Does soil organic matter in mollic horizons of central/east European floodplain soils have common chemical features?
| Autor: | Adam Michalski, Markus Graf-Rosenfellner, Vedran Rubinić, Jarmila Čechmánková, Thilo Rennert, Luboš Borůvka, Horea Cacovean, Jörg Rinklebe, Svetlana Antić-Mladenović, Gabriela Barančíková, Viktar Bosak, Stefanie Mayer, Lenka Pavlů, Jozef Kobza, Igor Savin |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Topsoil
010504 meteorology & atmospheric sciences Soil organic matter Soil science 04 agricultural and veterinary sciences Soil carbon Thermal stability 15. Life on land Fluvisol 01 natural sciences Chernozem Black carbon Phaeozem DRIFT spectroscopy Soil water World Reference Base for Soil Resources 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | CATENA |
| Popis: | 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 interaction 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. Supplemenatry material: [http://aspace.agrif.bg.ac.rs/handle/123456789/5999] |
| Databáze: | OpenAIRE |
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