CONDITION AND WATER DEFICIENCY OF BALSAMIC POPLAR LEAVES IN THE CONDITIONS OF POLYMETALLIC CONTAMINATION OF THE STERLITAMAK INDUSTRIAL CENTER

The paper presents materials on the water deficiency of leaves in the balsamic poplar in the conditions of polymetallic contamination of the Sterlitamak industrial center. The object of the research was poplar plantations located at different distances from the industrial enterprises of Sterlitamak. As a result, it was revealed that in the conditions of polymetallic contamination of the Sterlitamak industrial center at noon, with an increase in temperature and a decrease in relative humidity, the moisture consumption increases in the balsamic poplar. The maximum water deficit in the daytime is from 13 to 15 hours. In trees in conditions of polymetallic contamination of the SPC, the water consumption during the night hours is not covered by its intake, so the next day the morning hours began with some water shortage. As a result of the conducted studies, it was found that in the conditions of polymetallic pollution of the Sterlitamak industrial center, with the deterioration of the living condition and with a decrease in the proportion of absorbing roots of the balsamic poplar, significant changes in water deficit indicators are noted.

INFLUENCE OF HUMIC PREPARATIONS ON DEGRADED SOILS PROPERTIES OF TECHNOGENIC BARRENS

This research aim was testing the applicability of exogenic organic matter – extracted humic substances – for the remediation of technogenic barrens soils near Cu-Ni smelter (Kola Peninsula). In short-term laboratory experiments we studied the possibility of stabilization of heavy metals labile forms by commercial humic substances (HS) of different origin (peat humate “Flexom” and coal humate “Extra”) in comparison with HS, inoculated by microorganisms – nitrogen fixers and mycorrhizae-forming fungi and mineral fertilizers (NPK и CaCO3). Experiments were provided during 45 days after 14 days of pre-incubation under controlled conditions in climate chamber with light, temperature and humidity imitating the polar day conditions in Kola Subarctic. After experiments we evaluated changes in soil chemical properties, soil microbial community and test-culture (Deschampsia cespitosa). Peat humate application is ineffective without additional manipulations (e.g. combination with CaCO3), cooperation with biological applicants cannot be pointed out. Application of coal humate favours to metals stabilization, soil microorganism’s activation, test-culture growth. It may be effective to combine coal humate with biological applicants like mycorrhizae-forming fungi. So, coal-humates may be perspective growth-stimulator, ameliorant and detoxicant in remediation of degraded soils in conditions of polymetallic contamination.