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Does soil organic matter in mollic horizons of central/east European floodplain soils have common chemical features?

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2021
Authors
Rennart, Tilo
Article (Published version)
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Abstract
Soils on riverine floodplains in temperate climate may be characterized by a mollic epipedon, i.e. by dark colour, enhanced content of soil organic matter (SOM), high ‘base’ saturation and developed structure in the topsoil. We studied 124 soil samples from ten central/east European countries to investigate whether SOM in mollic horizons has similar chemical features. We determined carbon contents with a thermal-gradient method to differentiate SOM with varying thermal stability, and carbonates. We characterized SOM by diffuse reflectance infrared Fourier-transform (DRIFT) spectroscopy. According to the World Reference Base for Soil Resources, 102 of the samples fulfilled all criteria of a mollic horizon. Mollic features were not restricted to the uppermost horizon but also detected in buried former surface horizons. Soil colour was mostly the criterion to exclude non-mollic samples. Mollic and adjacent non-mollic horizons contained thermostable SOM, indicating SOM stabilized by intera...ction with minerals or as black carbon (BC), to very similar extent, up to 20.4% of total soil organic carbon (SOC). However, the correlation between the contents of thermostable SOC and total SOC, the SOC:N ratios of the thermostable fraction, and the smaller extent of metal complexation of carboxyl groups, pointed to a larger contribution of BC to SOM of mollic samples than to SOM in non-mollic samples. Thus, like in mollic horizons in Chernozems and Phaeozems not affected by fluviatile dynamics, SOM in mollic horizons of floodplain soils seemed to consist of SOM affected by natural or anthropogenic fires, constituting a common chemical feature of SOM. Thus, BC may contribute to soil colour and SOM stability in mollic horizons of floodplain soils. However, apart from BC contribution, SOM in mollic horizons of floodplain soils may have further pathways of formation and development, as SOM may be inherited from deposited material or form/transform by degradative or constructive processes.

Keywords:
Fluvisol / Phaeozem / Chernozem / Black carbon / Thermal stability / DRIFT spectroscopy
Source:
CATENA, 2021, 200, 105192-
Publisher:
  • Elsevier
Funding / projects:
  • Studying climate change and its influence on environment: impacts, adaptation and mitigation (RS-43007)
  • Study of the effects of soil and irrigation water quality on more efficient agricultural crop production and environment protection (RS-37006)
Note:
  • Supplemenatry material: http://aspace.agrif.bg.ac.rs/handle/123456789/5999
Related info:
  • Referenced by
    http://aspace.agrif.bg.ac.rs/handle/123456789/5999

DOI: 10.1016/j.catena.2021.105192

ISSN: 0341-8162

WoS: 000620777400045

Scopus: 2-s2.0-85100312421
[ Google Scholar ]
URI
http://aspace.agrif.bg.ac.rs/handle/123456789/5776
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  • Radovi istraživača / Researchers’ publications
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Poljoprivredni fakultet

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