Soil Organic Matter of Suggested Spodic Horizons in Relic Ornithogenic Soils of Coastal Continental Antarctica (Casey Station, Wilkes Land) in Comparison With That of Spodic Soil Horizons in Germany

Beyer, L.; Knicker, Heike; Blume, Hans‐Peter; Bölter, Manfred; Vogt, B.; Schneider, D.

doi:10.1097/00010694-199707000-00007

Cited by 37 publications

(23 citation statements)

References 17 publications

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“…White et al (2007) used pyrolysis GC-MS to examine 19 soils collected from a variety of circumpolar regions and found that these soils were carbohydrate rich. Solid-state 13 C NMR characterization studies of soil OM from the Arctic, Antarctic, and northern alpine regions have collectively reported that alkyl and O-alkyl structures dominated the NMR spectra (Beyer et al, 1995(Beyer et al, , 1997(Beyer et al, , 2001Dai et al, 2001Dai et al, , 2002Sjögersten et al, 2003;Pautler et al, 2010;Pedersen et al, 2011). These studies provide the underlying basis for concern since labile OM constituents (i.e., O-alkyl components) are particularly susceptible to climate change.…”

Section: Soil Organic Matter Structural Shifts With Soil Warmingmentioning

confidence: 99%

The Chemical Ecology of Soil Organic Matter Molecular Constituents

Simpson

2012

J Chem Ecol

121

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Soil organic matter (OM) contains vast stores of carbon, and directly supports microbial, plant, and animal life by retaining essential nutrients and water in the soil. Soil OM plays important roles in biological, chemical, and physical processes within the soil, and arguably plays a major role in maintaining long-term ecological stability in a changing world. Despite its importance, there is a great deal still unknown about soil OM chemical ecology. The development of sophisticated analytical methods have reshaped our understanding of soil OM composition, which is now believed to be comprised of plant and microbial products at various stages of decomposition. The methods also have recently been applied to study environmental change in various settings and have provided unique insight with respect to soil OM chemical ecology. The goal of this review is to highlight the methods used to characterize soil OM structure, source, and degradation that have enabled precise observations of OM and associated ecological shifts. Although the chemistry of soil OM is important in its overall fate in ecosystems, the studies conducted to date suggest that ecological function is not defined by soil OM chemistry alone. The long-standing questions regarding soil OM stability and recalcitrance will likely be answered when several molecular methods are used in tandem to closely examine structure, source, age, degradation stage, and interactions of specific OM components in soil.

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Section: Soil Organic Matter Structural Shifts With Soil Warmingmentioning

confidence: 99%

The Chemical Ecology of Soil Organic Matter Molecular Constituents

Simpson

2012

J Chem Ecol

121

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“…The chemical shifts are given relative to nitromethane (=0 ppm). Peak assignments were taken from earlier references (Clinton et al 1995;Knicker et al 1996;Beyer et al 1997;Mahieu et al 2000). Actual spectral boundaries used for peak area determination were the natural 'valleys' closest to the indicated chemical shift values.…”

Section: Cross-polarization Magic Angle Spinning (Cp/mas) 15 N-nmrmentioning

confidence: 99%

Nitrogen Incorporation into Lignite Humic Acids during Microbial Degradation

Dong

Yuan

2009

Geomicrobiology Journal

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Previous study showed that nitrogen content in lignite humic acids (HA) increased significantly during lignite biodegradation. In this paper we evaluated the factors responsible for the increased level of N in HA and the formation of new nitrogen compound following microbial degradation. When the ammonium sulfate concentration in lignite medium was <0.5%, the N-content in HA was higher than that in the crude lignite humic acid (cHA); when the ammonium sulfate concentration was ≥0.5%, both the biodegraded humic acid (bHA) N-content and the content of bHA in lignite increased significantly, but at 2.0% no increase was observed. This indicated that HA incorporated N existing in the lignite medium, and more HA can incorporate more N with the increase of bHA amount in lignite during microbial degradation. CP/MAS 15 N NMR analysis showed that the N incorporated into HA during biotransformation was in the form of free or ionized NH 2 -groups in amino acids and sugars, as well as NH + 4 . We propose nitrogen can be incorporated into HA biotically and abiotically. The high N content bHA has a potential application in agriculture since N is essential for plant growth.

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“…Spodosols are the unique order of soils that present clear evidence of elluviation and illuviation of organic matter (OM) throughout the profile (Soil Survey Staff, 1999). These soils occur worldwide from boreal to tropical climates (Ugolini et al, 1987;Blume et al, 1996;Beyer et al, 1997;Stützer, 1999;Lundström et al, 2000a,b). In cold climates podzols occur as zonal soils and can develop on many different types of rocks, whereas in tropical regions intrazonal podzols occur in lowlands on poor parent material such as quartz-rich sandy coastal plain sediments or on quartzitic rocks at various altitudes.…”

Section: Introductionmentioning

confidence: 99%