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Contemporary Problems of Ecology

2005 year, number 4

The State of Fir Forests of the Khamar-Daban in the Zone of Influence of Atmospheric Discharges of the Baikal Pulp and Paper Mill

T. I. MOROZOVA, T. A. OSKOLKOVA, A. S. PLESHANOV

Abstract

Atmospheric emissions of the BPPM cause a systemic weakening of fir forests of the Khamar-Daban ridge which is accompanied by development of fungal epiphytoties. The maximum of pollution fell on the beginning of the 1980ies when the volume of emissions exceeded 30 000 tons per year. The further decrease of the level of pollution was accompanied by a growth of resistance of trees estimated by the total content of resinous compounds. In accordance with this, the activity of fungal epiphytoties began to decrease, and the percentage of coniferous leaves decreased to the background level. It was established that the volumes of emissions of the BPPM at the level of 7000 tons a year may be considered as maximally admissible for ensuring the protection of forests of the given region.