Organic matter content and features related to associated mineral fractions in an acid, loamy soil

Bonnard, Pierre; Basile‐Doelsch, Isabelle; Balesdent, Jérôme; Armand, Michel; Borschneck, Daniel; Arrouays, Dominique

doi:10.1111/j.1365-2389.2012.01485.x

Cited by 16 publications

(9 citation statements)

References 36 publications

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“…Therefore, the NOLF and OLF in this study were not composed exclusively of physically uncomplexed organic matter in the sense used by Gregorich et al [30]. The recovery of ~88% of total soil mass in density fractions is similar to Basile-Doelsch et al [16] and Bonnard et al [33], but lower than Swanston et al [34] and Plante et al [35], who recovered ~100% soil mass.…”

Section: Methodological Considerationssupporting

confidence: 57%

Organo-Mineral Interactions Are More Important for Organic Matter Retention in Subsoil Than Topsoil

et al. 2020

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Decomposing crop residues contribute to soil organic matter (SOM) accrual; however, the factors driving the fate of carbon (C) and nitrogen (N) in soil fractions are still largely unknown, especially the influence of soil mineralogy and autochthonous organic matter concentration. The objectives of this work were (1) to evaluate the retention of C and N from crop residue in the form of occluded and mineral-associated SOM in topsoil (0–20 cm) and subsoil (30–70 cm) previously incubated for 51 days with 13C-15N-labelled corn residues, and (2) to explore if specific minerals preferentially control the retention of residue-derived C and N in topsoil and subsoil. We used topsoil and subsoil having similar texture and mineralogy as proxies for soils being rich (i.e., topsoil) and poor (i.e., subsoil) in autochthonous organic matter. We performed a sequential density fractionation procedure and measured residue-derived C and N in occluded and mineral-associated SOM fractions, and used X-ray diffraction analysis of soil density fractions to investigate their mineralogy. In accordance with our hypothesis, the retention of C and N from crop residue through organo-mineral interactions was greater in subsoil than topsoil. The same minerals were involved in the retention of residue-derived organic matter in topsoil and subsoil, but the residue-derived organic matter was associated with a denser fraction in the subsoil (i.e., 2.5–2.6 g cm−3) than in the topsoil (i.e., 2.3–2.5 g cm−3). In soils and soil horizons with high clay content and reactive minerals, we find that a low SOM concentration leads to the rapid stabilization of C and N from newly added crop residues.

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Section: Methodological Considerationssupporting

confidence: 57%

Organo-Mineral Interactions Are More Important for Organic Matter Retention in Subsoil Than Topsoil

et al. 2020

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“…Similarly, Bonnard et al. () used the multilayer model to explain a general trend of decreasing C/N ratios with increasing δ 13 C ratios in soil fractions of increasing density. Dümig et al.…”

Section: Application Of the Multilayer Model In Soil Science And Relamentioning

confidence: 99%

“…This concept is widely used to explain the marked decrease in the C/N ratios of soil heavy fractions after sonication (Castanha et al, 2008) or to support the enrichment of N in stable OM fractions, i.e., NaOCl-or H 2 O 2 -resistant OM and heavy density fractions (Barbera et al, 2008;Favilli et al, 2008;Zollinger et al, 2013). Similarly, Bonnard et al (2012) used the multilayer model to explain a general trend of decreasing C/N ratios with increasing δ 13 C ratios in soil fractions of increasing density. Dü mig et al (2012) applied the mutilayer model to explain the formation and properties of MOA during pedogenesis.…”

Section: Strong Adsorption Of N-containing Compounds and Enrichment Omentioning

confidence: 99%

The multilayer model of soil mineral–organic interfaces—a review

Gao

Mikutta

Jansen

et al. 2019

J. Plant Nutr. Soil Sci.

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Association of organic matter (OM) with minerals is an important pathway in the formation of stable OM in soil. While the importance of mineral-organic associations (MOA) in regulating soil carbon cycling has been rigorously demonstrated by empirical evidence, knowledge about the molecular-scale arrangement of OM at mineral surfaces is still lacking. Such knowledge is urgently needed to disentangle the mechanisms of long-term storage of soil OM. Based on indirect observations regarding the formation, composition, and structure of MOA, a conceptual multilayer model was proposed by Kleber et al. in 2007 to foster debate and help elucidating the structure and reactivity of MOA. According to this model, the associated OM at mineral surfaces is discrete and self-organized into a multilayer structure. In this review, we aim to collect and evaluate existing studies that used this model to explain biogeochemical processes at mineral-organic interfaces, and based on this, assess the applicability of the model. The multilayer model has seen extensive adoption within soil science and related fields. In general, existing studies either support the concept of a patchy distribution of adsorbed OM on mineral surfaces or advocate that OM can be coprecipitated with nanosized poorly crystalline minerals or hydrolysable metals. However, the evidence for the patchy distribution of adsorbed OM cannot support the multilayer model on its own. There is little consensus about the role of N-rich OM in forming the contact zone according to the multilayer model but surface conditioning by different classes of organic compounds appears to be an essential factor for the overall adsorption of OM. Nevertheless, large uncertainty still remains with respect to multilayer-like organization of MOA. By taking advantage of recent developments in surface analytical sciences and computational chemistry, a rigid experimental testing of the multilayer model at the molecular level is still required and awaits to be integrated into improved concepts of MOA formation and OM stabilization.

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“…The organic carbon stabilization process was also studied by Bonnard et al (2012) who analysed organo‐mineral associations using sequential density fractionation in top‐and sub‐soils sampled from a forest in Southern France. All the fractions were characterized by scanning electron microscopy, X‐ray diffraction, elemental analysis, 13 C NMR and 13 C. This specific characterization showed that carbon accumulation in organo‐mineral fractions was similar in both surface and deeper horizons and correlated with a relative enrichment in hydrophobic compounds.…”

Section: Soil Organic Matter and Carbon Interactionsmentioning

confidence: 99%