Mineral control of carbon pools in a volcanic soil horizon

Basile‐Doelsch, Isabelle; Amundson, Ronald; Stone, William E.; Borschneck, Daniel; Bottero, Jean-Yves; Moustier, S.; Masin, Francis; Colin, F.

doi:10.1016/j.geoderma.2006.10.006

Cited by 130 publications

(102 citation statements)

References 60 publications

(104 reference statements)

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“…GIT on Fig. 6) could reflect local enrichment in organic matter as supported by their low δ 13 C signature (Basile-Doelsch et al, 2007;de Junet et al, 2013 ). On another side, high soil CO 2 fluxes defining a wide zone is more prone to track a real magmatic contribution, the δ 13 C signature being affected by secondary processes.…”

Section: Significance Of the Co 2 Anomaliesmentioning

confidence: 93%

“…This peculiar condition is explicable, most probably, by the tropical oceanic climate, which is marked by extreme precipitation rates and a high average temperature, allowing substratum degradation and fast vegetation development. Some authors (Basile-Doelsch et al, 2007;de Junet et al, 2013) have evidenced that andosols at La Réunion Island have a strong potential organic matter sequestration due to the absence of aluminosilicate minerals. However, recent studies carried out on the whole edifice have revealed that at Piton de la Fournaise there are also several sites marked by high soil CO 2 fluxes with a δ 13 C signature typical of a magmatic origin of the emitted gas.…”

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confidence: 99%

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Investigating the deepest part of a volcano plumbing system: Evidence for an active magma path below the western flank of Piton de la Fournaise (La Réunion Island)

Boudoire

Liuzzo

Muro

et al. 2017

Journal of Volcanology and Geothermal Research

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Peripheral diffuse degassing of CO 2 from the soil occurs across the western flank of Piton de la Fournaise volcano (La Réunion Island, Indian Ocean) along a narrow zone. In this area, carbon isotopic analysis on soil gas samples highlights significant mixing between magmatic and organic end-members. The zones with the strongest magmatic signature (highest δ 13 C) overlap spatial distribution of hypocenters recorded shortly before and during volcano reactivation and allow discriminating a N135° degassing lineament, with a minimum length of 11 km and 140 ± 20 m-width. Such orientation is in accordance with that of an old dyke network along the rift zone and with N120-130° and N140-155° lineaments related to the inheritance of oceanic lithosphere structures. Our findings show that this N135° lineament represents a preferential magmatic pathway for deep magma transfer below the volcano flank. Moreover, spatial distributions of recent eccentric cones indicate a well-founded possibility that future eruptions may by-pass the shallow plumbing system of the central area of the volcano, taking a lateral pathway along this structure. Our results also confirm that Piton de la Fournaise activity is linked to a laterally shifted plumbing system and represent a major improvement in identifying the main high-risk area on the densely populated western flank of the volcano.

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Section: Significance Of the Co 2 Anomaliesmentioning

confidence: 93%

mentioning

confidence: 99%

Investigating the deepest part of a volcano plumbing system: Evidence for an active magma path below the western flank of Piton de la Fournaise (La Réunion Island)

Boudoire

Liuzzo

Muro

et al. 2017

Journal of Volcanology and Geothermal Research

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“…Recent examples include the study of mineral-specific associations with organic matter and mineral-specific bonding mechanisms (e.g. Basile-Doelsch et al, 2007. PDF is the best method available to separate POM from mineral-associated OM.…”

Section: Moni Et Al: Density Fractions Versus Size Separatesmentioning

confidence: 99%

Density fractions versus size separates: does physical fractionation isolate functional soil compartments?

et al. 2012

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Abstract. Physical fractionation is a widely used methodology to study soil organic matter (SOM) dynamics, but concerns have been raised that the available fractionation methods do not well describe functional SOM pools. In this study we explore whether physical fractionation techniques isolate soil compartments in a meaningful and functionally relevant way for the investigation of litter-derived nitrogen dynamics at the decadal timescale. We do so by performing aggregate density fractionation (ADF) and particle size-density fractionation (PSDF) on mineral soil samples from two European beech forests a decade after application of 15 N labelled litter.Both density and size-based fractionation methods suggested that litter-derived nitrogen became increasingly associated with the mineral phase as decomposition progressed, within aggregates and onto mineral surfaces. However, scientists investigating specific aspects of litter-derived nitrogen dynamics are pointed towards ADF when adsorption and aggregation processes are of interest, whereas PSDF is the superior tool to research the fate of particulate organic matter (POM).Some methodological caveats were observed mainly for the PSDF procedure, the most important one being that fine fractions isolated after sonication can not be linked to any defined decomposition pathway or protective mechanism. This also implies that historical assumptions about the "adsorbed" state of carbon associated with fine fractions need to be reevaluated. Finally, this work demonstrates that establishing a comprehensive picture of whole soil OM dynamics requires a combination of both methodologies and we offer a suggestion for an efficient combination of the density and size-based approaches.

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“…Mass recoveries greater than 100% suggest that some SPT contamination might have occurred due to incomplete rinsing (Basile-Doelsch et al 2007). Variability among replicates was small in the Breton samples, but more significant in the Ellerslie samples (Fig.…”

Section: Mass and C Distributions In Density Fractionsmentioning

confidence: 99%

“…Sequential density fractionation (SDF) has been demonstrated to be useful for identifying mechanisms of organo-mineral interactions and quantifying pools of organic matter with different ecological roles that are relevant to soil organic matter research (Crow et al 2007;Swanston et al 2005). Several authors have applied SDF techniques to different soils (Baisden et al 2002;Basile-Doelsch et al 2007;Shang and Tiessen 2001;Sollins et al 2006) using different heavy liquids and density cut-offs. The method is based on the lesser density of the organic phase of the soil in comparison with the mineral phase (Sollins et al 2006), which implies that organo-mineral mixtures richer in organic materials are lighter than the organic matter-poor heavier ones.…”

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confidence: 99%

Pedogenic, mineralogical and land-use controls on organic carbon stabilization in two contrasting soils

Plante¹,

Virto²,

Malhi³

2010

Can. J. Soil. Sci.

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S. S. 2010. Pedogenic, mineralogical and land-use controls on organic carbon stabilization in two contrasting soils. Can. J. Soil Sci. 90: 15Á26. Organo-mineral complexation in soils is strongly controlled by pedogenesis, but the mechanisms controlling it and its interaction with cultivation are not yet well understood. We compared the mineralogy and quality of organic carbon (C) among organo-mineral fractions from two soils with contrasting pedogenic origin. Sequential density fractionation (SDF; using 1.6, 1.8, 2.1, 2.4 and 2.6 g mL(1 sodium polytungstate solutions) followed by thermal analysis was applied to a Chernozem from Ellerslie, Alberta, and a Luvisol from Breton, Alberta, each under native and cultivated land uses. Similar clay mineralogy suggested that pedogenic controls on organic C stabilization were related to long-term vegetation cover. In addition to large differences in total organic C quantities, bulk soil and isolated fractions showed significant differences in organic C quality. Samples under native vegetation revealed greater organo-mineral complexation at Ellerslie compared with Breton, as expressed by less solubilisation, more organic C recovered in intermediate-density fractions, and exothermic differential scanning calorimetry peak signals associated with more stable forms of organic C. Long-term cultivation resulted in an overall shift to more stable organo-mineral complexes. The proportion of soil C in the 2.1Á2.4 g mL(1 fraction increased under cultivation from 21 to 32% in Breton samples, and from 6 to 16% in Ellerslie samples. The quality of inherited pedogenic soil organic C stored in a soil thus appears to determine its response to long-term cultivation.Key words: Cultivation, sequential density fractionation, organic carbon, organic matter, thermal analysis Plante, A. F., Virto, I. et Malhi, S. S. 2010. Controˆle de la stabilisation du carbone organique dans deux sols contrastants par la pe´dogene`se, la mine´ralogie et l'exploitation des terres. Can. J. Soil Sci. 90: 15Á26. La cre´ation de complexes organomine´raux dans les sols est largement re´gie par la pe´dogene`se, mais on comprend mal les me´canismes qui la commandent et ses interactions avec l'agriculture. Les auteurs ont compare´la mine´ralogie et la qualite´du carbone organique (C) dans les fractions organo-mine´rales de deux sols d'origine contrastante. Pour cela, ils ont applique´le fractionnement par gradient de densite´(avec des solutions renfermant 1,6, 1,8, 2,1, 2,4 et 2,6 g de polytungstate de sodium par mL) puis l'analyse thermique a`un tchernoziom d'Ellerslie (Alberta) et a`un luvisol de Breton (Alberta), a`l'e´tat naturel et cultive´, dans chaque cas. Une mine´ralogie similaire de l'argile laisse croire que le controˆle exerce´par la pe´dogene`se sur la stabilisation du C organique est associe´a`une couverture ve´ge´tale prolonge´e. Outre les importantes variations au niveau de la concentration totale de C organique, le sol brut et les fractions qui en ont e´te´isole´es pre´sentent des e´carts sensibles au ni...

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Mineral control of carbon pools in a volcanic soil horizon

Cited by 130 publications

References 60 publications

Investigating the deepest part of a volcano plumbing system: Evidence for an active magma path below the western flank of Piton de la Fournaise (La Réunion Island)

Investigating the deepest part of a volcano plumbing system: Evidence for an active magma path below the western flank of Piton de la Fournaise (La Réunion Island)

Density fractions versus size separates: does physical fractionation isolate functional soil compartments?

Pedogenic, mineralogical and land-use controls on organic carbon stabilization in two contrasting soils

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