title: Stability of soil organic matter in Cryosols of the maritime Antarctic: insights from 13C NMR and electron spin resonance spectroscopy
metadata.name: dc.contributor.author
metadata.value: Abakumov, Evgeny
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Alekseev, Ivan
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2018-11-22T08:31:09Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2018-11-22T08:31:09Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2018-11-19
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/15059
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: Previously, the structure and molecular composition of the Antarctic soil organic matter (SOM) has been investigated using 13C-NMR methods, which showed that in typical organo-mineral soils the aliphatic carbon prevails over the aromatic one, owing to the non-ligniferous nature of its precursor material. In this study, the SOM was analysed from different sample areas (surface level and partially isolated supra-permafrost layer) of the tundra-barren landscape of the Fildes Peninsula, King George Island, Western Antarctica. We found that the humic acids (HAs) of the cryoturbated, buried areas had lower amounts of alkyl aromatic and protonized aromatic compounds. In contrast, the HAs from the surface layers contain less alkyl carbon components. The free-radical content was higher in the surface layers than in the buried layers due to the presence of fresh organic remnants in superficial soil samples. New data on SOM quality from these two representative Cryosols will enable a more precise assessment of SOM stabilization rate in sub-Antarctic tundras. Comparison of the 13C-NMR spectra of the HAs and the bulk SOM revealed that humification occurs in the Antarctic and results in accumulation of aromatic and carboxylic compounds and reductions in alkylic ones. This indicates that humification is one of the ways of soil organic matter stabilization.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: en
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Stability of soil organic matter in Cryosols of the maritime Antarctic: insights from 13C NMR and electron spin resonance spectroscopy
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: se-9-1329-2018.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/15059/1/se-9-1329-2018.pdf
resources.format: Adobe PDF
resources.size: 2,42 MB