Cross-polarization 13C NMR spectroscopy of whole soils

Barron, Peter F.; Wilson, Michael; Stephens, John F.; Cornell, Bruce; Tate, K. R.

doi:10.1038/286585a0

Cited by 38 publications

(11 citation statements)

References 10 publications

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“…The presence of both aliphatic and aromatic components is consistent with other observations on the I3C nmr spectra of fulvic acids from soil and water (Ruggiero et al, 1979;Stuermer & Payne, 1976), and the ' H nmr spectra of fulvic acids and humic acids (Ruggiero et a/., 1979(Ruggiero et a/., , 1980. I3C nmr spectra have provided similar information for humic acids in whole soils (Barron et al, 1980. From the nmr-derived percentage -COOH in the sample and the microanalytical value for %C (47.6) an approximate equivalent weight of 1 14 g per carboxyl group was calculated; this is in satisfactory agreement with the titration value of 133.…”

Section: Spectroscopic Studiessupporting

confidence: 89%

Fulvic acid studies: evidence for a polycarboxylate co‐ordination mode at soil pH

Cressey

Monk

Powell

et al. 1983

Journal of Soil Science

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The reactions of two fulvic acid samples with Cu2+ and Cd2+ have been studied by potentiometric titration (pH and ion selective electrode). The metal-uptake curves for samples initially rendered 'metal-free' by a precipitation-solvent extraction technique resemble those for citric and malic acids at soil pH (4-6.5). The presence of aliphatic and aromatic components was established by I3C nmr spectroscopy; the presence of phenolic components was inferred from pH titrations. It is shown that a polycarboxylate component (simulated by citrate) would mask reactions of phenolic components with metals in weakly acidic and neutral media. The mode of coordination between fulvic acid and metals will vary with pH and with the metal : fulvic acid ratio.

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Section: Spectroscopic Studiessupporting

confidence: 89%

Fulvic acid studies: evidence for a polycarboxylate co‐ordination mode at soil pH

Cressey

Monk

Powell

et al. 1983

Journal of Soil Science

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“…The Te Kopuru sand (35°04′S, 173°16′Ε) occurs on an early Pleistocene terrace, having been formed in wind‐blown sand over glauconitic sandstone ( Tate & Anderson 1978; Barron et al . 1980 ).…”

Section: Methodsmentioning

confidence: 99%

A ¹³C‐NMR study of the interactions of soil organic matter with aluminium and allophane in podzols

Parfitt

Yuan

Theng

1999

European J Soil Science

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Summary The stabilization of organic matter in soil by interaction with aluminium (Al) or allophane is important in maintaining soil quality, and in retarding the decomposition of soil organic matter. Complexation of Al by soil organic matter may also ameliorate Al toxicity. Here we use 13C‐NMR spectroscopy to assess the interaction of soil organic matter with both Al and allophane in two poorly drained podzols containing only trace amounts of iron. The 13C‐NMR spectrum of the subsoil of the allophane‐rich One Tree Point podzol shows an intense peak at 179 p.p.m., assigned to carbon in carboxylic acids. This peak shifts to 177 p.p.m. after removal of allophane (11% of the soil mass) by treatment with HF. We infer that the carboxyl groups in the organic matter are bonded to structural Al on the surface of allophane spherules. In the non‐allophanic Te Kopuru podzol, on the other hand, the organic matter apparently interacts with Al ions in the soil solution. This soil also has more aromatic carbon and fewer carbons in carboxyl and carbohydrate structures than the allophanic sample. There is an indication that allophane stabilizes carbohydrate groups as well as carboxyl groups.

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“…Extensive investigations with cross polarisationnuclear magnetic resonance spectroscopy have identified strong associations of 13 C carbohydrate, aliphatic, carbonyl, alkyl and Oalkyl C functional groups with clay and silt particles (Baldock et al, 1990;Barron et al, 1980;Golchin et al, 1994). Such organo-mineral complexes are the predominant control on long-term stabilisation of SOM (Kogel-Knabner et al, 2008).…”

Section: Soil Physical Properties Affecting Som Bioavailabilitymentioning

confidence: 97%

Microbial energy and matter transformation in agricultural soils

Finn

Kopittke

Dennis

et al. 2017

Soil Biology and Biochemistry

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a b s t r a c tLow bioavailability of organic carbon (C) and energy are key constraints to microbial biomass and activity. Microbial biomass, biodiversity and activity are all involved in regulating soil ecosystem services such as plant productivity, nutrient cycling and greenhouse gas emissions. A number of agricultural practices, of which tillage and fertiliser application are two examples, can increase the availability of soil organic C (SOC). Such practices often lead to reductions in soil aggregation and increases in SOC loss and greenhouse gas emissions. This review focuses on how the bioavailability of SOC and energy influence the ecology and functioning of microorganisms in agricultural soils. Firstly we consider how management practices affect the bioavailability of SOC and energy at the ecosystem level. Secondly we consider the interaction between SOC bioavailability and ecological principles that shape microbial community composition and function in agricultural systems. Lastly, we discuss and compare several examples of physiological differences that underlie how microbial species respond to C availability and management practices. We present evidence whereby management practices that increase the bioavailability of SOC alter community structure and function to favour microbial species likely to be associated with increased rates of SOC loss compared to natural ecosystems. We argue that efforts to restore stabilised, sequestered SOC stocks and improve ecosystem services in agricultural systems should be directed toward the manipulation of the microbial community composition and function to favour species associated with reduced rates of SOC loss. We conclude with several suggestions regarding where improvements in multi-disciplinary approaches concerning soil microbiology can be made to improve the sustainability of agricultural systems.

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Cross-polarization 13C NMR spectroscopy of whole soils

Cited by 38 publications

References 10 publications

Fulvic acid studies: evidence for a polycarboxylate co‐ordination mode at soil pH

Fulvic acid studies: evidence for a polycarboxylate co‐ordination mode at soil pH

A ¹³C‐NMR study of the interactions of soil organic matter with aluminium and allophane in podzols

Microbial energy and matter transformation in agricultural soils

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Cross-polarization 13C NMR spectroscopy of whole soils

Cited by 38 publications

References 10 publications

Fulvic acid studies: evidence for a polycarboxylate co‐ordination mode at soil pH

Fulvic acid studies: evidence for a polycarboxylate co‐ordination mode at soil pH

A 13C‐NMR study of the interactions of soil organic matter with aluminium and allophane in podzols

Microbial energy and matter transformation in agricultural soils

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Product

Resources

About

A ¹³C‐NMR study of the interactions of soil organic matter with aluminium and allophane in podzols