Use of Thermogravimetry–Differential Scanning Calorimetry to Characterize Modelable Soil Organic Matter Fractions

López-Capél, Elisa; Sohi, Saran; Gaunt, J. L.; Manning, David

doi:10.2136/sssaj2005.0930

Cited by 141 publications

(139 citation statements)

References 22 publications

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“…Observed DSC patterns (Figs. 7 and 8) were consistent with previously published results (e.g., Lopez-Capel et al 2005b;Plante et al 2005), and consisted of an endothermic region between ambient temperature and 1508C due to the release of water, and an exothermic region between 180 and 6008C comprised of two or three more-or-less distinct peaks due to the oxidation of organic matter. A small endothermic peak near 5738C is due to the a-b inversion of quartz (Barwood and Hajek 1979).…”

Section: Thermal Analysessupporting

confidence: 92%

“…Different patterns in the DSC thermograms suggest the presence of organic matter with different composition, quality or stability (De la Rosa et al 2008;Lopez-Capel et al 2005b;Plante et al 2005). Previous studies have reported thermogravimetric mass losses of labile organic matter (between 180 and 3808C), recalcitrant organic matter (between 380 and 4758C), and refractory organic matter (including black C, between 475 and 6508C) (De la Rosa et al 2008).…”

Section: Thermal and Elemental Analysesmentioning

confidence: 99%

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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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Section: Thermal Analysessupporting

confidence: 92%

Section: Thermal and Elemental Analysesmentioning

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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“…Grisi et al, 1998;Dell'Abate et al, 2002Lopez-Capel et al, 2005;Plante et al, 2005;Fernandez et al, 2008). However, there is a lack of knowledge about the relationship between biochemical and thermal stability (reviewed by Plante et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Effect of peat quality on microbial greenhouse gas formation in an acidic fen

2010

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Abstract.Peatlands play an important role in the global carbon cycle and represent both an important stock of soil carbon and a substantial natural source of relevant greenhouse gases like CO 2 and CH 4 . While it is known that the quality of organic matter affects microbial degradation and mineralization processes in peatlands, the manner in which the quality of peat organic matter affects the formation of CO 2 and CH 4 remains unclear. In this study we developed a fast and simple peat quality index in order to estimate its potential greenhouse gas formation by linking the thermo-degradability of peat with potential anaerobic CO 2 and CH 4 formation rates. Peat samples were obtained at several depths (0-40 cm) at four sampling locations from an acidic fen (pH∼4.7). CO 2 and CH 4 formation rates were highly spatially variable and depended on depth, sampling location, and the composition of pyrolysable organic matter. Peat samples active in CO 2 and CH 4 formation had a quality index above 1.35, and the fraction of thermally labile pyrolyzable organic matter (comparable to easily available carbon substrates for microbial activity) obtained by thermogravimetry was above 35%. Curie-point pyrolysis-gas chromatography/mass spectrometry mainly identified carbohydrates and lignin as pyrolysis products in these samples, indicating that undecomposed organic matter was found in this fraction. In contrast, lipids and unspecific pyrolysis products, which indicate recalcitrant and highly decomposed organic matter, correlated significantly with lower CO 2 formation and reduced methanogenesis. Our results suggest that undecomposed organic matter is a prerequisite for CH 4 and CO 2 development in acidic fens. Furthermore, the new peat quality index should aide the estimation of potential greenhouse gas formation resulting from peatland restoration and permafrost thawing and help yield more robust models of trace gas fluxes from peatlands for climate change research.

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“…Leifeld (jens.leifeld@art.admin.ch) contrasting agricultural land-use, Lopez-Capel et al (2005) showed that free and intra-aggregate light fractions of soil organic matter (SOM) are characterized by typical thermal responses and that thermal and chemical attributes of the organic matter were correlated. Also clay fractions in chronosequences from native forest to long-term bare fallow differed in their thermal stability and the bare fallow was relatively enriched in stable organic matter (Plante et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Thermal stability responses of soil organic matter to long-term fertilization practices

2006

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Abstract. We used differential scanning calorimetry (DSC) to infer thermal properties of soil organic matter (SOM) in the static fertilization experiment in Bad Lauchstädt, Germany, which has been established in 1902. Four treatments (null N, change from null to manuring in 1978 NM, change from manuring to null in 1978 MN, and permanent manure and mineral fertilization since 1902 M) were sampled in 2004. Soil organic carbon contents were highest for M (2.4%), lowest for N (1.7%), and similar for MN and NM (2.2%). Three heat flow peaks at around 354 • C, 430 • C, and 520 • C, which were assigned to as thermally labile and stable SOM and combustion residues from lignite, respectively, characterized DSC thermograms. DSC peak temperatures were relatively constant among treatments, but peak heights normalized to the organic C content of the soil were significantly different for labile and stable SOM. Labile C was higher for M>MN=NM=N, and stable C decreased in the order N=NM>MN=M, showing that agricultural depletion of SOM increases the share of thermally stable C. Lignitederived C was not affected by management, suggesting a homogeneous deposition across treatments.

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Use of Thermogravimetry–Differential Scanning Calorimetry to Characterize Modelable Soil Organic Matter Fractions

Cited by 141 publications

References 22 publications

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

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

Effect of peat quality on microbial greenhouse gas formation in an acidic fen

Thermal stability responses of soil organic matter to long-term fertilization practices

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