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SANITARY AND PROTECTIVE LARIX SUKACZEWII DYL. STAND IN THE POLLUTION CONDITIONS OF THE STERLITAMAK INDUSTRIAL CENTER: STATUS AND PECULIARITIES OF ACCUMULATION OF HEAVY METAL


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Abstract

Introduction. Materials on the distribution of heavy metals in the organs of Larix sukaczewii Dyl are presented in the conditions of the pollution of the industrial center of Sterlitamak. Material and methods. Using the atomic absorption method, the content of copper, lead, and cadmium in the soil cover, needles, branches, and roots was determined in healthy and weakened larch trees. Results. Under conditions of the industrial pollution, the relative life condition of larch stands is estimated as «weakened» (LN = 74.25%), in the control zone as «healthy» (LN = 84.75%). Weakened trees with increasing metal concentrations in soils and roots show an increase in the concentration of metals in the aerial organs, and in healthy trees, it is more deposited in the roots. Discussion. The high content of heavy metals in the soil leads to a redistribution of the root-saturation of the soil with absorbing roots, which is manifested in a decrease in the biomass of the roots in the upper, most contaminated soil layers, and also negatively affects the vital state of the trees by decreasing the density of the tree crown and increasing the share of dead and dying branches on the trunks. Conclusion. Under conditions of contamination, larch is able to actively absorb and deposit a significant amount of Cu, Cd, and Pb, thereby limiting their distribution in the environment.


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