C - Lublin

of organic particles and their electrostatic repulsion from solid phase to the
solution.
The concentration of the DOM increased exponentially with the pH of the
extraction. An equation DOM(pH)=0,01exp(b 1 *pH) provided high correlation
between the experimental data (R 2 >0.94 in most cases). The highest concentration
of released OM was obtained for the strongly secondary transformed sample
(W 1 =0,74). The opposite result was obtained for the weakly secondary transformed
sample (W 1 =0,48).
CONCLUSION
The b 1 index could be satisfactorily used to quantify the DOM release process
in relation to the increase in soil pH. The release of the DOM depended on the
degree of the secondary transformation of the studied peat-moorsh soils.
REFERENCES
1. Gawlik J.: Water holding capacity of peat formations as an index of the state of their
secondary transformation, Polish J. of Soil Sci, 2, 121-126, 1992.
2. Gawlik J., Harkot W.: Influence of the kind of moorsh and the state of its
transformation on germination and growth of Lolium perenne in the pot plant
experiment during spring-summer cycle, Acta Agrophysica, 26, 25-40, 2000.
3. Kononowa M.M.: Soil organic matter, Pergamon, Elmsford, N.Y., 1966
4. McDowell W.H., Wood T.: Podzolization: soil processes control dissolved organic
carbon concentrations in stream water, Soil Sci., 137, 23-32, 1984.
5. MacCarthy P., Rice J.A.: Spectroscopic methods for determining functionality in
humic substances. In G.R. Aiken et al. (ed.) Humic substances in soil, sediment and
water. John Wiley and Sons, New York. 1985.
6. Okruszko H.: The principles of identifications and division of hydrogenic soils for
amelioration purposes (in Polish), Bibl. Wiad. IMUZ, 52, 7-54, 1976.
7. Schnitzer M., Khan S. U., Soil organic matter, Elsevier. Sci. Pub.Comp., N.Y., 1978.
8. Sposito G.: The Chemistry of Soils, N.Y., Oxford, Oxford University Press, 1989.
9. Wershaw R.: Membrane – Micelle model for humus in soils and its relation to
humification. U.S. Geological Survey Water Supply, 2410, 1994.
108