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Transformation of some organic matter components in organic soils exposed to drainage

In drained Histosols used as pastures or arable fields the muck-forming process transforms organic soil formations into muck. The rush vegetation (Caricetum acutiformis and Glycerietum maximae) covering Histosols in the organic matter accumulation stage is replaced by meadow vegetation (Molinietalia order). | Research Article Turk J Agric For 34 (2010) 245-256 © TÜBİTAK doi:10.3906/tar-0905-33 Transformation of some organic matter components in organic soils exposed to drainage Barbara KALISZ1,*, Andrzej LACHACZ1, Roman GLAZEWSKI2 1 Department of Soil Science and Soil Protection, University of Warmia and Mazury in Olsztyn, Pl. Lodzki 3, 10-727 Olsztyn, POLAND 2Department of Environment Protection Engineering, University of Warmia and Mazury in Olsztyn, ul. Prawochenskiego 1, 10-957 Olsztyn, POLAND Received: 27.05.2009 Abstract: In drained Histosols used as pastures or arable fields the muck-forming process transforms organic soil formations into muck. The rush vegetation (Caricetum acutiformis and Glycerietum maximae) covering Histosols in the organic matter accumulation stage is replaced by meadow vegetation (Molinietalia order). During sustained drainage mucks are transformed into muck-like formations that contain less than 12% organic carbon. The aim of this study was to report the changes in organic matter initiated by the muck-forming process. Soil organic matter was fractionated into humic-acid carbon, fulvic-acid carbon, and humins. The amount of carbon susceptible to oxidation with KMnO4 was also determined and, based on these results, lability, carbon pool, and management indices were calculated. Additionally, hot-water extractable carbon, corresponding to microbial biomass, was determined. The study’s results show that the muck-forming process caused a decrease in organic carbon and the concentration of total nitrogen, indicating a reduction in carbon sequestration in the soils. The humin fraction was predominant in untransformed soils and was positively correlated with clay, total nitrogen, and non-oxidizable carbon. Drainage of Histosols contributed to increasing the solubility of humus compounds. The humification index, and the content of humic and fulvic acids was higher in drained soils. Humic acids and fulvic acids content was 24% and 11%-12% of .