Quantity and quality of dissolved organic carbon in ground waters of agricultural catchment and in adjacent littoral waters of Piaseczno Lake (eczynsko-Wodawskie Lake District)

Smal, H.; Ligeza, S.; Misztal, M.

Annales Universitatis Mariae Curie-Sklodowska. Sectio E, Agricultura 59(1): 423-430


ISSN/ISBN: 0365-1118
Accession: 004290864

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This paper presents the quantity and quality (fractions) of dissolved organic carbon (DOC) in shallow groundwaters of arable fields and littoral lake water in Poland and their seasonal changes. The study was conducted in the catchment of mesotrophic Piaseczno Lake during 1992-98. Groundwater samples were taken from the observation well installed on the arable area ~15-20 m from the shoreline, on the border between the fields and the beach. Ground and lake water for analyses were taken in spring, summer and autumn. In the water samples, total DOC and its fractions were determined. The fractions of DOC were the following: humic acids extracted in 0.5 mol NaOH dm-3, hemicelluloses dissolved in 0.5 mol H2SO4 dm-3 and fraction not yielding to extraction, i.e. residue. A computer program, STATISTICA, was used for statistical analyses. It was stated that the concentration of DOC and C of the humic acids in groundwaters was significantly higher than in the lake waters. However, no differences were found between waters when the percentage contribution of C in particular fractions to total DOC concentration was considered. In both kinds of water, the contribution of humic acids amounted to ~60%, hemicelluloses to 7-8% and residue to 30% of DOC. Seasonal changes in the concentration of DOC and C of the fractions in both waters were statistically non-significant. However, a tendency for its higher values in autumn in comparison with summer and spring were observed. The results suggest that the groundwaters from the agricultural part of the catchment have influence on the state of DOC in the lake waters.