The structure and properties of humic substances from brown coal 11 years after addition into soil
2009
Kwiatkowska-Malina, J., Warsaw University of Technology, Warsaw (Poland)
Soils in many areas of Poland are characterized by low contents of organic matter, which greatly contributes to their limited fertility and productivity, and higher vulnerability to contamination and degradation. Recently, the use of organic amendments other than traditional manure showed to be efficient for the improvement and/or restoration of soil organic matter. Brown coal added to soil may be transformed into humic substances (HS) in (micro)biological and abiotic ways. An application of organic matter from brown coal resulted after 11 years in changed structure of humic acids (HAs) extracted from soil as indicated by an increase of the carbon contents in elemental composition, and consequently decreased values of the H:C ratio. HAs extracted from amended soil showed higher absorbance values in the UV-VIS region, higher contents of oxygen functional groups, and were more resistant to thermal decomposition. HAs molecules were also richer in aromatic structures and resistant to decomposition with a high potential of sorption properties. Organic matter from brown coal introduced to soil relatively slowly undergoes transformation and thus causes permanent soil enrichment with HS.
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