Abstract
<p>Considering the discrepancies in the reports on seasonal changes in the content of dissolved organic carbon, this paper concerns the research which aimed at defining the content and seasonal changes in dissolved organic matter (DOM) in arable and meadow soils in moderate climate conditions. The research has involved the soils sampled in the kujawsko-pomorskie province (Poland). Gleic Phaeozems (meadow soils), Brunic Arenosols and Eutric Cambisols were sampled from the depth of 0-30 cm, 30-60 cm and 60-100 cm, November 2011 through September 2013. The soil samples were analyzed for dry weight content, pH, content of total organic carbon and total nitrogen. DOM was extracted with 0.004 mol·dm<sup>-3</sup> CaCl<sub>2</sub>, in the extracts the content of dissolved organic carbon (DOC) and dissolved nitrogen (DNt) were assayed. The share of DOC was determined by the soil management. The analysis of variance did not show significant differences in the content of TOC and Nt across the soil sampling dates. Were recorded changes in DOC and DNt between successive sampling dates; for topsoil for DOC – from -12.06% to 13.34% (meadow soils) and for DNt -40.84% to 47.44% (arable soils).</p><p><strong> </strong></p>
Highlights
The presence of organic matter is one of the most important soil features, which is related to the key role played by humus in most processes which occur in pedosphere
Considering the discrepancies in the reports on seasonal changes in the content of dissolved organic carbon, this paper concerns the research which aimed at defining the content and seasonal changes in dissolved organic matter (DOM) in arable and meadow soils in moderate climate conditions
The highest content of total organic carbon (TOC) of the Gleic Phaeozems sampled from the depth of 0–30 cm was recorded for sample no. 19 (Table 3)
Summary
The presence of organic matter is one of the most important soil features, which is related to the key role played by humus in most processes which occur in pedosphere. In the organic matter resources in soil one can distinguish dissolved organic matter (DOM), which is the most mobile and fast-decomposing (Haynes 2000, Gonet et al 2002). DOM often accounts for less than 1% of the total organic matter, it affects the chemical, biological and physical soil properties considerably (Chantigny 2003). DOM plays an essential role in the biogeochemical cycling of carbon, nitrogen and phosphorus and it can provide nutrients and energy for microorganisms (Haynes 2000, Kalbitz et al 2000). DOM is chemically and physically bonded, it participates in the transport of pollutions in the soil profile (Kalbitz et al 2000, Gonet et al 2002, Staunton et al 2002)
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