Solid state 13C CP MAS NMR characterization of the chemical structure of terrestrial organic matter from areas with differing vegetational backgrounds

Krosshavn, M.; Bjørgum, Jon; Southon, Timothy E.; Steinnes, E.

doi:10.1007/bfb0010470

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…Krosshavn et al (1989) have postulated that vegetation background (source of organic residue) and degree of decay are important factors influencing the chemical structure of SOM, and that vegetation background is the more important of the two. The alkyl C, carboxyl C and carbonyl C structural groups were more strongly expressed, and carbohydrate and protein-like structures were lower in soil than in litter and fine roots ( lignin structures was similar in both the precursors and SOM, as was the calculated aromaticity.…”

Section: Litter and Fine Roots In Relation To The S O M On The Nativementioning

confidence: 99%

Cultivation effects on the nature of organic matter in soils and water extracts using CP/MAS 13C NMR spectroscopy

1996

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A r m a n d o S.N. L e s s a 1, D a r w i n W. A n d e r s o n 1 and B r o c k C h a t s o n 2 AbstractThe objective of this study was to examine the chemical structure of the organic matter (SOM) of Oxisols soils in slash and burn agriculture, in relation to its biological properties and soil fertility. The CP/MAS 13C technique was used to identify the main structural groups in litter and fine roots as SOM precursors; to identify the changes on the nature of the SOM upon cultivation and the proportion of labile and stable components; and to identify the nature of the organics present in water extracts (DOC).Carbohydrates were the main structural components in litter: whereas components such as carbonyl C, carboxyl C,O-alkyl C and alkyl C were more common in SOM. Phenolic C and the degree of aromaticity were similar in litter and SOM. Cultivation resulted in a small decrease in the relative proportion of carbohydrates in SOM, little change in the levels of O-alkyl C and carbonyl C, but an increase in carboxyl C, phenolic C and aromaticity of the SOM. The level of alkyl C in soil was higher than the level of O-alkyl C, indicating the importance of long-chain aliphatics along with lignins in the stabilization of the SOM in Oxisols. The SOM of Mollisols from the Canadian Prairies differed from the Oxisol, with a generally stronger expression of aromatic structures, particularly in a cultivated soil in relation to a native equivalent. Carbohydrate components were the predominant structures in the DOC, indicating their importance in nutrient cycling and vertical translocations in the Oxisol.

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Section: Litter and Fine Roots In Relation To The S O M On The Nativementioning

confidence: 99%

Cultivation effects on the nature of organic matter in soils and water extracts using CP/MAS 13C NMR spectroscopy

1996

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“…In this work the chemical composition of whole soil samples was studied by solid-state I3C CP MAS NMR (Preston & Ripmeester, 1982;Wilson et al, 1983;Ogner, 1985;Kogel-Knabner et al, 1988;Oades et al, 1988). The humus samples were partly selected with respect to differences in their vegetational origin, and partly with respect to variation in the degree of decomposition of the organic matter (Swift et al, 1979;Mathur & Farnham, 1985;Hatcher et al, 1986;Frund & Ludemann, 1989;Frund et al, 1989;Krosshavn et al, 1990;Ranger et al, 1990;Krosshavn et al, 1991). The results indicate a significant influence of vegetational background and degree of decomposition on the chemical composition of soil, in contrast to an earlier investigation where this relationship was assumed but not confirmed (Krosshavn et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

The influence of vegetational origin and degree of humification of organic soils on their chemical composition, determined by solid‐state ¹³C NMR

Krosshavn¹,

Southon

Steinnes³

1992

Journal of Soil Science

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SUMMARY Organic soil samples with different vegetational background and others with variation in the degree of humification, were investigated with solid‐state 13C NMR. This work indicates that the vegetational origin and degree of humification of the organic matter appear to influence the distribution of functional groups in organic soils considerably, but one year of decomposition under controlled laboratory conditions gave only small changes in the chemical composition.

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“…The purpose of this investigation was to find out whether isolation and separation of humic substances change the chemical composition of soil. Whole soil, humic acids, fulvic acids and humin were examined with solid-state I3C CP MAS NMR (Preston & Ripmeester, 1982;Ogner, 1985;Hempfling et al, 1987;Krosshavn et al, 1991). The soil samples were selected with respect to differences in their vegetational cover in order to find out whether humus fractionation affects the chemical structure of soil differently according to variation in their vegetational background (Wilson et al, 1981;Friind & Liidemann, 1989;Friind et a/., 1989;Krosshavn et al, 1990;Ranger et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

The influence of humus fractionation on the chemical composition of soil organic matter studied by solid‐state ¹³C NMR

Krosshavn¹,

Kögel‐Knabner

Southon

et al. 1992

Journal of Soil Science

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SUMMARY Four samples of soil organic matter and their humic acids, fulvic acids and humin were studied with solid‐state 13CP MAS NMR. The whole soil samples were fractionated using NaOH and HCl in order to extract humic acids, fulvic acids and humin. This investigation indicates that conventional humus fractionation does not significantly change the content of different functional groups in soil.

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Solid state 13C CP MAS NMR characterization of the chemical structure of terrestrial organic matter from areas with differing vegetational backgrounds

Cited by 5 publications

References 8 publications

Cultivation effects on the nature of organic matter in soils and water extracts using CP/MAS 13C NMR spectroscopy

Cultivation effects on the nature of organic matter in soils and water extracts using CP/MAS 13C NMR spectroscopy

The influence of vegetational origin and degree of humification of organic soils on their chemical composition, determined by solid‐state ¹³C NMR

The influence of humus fractionation on the chemical composition of soil organic matter studied by solid‐state ¹³C NMR

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Solid state 13C CP MAS NMR characterization of the chemical structure of terrestrial organic matter from areas with differing vegetational backgrounds

Cited by 5 publications

References 8 publications

Cultivation effects on the nature of organic matter in soils and water extracts using CP/MAS 13C NMR spectroscopy

Cultivation effects on the nature of organic matter in soils and water extracts using CP/MAS 13C NMR spectroscopy

The influence of vegetational origin and degree of humification of organic soils on their chemical composition, determined by solid‐state 13C NMR

The influence of humus fractionation on the chemical composition of soil organic matter studied by solid‐state 13C NMR

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The influence of vegetational origin and degree of humification of organic soils on their chemical composition, determined by solid‐state ¹³C NMR

The influence of humus fractionation on the chemical composition of soil organic matter studied by solid‐state ¹³C NMR