Distribution of total and clay-associated organic matter in profiles of arable loamy sand Spodosol
2015
Boitsova, L. | Zinczuk, E. | Neprimerova, S. | Balashov, E.
Stabilisation of soil organic matter (SOM) in clay particles is important when the effect of management practices on organic carbon sequestration is being assessed. The objective of the present study was to quantify the differences in total SOM content in bulk soils and clay particles along four soil profiles under perennial grass-red clover and vetch-oat mixtures with and without farmyard manure (FYM) amendment. The results have shown that the highest accumulation of total SOM in bulk soil was observed in top horizons of soils amended with FYM for both crops. The total SOM content in bulk soil decreased down the soil profile but on average it was higher in the FYM-amended soils. Primary minerals (quartz, feldspar), as compared to phyllosilicates (micas and chlorite), dominated in clay-sized fractions of soils. The highest clay-associated SOM content was also determined in the topsoil horizons. A more pronounced effect of FYM on the content of clay-associated SOM was observed in the topsoil under vetch-oat mixture. The clay-associated SOM content decreased with soil depth and negatively correlated to abundance of micas (r = -0.50 to -0.99).
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