Long-term dynamics of the humic substances content in fen water in the south-taiga subzone of Western Siberia.

In the given work the analysis of long-term humic substances content dynamics in water of a typical fen has been carried out, the correlation and factorial analysis has been executed. It is noted that the main supplier of organic substances in bog water is humus of peat deposit, and the humic substances content dynamics is defined by a degree of decomposition of peas and depends on the kind of plants. The correlation analysis has allowed to establish strongly pronounced dependence between humic substances content and oxidation-reduction potential of a peat deposit, close communication in separate years is marked with levels of bog water, moisture of peat, temperature of a peat deposit, temperature of air. Researches have shown that a complex of factors of the environment defines humic substances content in bog water. The increase in air temperature, as a whole, promotes an increase in the concentration of fulvic acid more than humic acids. The receipt of atmospheric precipitation, in one case, promotes an increase in concentration fulvic acid as a result of transformation of fossils and their receipt in a solution at a decrease in levels of bog water, in other cases occurs rain dilution of bog water and a decrease in concentration of substances. In wet period high correlation fulvic acid content with levels of bog water whereas in other years the factor of correlation or sign changes are observed, or this communication weakens. Humic acids are less water-soluble than fulvic acid; therefore, the receipt of atmospheric precipitation practically does not influence their concentration change. In seasonal dynamics of the humic substances content, their increase only by the end of the period of vegetations (August-September) is noted. As a rule, during the periods with high air temperature there is an accumulation of humic substances in a peat deposit and their receipt in bog water is carried out in a wet period and while an increase in bog water level. The conducted analysis of long-term changes of humic substances concentration in fen water has not revealed statistically significant tendencies, some reduction of fulvic acid concentration and an increase in humic acids, however, is noted. As a result, economic use of peat bogs, changes of environmental conditions towards increases in air temperature will promote a raise of organic substances content in water, groundwater and river water, as well as deterioration of geoecological conditions of region.

Keywords

Authors

References