Fate of carbohydrates and lignin in north-east Siberian permafrost soils
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F18%3A43897768" target="_blank" >RIV/60076658:12310/18:43897768 - isvavai.cz</a>
Result on the web
<a href="https://reader.elsevier.com/reader/sd/pii/S0038071717300019?token=56B57B81CF83F414F0DC4C0AA2D6FA48D3DE9DB4894C1CE67EA9C7CB5710064C863CB6F034825177E1C102661A99E607" target="_blank" >https://reader.elsevier.com/reader/sd/pii/S0038071717300019?token=56B57B81CF83F414F0DC4C0AA2D6FA48D3DE9DB4894C1CE67EA9C7CB5710064C863CB6F034825177E1C102661A99E607</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.soilbio.2017.10.032" target="_blank" >10.1016/j.soilbio.2017.10.032</a>
Alternative languages
Result language
angličtina
Original language name
Fate of carbohydrates and lignin in north-east Siberian permafrost soils
Original language description
Permafrost soils preserve huge amounts of organic carbon (OC) prone to decomposition under changing climatic conditions. However, knowledge on the composition of soil organic matter (OM) and its transformation and vulnerability to decomposition in these soils is scarce. We determined neutral sugars and lignin-derived phenols, released by trifluoroacetic acid (TFA) and CuO oxidation, respectively, within plants and soil density fractions from the active layer and the upper permafrost layer at three different tundra types (shrubby grass, shrubby tussock, shrubby lichen) in the Northeast Siberian Arctic. The heavy fraction (HF; > 1.6 g mL(-1)) was characterized by a larger enrichment of microbial sugars (hexoses vs. pentoses) and more pronotmced lignin degradation (acids vs. aldehydes) as compared to the light fraction (LF; < 1.6 g mL(-1)), showing the transformation from plant residue-dominated particulate OM to a largely microbial imprint in mineral-associated OM. In contrast to temperate and tropical soils, total neutral sugar contents and galactose plus mannose to arabinose plus xylose ratios (GM/AX) decreased in the HE with soil depth, which may indicate a process of effective recycling of microbial biomass rather than utilizing old plant materials. At the same dine, lignin-derived phenols increased and the degree of oxidative decomposition of lignin decreased with soil depth, suggesting a selective preservation of lignin presumably due to anaerobiosis. As large parts of the plant-derived pentoses are incorporated in lignocelluloses and thereby protected against rapid decomposition, this might also explain the relative enrichment of pentoses with soil depth. Hence, our results show a relatively large contribution of plant derived OM, particularly in the buried topsoil and subsoil, which is stabilized by the current soil environmental conditions but may become available to decomposers if permafrost degradation promotes soil drainage and improves the soil oxygen supply.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
40104 - Soil science
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Soil Biology & Biochemistry
ISSN
0038-0717
e-ISSN
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Volume of the periodical
116
Issue of the periodical within the volume
JAN 2018
Country of publishing house
GB - UNITED KINGDOM
Number of pages
12
Pages from-to
311-322
UT code for WoS article
000419417900034
EID of the result in the Scopus database
2-s2.0-85032792657