The Mineralization of Nitrogen and Sulphur From Particle-Size Separates of Gleysolic Soils

Lowe, L. E.; Hinds, A. A.

doi:10.4141/cjss83-079

Cited by 24 publications

(6 citation statements)

References 4 publications

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“…Possibly surfaces of the silt particles represent hotspots for nitrification. Several studies have reported a correlation between N-mineralisation and smaller sized particles (Chichester, 1969 , 1970 ; Cameron and Posner, 1979 ; Lowe and Hinds, 1983 ; Catroux and Schnitzer, 1987 ), but Nacro et al ( 1996 ) suggested that most nitrifying organisms in a tropical soil reside in coarser fractions. Ammonification providing the substrate for nitrification was found to be located mainly in the finer fractions (Nacro et al, 1996 ; Bimüller et al, 2014 ).…”

Section: Discussionmentioning

confidence: 99%

Bacterial Preferences for Specific Soil Particle Size Fractions Revealed by Community Analyses

et al. 2018

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Genetic fingerprinting demonstrated in previous studies that differently sized soil particle fractions (PSFs; clay, silt, and sand with particulate organic matter (POM)) harbor microbial communities that differ in structure, functional potentials and sensitivity to environmental conditions. To elucidate whether specific bacterial or archaeal taxa exhibit preference for specific PSFs, we examined the diversity of PCR-amplified 16S rRNA genes by high-throughput sequencing using total DNA extracted from three long-term fertilization variants (unfertilized, fertilized with minerals, and fertilized with animal manure) of an agricultural loamy sand soil and their PSFs. The PSFs were obtained by gentle ultrasonic dispersion, wet sieving, and centrifugation. The abundance of bacterial taxa assigned to operational taxonomic units (OTUs) differed less than 2.7% between unfractionated soil and soil based on combined PSFs. Across the three soil variants, no archaeal OTUs, but many bacterial OTUs, the latter representing 34–56% of all amplicon sequences, showed significant preferences for specific PSFs. The sand-sized fraction with POM was the preferred site for members of Bacteroidetes and Alphaproteobacteria, while Gemmatimonadales preferred coarse silt, Actinobacteria and Nitrosospira fine silt, and Planctomycetales clay. Firmicutes were depleted in the sand-sized fraction. In contrast, archaea, which represented 0.8% of all 16S rRNA gene sequences, showed only little preference for specific PSFs. We conclude that differently sized soil particles represent distinct microenvironments that support specific bacterial taxa and that these preferences could strongly contribute to the spatial heterogeneity and bacterial diversity found in soils.

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Section: Discussionmentioning

confidence: 99%

Bacterial Preferences for Specific Soil Particle Size Fractions Revealed by Community Analyses

et al. 2018

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“…Christensen, 1985;Tiessen & Stewart, 1983). Organic fractions associated with different particle sizes are known to have different susceptibilities to decomposition (Cameron & Posner, 1979;Chichester, 1969;Lowe & Hinds, 1983;Tiessen & Stewart, 1983). Such differences in decomposability could be reflected in distribution of labelled and native C between fractions of different size.…”

Section: Introductionmentioning

confidence: 99%

“…Such differences in decomposability could be reflected in distribution of labelled and native C between fractions of different size. The fractionation of soil according to particle sizes has proyed to be a useful tool in the study of soil organic matter, revealing differences both in the structural and the dynamic properties of organic matter from different soils and particle size isolates (Amato & Ladd, 1980;Cheshire & Mundie, 1981;Christensen, 1985;Ladd et al, 1977;Lowe & Hinds, 1983;Tiessen & Stewart, 1983;Turchenek & Oades, 1979). The present study examines the distribution of labelled and native C between particle size fractions isolated from cultivated soils that have been incubated for several years with various 14C labelled organic substrates.…”

Section: Introductionmentioning

confidence: 99%

The distribution of native and labelled carbon between soil particle size fractions isolated from long‐term incubation experiments

Christensen

Sørensen

1985

Journal of Soil Science

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Four soils with 6, 12, 23 and 46% clay were fractionated according to particle size after incubation for 5-6 years with I4C labelled straw, hemicellulose or glucose: 6 2 3 % of the I4C was still present and the amount increased with increasing content of fine particles.Clay fractions contained 66-84% of the 14C and the silt fractions accounted for 4 1 9 % . <2% was found in the sand fractions and 4 9 % was water soluble. The distribution of the native C was: clay, 46-68%; silt, 2&31%; sand, 2-7%.The clay fractions had higher relative proportions of 14C than of native C, the reverse being true for the silt fractions. This distribution pattern was not directly related to soil clay content or to kind of organic amendment.The C enrichment factor of clay and silt fractions (per cent C in fraction/per cent C in whole soil) increased with decreasing fraction size for both native and 14C. However, clay enrichment factors were higher for I4C than for native C, whereas silt enrichment factors were lower.A soil (9% clay) that had been incubated in the field for 18 years with 14C labelled straw was also analysed. Labelled C content at sampling was 9% of the initial value. In contrast to the other soils the distribution of labelled and native C was similar in the clay and silt fractions, which contained 55% and 33% of the whole soil C, respectively.The results indicate that clay-bound organic matter may be important in mediumterm organic matter turnover, whereas silt-bound organic matter may participate in longer-term organic matter cycling.

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“…In these particle-size fractions, the composition of organic matter has been studied by wet-chemical methods, such as humic substance extractions (Anderson et al 1974;Catroux & Schnitzer 1987), fractionations of N (Chichester 1969;Schnitzer & Ivarson 1982), amino acids (Christensen & Bech-Andersen 1989) and mono-and polysaccharides (Cheshire et al 1990). Spectroscopic methods such as 13 C-NMR spectroscopy (Oades et al 1987(Oades et al , 1988Baldock et al 1992), and biological methods such as aerobic incubations (Christensen 1987;Lowe & Hinds 1983) have been applied. Observations of organomineral particle-size fractions by differential thermal analyses (DTA), thermogravimetry (TG) and Py-FIMS showed that organic substances of different thermal stability were enriched in distinct particle-size fractions during SOM formation and due to different soil management .…”

Section: Introductionmentioning

confidence: 99%

Influence of the mineral matrix on the formation and molecular composition of soil organic matter in a long-term, agricultural experiment

Schulten

Leinweber

1993

Biogeochemistry

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Abstract. The formation of soil organic matter from grass residues was studied in a 34-yearold pot experiment with grass cultivation on loamy marl using pyrolysis-field ionization mass spectrometry (Py-FIMS). For whole soils, the Py-FI mass spectra indicated clear changes in the molecular-chemical composition during SOM formation from grass residues. In particular, the enrichment of heterocyclic N-containing compounds with time was remarkable.For organomineral size fractions, even larger differences in the composition of SOM were found. The changes between the 13th and 34th experimental year are partly explained by a net transfer of phenols, lignin monomers und lignin dimers from medium silt to fine silt. Moreover, it is demonstrated that temperature-resolved Py-FIMS enables the determination of the thermal energy required for the evolution of individual compound classes which is a measure of the strength of humic-and organomineral bonds. At lower temperatures (<400 C), the enrichment of thermally less stable and/or loosely bound organic matter with cultivation time in clay and fine silt is due to carbohydrates, N-containing compounds, phenols and lignin monomers. Shifts of evolution maxima toward a higher pyrolysis temperature (> 400 °C) in clay, fine silt and medium silt are explained by a higher thermal stability of humic and/or organomineral bonds of lignin dimers, alkylaromatics and lipids, that developed during the last two decades of the experiment.

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The Mineralization of Nitrogen and Sulphur From Particle-Size Separates of Gleysolic Soils

Cited by 24 publications

References 4 publications

Bacterial Preferences for Specific Soil Particle Size Fractions Revealed by Community Analyses

Bacterial Preferences for Specific Soil Particle Size Fractions Revealed by Community Analyses

The distribution of native and labelled carbon between soil particle size fractions isolated from long‐term incubation experiments

Influence of the mineral matrix on the formation and molecular composition of soil organic matter in a long-term, agricultural experiment

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