Systematic-ecological analysis of seasonal catalase activity of peat soils of drained swamp pine forests of Western Siberia
T. T. Efremova, S. P. Efremov, A. F. Avrova
Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of Science, Sukachev Institute of Forest, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russia
Keywords: mesotrophic swamps, degree of hydro-reclamation, seasonal dynamics trends, analytical indicators of time series, paired regression analysis, canonical analysis
Abstract
Peat soils (Drainic Hemic Histosols) of a drained mesotrophic swamp of the South taiga subzone of Western Siberia occupied by pine forests (Pinus sylvestris L.) were studied. The most favorable conditions for the development of soil catalase activity were observed in the regime of moderate hydro-reclamation. By this level, the oxidase activity of weakly and intensively drained soils was 71 % and did not differ statistically from each other. A reliable relationship by parabola-type between seasonal catalase activity and time factor has been established. Parabolic trends of weakly and intensively drained soils show: Catalase activity accelerated weekly on average by 1.04 and 1.27 absolute values with weekly average deceleration by 0.12 and 0.14 units, respectively. In soils of moderate drainage, the average weekly decrease was 1.31 with a weekly average acceleration of 0.076 units. Analytical indicators of the time series made it possible to identify intra-seasonal periods of catalase activity, determine the direction and intensity of changes, and differentiate the soil profile by 0-5, 5-10, and 10-30 cm in terms of the intensity of processes. An area of 5-10 cm, equivalent to the concept of median (growth coefficients increase up the profile, decrease down by about one and a half or two times), corresponds to one approximation or another to the indicators of seasonal enzymatic activity of the soil profile as a whole (0-30 cm) per season. A highly significant advantage of the parabola type has been established: a positive regression relationship between the catalase activity of soils and bulk moisture >17…<71 %, pH 3.6-4.4, redox potential >600 mV, negative - with a temperature from 2 to 17 °C. According to the canonical analysis, the interrelated effect of the discussed indicators in soils of weak drainage was 82 %, moderate - 40 % and deep - 57 %. The coefficients of the factor structure postulated bulk moisture as the dominant environmental parameter for regulating the enzymatic activity of peat soils.
|
