Pine needles and soil as bioindicators of forest ecosystems in the anthropogenically disturbed areas of the Baikal region

Abstract

Forest ecosystems of Baikal region were chosen a subject of comprehensive research conducted on the basis of the monitoring network created. Recommendations of the international manual ICP Forests, as well as the authors’ developments were used for the research. The study was focused on toxicological, physiological-biochemical, and biogeochemical indicators that adequately reflect the state and manifestation of the protective properties of the forest ecosystem main components (tree-stand and soil) under the influence of anthropogenic factors – air pollution, urbanization, and irrational forest management. The assessment of the vital state of tree-stands of Scots pine (indicator species) was carried out on the basis of representative indicators: pigments, the level of enzymatic and non-enzymatic components of antioxidant protection, the content and ratio of biogenic elements, changes in morphometric parameters. When studying soil in anthropogenically disturbed territories, an increase in soil density, a decrease in natural moisture, aeration, and humus content were found, alkalization of the upper horizons and accumulation of pollutants with a low migration rate in the upper horizons of the soil profile. Air pollution and high recreational load were shown to produce the greatest stressful impact on the forest ecosystems.