Contrasting composition of free and mineral-bound organic matter in top- and subsoil horizons of Andosols

Rumpel, Cornélia; Rodríguez-Rodríguez, A.; González‐Pérez, José Antonío; Arbelo, C. D.; Chabbi, Abad; Nunan, Naoise; González-Vila, F.J.

doi:10.1007/s00374-011-0635-4

Cited by 52 publications

(20 citation statements)

References 54 publications

(63 reference statements)

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“…This is in agreement with recent findings on the importance of microbial material for SOM formation (Miltner et al, 2012). However, the nature of OM interacting with the mineral phase may depend on soil depth, since the nature of mineral-associated OM was found to be different in topand subsoil horizons, with plant-derived compounds prevailing in topsoil and microbial material dominating in subsoil (Rumpel et al, 2012). All these findings are mainly based on statistical relationships between C and dense particles as well as Fe-and/or Al-oxides.…”

Section: Introductionsupporting

confidence: 90%

Nanoscale evidence of contrasted processes for root-derived organic matter stabilization by mineral interactions depending on soil depth

Rumpel

Baumann

Rémusat

et al. 2015

Soil Biology and Biochemistry

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Section: Introductionsupporting

confidence: 90%

Nanoscale evidence of contrasted processes for root-derived organic matter stabilization by mineral interactions depending on soil depth

Rumpel

Baumann

Rémusat

et al. 2015

Soil Biology and Biochemistry

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“…A typical observation is that the phenol contribution to SOM decreases (i) from forest floor to A horizons, (ii) with depth of the mineral soil, (iii) with decreasing soil particle size (reviewed in Thevenot et al, 2010) and (iv) with increasing density of soil fractions and hence phenols are contributing little to heavy (i.e., mineral-associated) and old soil fractions (Leifeld and Kögel-Knabner, 2005;Grünewald et al, 2006;Sollins et al, 2009;Kögel-Knabner et al, 2008;Cerli et al, 2012). Similar results are reported by studies using pyrolysis-gas chromatography-mass spectrometry (Gleixner et al, 2002;Nierop et al, 2005;Buurman et al, 2007;Grandy and Neff, 2008;Tonneijck et al, 2010;Rumpel et al, 2012) and tetramethylammonium hydroxide (TMAH) thermochemolysis (Nierop and Filley, 2007;Mason et al, 2012).…”

Section: Solid Phase Line Of Evidencesupporting

confidence: 61%

Gone or just out of sight? The apparent disappearance of aromatic litter components in soils

Klotzbücher

Kalbitz

Cerli

et al. 2016

SOIL

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Abstract. Uncertainties concerning stabilization of organic compounds in soil limit our basic understanding on soil organic matter (SOM) formation and our ability to model and manage effects of global change on SOM stocks. One controversially debated aspect is the contribution of aromatic litter components, such as lignin and tannins, to stable SOM forms. In the present opinion paper, we summarize and discuss the inconsistencies and propose research options to clear them.Lignin degradation takes place stepwise, starting with (i) depolymerization and followed by (ii) transformation of the water-soluble depolymerization products. The long-term fate of the depolymerization products and other soluble aromatics, e.g., tannins, in the mineral soils is still a mystery. Research on dissolved organic matter (DOM) composition and fluxes indicates dissolved aromatics are important precursors of stable SOM attached to mineral surfaces and persist in soils for centuries to millennia. Evidence comes from flux analyses in soil profiles, biodegradation assays, and sorption experiments. In contrast, studies on composition of mineral-associated SOM indicate the prevalence of non-aromatic microbial-derived compounds. Other studies suggest the turnover of lignin in soil can be faster than the turnover of bulk SOM. Mechanisms that can explain the apparent fast disappearance of lignin in mineral soils are, however, not yet identified.The contradictions might be explained by analytical problems. Commonly used methods probably detect only a fraction of the aromatics stored in the mineral soil. Careful data interpretation, critical assessment of analytical limitations, and combined studies on DOM and solid-phase SOM could thus be ways to unveil the issues.

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“…As active Al and Fe content rather than the climate conditions is the determining factor controlling organic matter level in volcanic soils (Matus et al , 2006; Tonneijck et al , 2010; Jansen et al , 2011), a large amount of SOM stabilized with Al p and Fe p in the topsoil (Imaya et al , 2010) and a small quantity in subsoil horizons was expected. The opposite is true for the allophane content in deep soil (Rumpel et al , 2012).…”

Section: Discussionmentioning

confidence: 99%

“…The role of SOM associated with Al and Fe oxides as a measure of chemical protection and density fractions to assess the physical protection as key factors controlling SOM stabilization in Andisols of different ecosystems need to be elucidated. Up to now, there have been few studies of SOM distribution in physical fractions throughout the soil profile (Mueller & Kögel‐Knabner, 2009, Moni et al , 2010; Rumpel et al , 2004) and even fewer of them have addressed Andisols (Huygens et al , 2005; Rumpel et al , 2012). In the present paper we hypothesize that the interaction of amorphous minerals with SOM in the top‐ and subsoil of contrasting Andisols controls the C stabilization and their distribution in different physical and chemical soil fractions.…”

Section: Introductionmentioning

confidence: 99%

Carbon distribution in top‐ and subsoil horizons of two contrasting Andisols under pasture or forest

Panichini

Matus

Mora

et al. 2012

European J Soil Science

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Volcanic ash soils display distinctive morphological, physical and chemical properties and they contain several times more organic matter than non‐volcanic soils. So far, there are few studies of soil organic matter (SOM) distribution in different chemically and physically protected carbon pools of soil horizons of volcanic soils. The aim of this study was to determine the SOM distribution (and its δ13C and δ15N composition) in different chemical and physical fractions at various depth horizons of two Andisols under pasture or rain forest in southern Chile. We used the amount of humus‐complexes (Cp) extracted with Na pyrophosphate as a measure of C stabilized by aluminum (Alp) and iron (Fep) in combination with density fractionation to separate particulate organic matter as free (fPOM), occluded (oPOM) and organic matter associated with the mineral fraction (MF). The results showed that soil SOM stock (0–40 cm) in the pasture soil was 166 Mg C ha−1 (11.7 Mg N ha−1) and in the forest soil 100 Mg C ha−1 (4.1 Mg N ha−1). The SOM variation was explained largely by the differences in Cp, Alp and Fep. About 34% of total soil C was found as Cp in both oPOM and MF in the topsoil, whereas 33–53% was found in the subsoil horizons. The oPOM fraction was more important in the forest soil and generally decreased in the subsoil where these fractions were enriched with δ13C and δ15N. Our results emphasize the importance of the humus complex and oPOM formation as the SOM stabilization mechanism in the forest Andisol, whereas under pasture organo‐mineral interaction, including the formation of humic‐metal complexes, is the most important stabilization mechanism. A conceptual model is lacking to demonstrate the major areas of uncertainty within known mechanisms and factors that explain the distribution of SOM through soil profiles in Andisols.

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Contrasting composition of free and mineral-bound organic matter in top- and subsoil horizons of Andosols

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Cited by 52 publications

References 54 publications

Nanoscale evidence of contrasted processes for root-derived organic matter stabilization by mineral interactions depending on soil depth

Nanoscale evidence of contrasted processes for root-derived organic matter stabilization by mineral interactions depending on soil depth

Gone or just out of sight? The apparent disappearance of aromatic litter components in soils

Carbon distribution in top‐ and subsoil horizons of two contrasting Andisols under pasture or forest

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