IMPACT OF WOOD WASTE ON BIOLOGICAL ACTIVITY OF TECHNOGENIC SURFACE FORMATIONS OF ROADSIDE AREAS

Abstract

of the RAS, Tobolsk One of the most important functions and an integral indicator of the ecological state of soils and technogenic surface formations is biological activity. Reduced biological activity and toxicity of degraded soils and technogenic surface formations may be due to both their adverse properties and a variety of pollutants (heavy metals, salts, petroleum products). In addition to diagnosing the state of technogenic surface formations and the degree of toxicity, it is necessary to develop ways to restore their ecological functions, including increasing biological activity and reducing toxicity. One of the directions can be the introduction of organic substances into technogenic surface formations to optimize the physical, chemical and biological functions of the soil. Source of organic substance for technogenic surface formations may serve as wood waste from the storage of pulp-paper industry. The aim of this work was to study the impact of wood waste on the biological activity and mobility of toxic metals in technogenic surface formations of roadside areas. In samples of wood waste and technogenic surface formations by standard methods were analyzed content of nitrogen, carbon, phosphorus, calcium, magnesium and acidity level. Biological activity of wood waste and technogenic surface formations was determined by phytotesting. Change of chemical properties of wood waste with depth was established. The layers (5,5–9,0 m) with optimal properties were selected. The impact of wood waste on the biochemical and toxicological properties of technogenic surface formations in roadside areas was assessed on the example of soils of roadside spaces of outside urban highways. The method of biotesting with sprouts of cress ( Lepidium sativum L.) established an increase in the biological activity of technogenic surface formations due to the introduction of wood waste in dosages of 5 and 15 % by weight. Shown to reduce the mobility of lead in technogenic surface formations after