Characterization of organic matter in a northern hardwood forest soil by 13C NMR spectroscopy and chemical methods

Ussiri, David A.N.; Johnson, Chris

doi:10.1016/s0016-7061(02)00257-4

Cited by 184 publications

(121 citation statements)

References 41 publications

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“…In the forested wetland and upland forest sites where organic horizons overlay mineral soils, the fulvic-like component 4 contributes greater to DOM Xuorescence than in the bog and the humic-like to fulvic-like ratio is less than 3. This Wnding corroborates previous research in a northern hardwood forest showing that humic acids dominate the surface organic horizons and decrease with depth in the soil proWle until the more mobile fulvic acids eventually became the dominant fraction in the lower horizons (Ussiri and Johnson 2003). Another possible reason for the greater fulvic acid content in the upland forest and forested wetland is the potential for lateral transport of DOM downslope through the soil, which has been suggested to occur in forested histosols of southeast Alaska (D'Amore and Lynn 2002).…”

Section: Indicators Of Biodegradable Docsupporting

confidence: 91%

“…This Wnding indicates that the humic-like component 1 has a greater N content, which is consistent with the lower C:N ratios of extractable humic acids in comparison to fulvic acids (Ussiri and Johnson 2003;Gondar et al 2005). Even though the contribution of DOM Xuorescence to the total pool of DOM is still unknown, DOC:DON analysis reveals components 1 and 4 of our PARAFAC model resemble humic and fulvic acids extracted from soils.…”

Section: Indicators Of Biodegradable Docsupporting

confidence: 79%

“…Another possible reason for the greater fulvic acid content in the upland forest and forested wetland is the potential for lateral transport of DOM downslope through the soil, which has been suggested to occur in forested histosols of southeast Alaska (D'Amore and Lynn 2002). This type of water movement would most likely transport fulvicrich DOM because humic acids usually precipitate out and accumulate in organic horizons and fulvic acids tend to remain soluble and move downward with percolating water (Ussiri and Johnson 2003).…”

Section: Indicators Of Biodegradable Docmentioning

confidence: 99%

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Fluorescence characteristics and biodegradability of dissolved organic matter in forest and wetland soils from coastal temperate watersheds in southeast Alaska

et al. 2008

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Understanding how the concentration and chemical quality of dissolved organic matter (DOM) varies in soils is critical because DOM inXuences an array of biological, chemical, and physical processes. We used PARAFAC modeling of excitation-emission Xuorescence spectroscopy, speciWc UV absorbance (SUVA 254 ) and biodegradable dissolved organic carbon (BDOC) incubations to investigate the chemical quality of DOM in soil water collected from 25 cm piezometers in four diVerent wetland and forest soils: bog, forested wetland, fen and upland forest. There were signiWcant diVerences in soil solution concentrations of dissolved organic C, N, and P, DOC:DON ratios, SUVA 254 and BDOC among the four soil types. Throughout the sampling period, average DOC concentrations in the four soil types ranged from 9-32 mg C l ¡1 and between 23-42% of the DOC was biodegradable. Seasonal patterns in dissolved nutrient concentrations and BDOC were observed in the three wetland types suggesting strong biotic controls over DOM concentrations in wetland soils. PARAFAC modeling of excitation-emission Xuorescence spectroscopy showed that protein-like Xuorescence was positively correlated (r 2 = 0.82; P < 0.001) with BDOC for all soil types taken together. This Wnding indicates that PARAFAC modeling may substantially improve the ability to predict BDOC in natural environments. Coincident measurements of DOM concentrations, BDOC and PARA-FAC modeling conWrmed that the four soil types contain DOM with distinct chemical properties and have unique Xuorescent Wngerprints. DOM inputs to streams from the four soil types therefore have the potential to alter stream biogeochemical processes diVerently by inXuencing temporal patterns in stream heterotrophic productivity.

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Section: Indicators Of Biodegradable Docsupporting

confidence: 91%

Section: Indicators Of Biodegradable Docsupporting

confidence: 79%

Section: Indicators Of Biodegradable Docmentioning

confidence: 99%

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Fluorescence characteristics and biodegradability of dissolved organic matter in forest and wetland soils from coastal temperate watersheds in southeast Alaska

et al. 2008

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“…The decrease of this area (Table 2) during the anaerobic digestion agrees with fiber analyses data and confirmed that the process proceeded mainly through the degradation of carbohydrate-like molecules. As a consequence of this, the aromatic-C (113-160 ppm) and above all long chain aliphatic-C (28-47 ppm) contents increased due to their recalcitrant nature (Pichler et al, 2001;Ussiri and Johnson, 2003). The increase of the area at 160-210 ppm (carboxyl group of the aliphatic chain) confirms this trend.…”

Section: C Cpmas Nmr Analysismentioning

confidence: 55%

“…polysaccharides) (Kögel-Knabner, 2002) (47-113 ppm); (iv) aromatic carbon (e.g. lignin) (Ussiri and Johnson, 2003) (113-160 ppm) and (v) carbonyl carbon in aliphatic esters, carboxyl groups and amide carboxyl (160-210 ppm).…”

Section: C Cpmas Nmr Analysismentioning

confidence: 99%

Assessing amendment properties of digestate by studying the organic matter composition and the degree of biological stability during the anaerobic digestion of the organic fraction of MSW

Tambone

Genevini

D’Imporzano

et al. 2009

Bioresource Technology

280

109

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a b s t r a c tThe transformation of organic matter during anaerobic digestion of mixtures of energetic crops, cow slurry, agro-industrial waste and organic fraction of municipal solid waste (OFMSW) was studied by analysing different samples at diverse points during the anaerobic digestion process in a full-scale plant. Both chemical (fiber analysis) and spectroscopic approaches ( 13 C CPMAS NMR) indicated the anaerobic digestion process proceeded by degradation of more labile fraction (e.g. carbohydrate-like molecules) and concentration of more recalcitrant molecules (lignin and non-hydrolysable lipids). These modifications determined a higher degree of biological stability of digestate with respect to the starting mixture, as suggested, also, by the good correlations found between the cumulative oxygen uptake (OD 20 ), and the sum of (cellulose + hemicellulose + cell soluble) contents of biomasses detected by fiber analysis (r = 0.99; P < 0.05), and both O-alkyl-C (r = 0.98; P < 0.05) and alkyl-C (r = À0.99; P < 0.05) measured by 13 C CPMAS NMR.

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The effective oxidation state of a peatland

et al. 2016

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract The oxidative ratio (OR) of the organic matter of the terrestrial biosphere is a key parameter in the understanding of the magnitude of the carbon sink represented both by the terrestrial biosphere and by the global oceans. However, no study has considered the oxidation state of all the organic pools and fluxes within one environment. In this study all organic matter pathways (dissolved organic matter, particulate organic matter, CO 2 , and CH 4 ) were measured within an upland peat ecosystem in northern England. The study showed the following: (1) The peat soil of ecosystem was accumulating oxygen at a rate of between À16 and À73 t O km À2 yr À1 ; (2) Although there was no significant variation in oxidation state in the peat profile, there was a significant increase in degree of unsaturation with depth; (3) The dissolved organic matter leaving the ecosystem was significantly more oxidized than the other carbon pools analyzed while the particulate organic matter was not significantly different from the peat soil profile; and (4) Assuming that all carbon flux from the site was as CO 2 , the OR of the ecosystem was 1.07; when the nature and speciation of the release pathways were considered, the ecosystem OR was 1.04. At the global scale, correcting for the speciation of carbon fluxes means that the annual global fluxes of carbon to land = 1.49 ± 0.003 Gt C/yr and to the oceans = 2.01 ± 0.004 Gt C/yr.

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Characterization of organic matter in a northern hardwood forest soil by 13C NMR spectroscopy and chemical methods

Cited by 184 publications

References 41 publications

Fluorescence characteristics and biodegradability of dissolved organic matter in forest and wetland soils from coastal temperate watersheds in southeast Alaska

Fluorescence characteristics and biodegradability of dissolved organic matter in forest and wetland soils from coastal temperate watersheds in southeast Alaska

Assessing amendment properties of digestate by studying the organic matter composition and the degree of biological stability during the anaerobic digestion of the organic fraction of MSW

The effective oxidation state of a peatland

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