Water of Dianchi Lake, China

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