Characteristics of the accumulation of heavy metals in ecotonal ecosystems of the West-Siberian Subarctic

The article reflects the results of studies on the content and accumulation of heavy metals such as chromium, lead, nickel, zinc in the soil and the total phytomass of anthropogenic ecotonal ecosystems of the West-Siberian Subarctic, Russia. Analysis of the obtained results showed that the ecotone effect is clearly appears in relation to the biodiversity of vascular plants, the density of phytocenoses, the values of these indicators increased in comparison with the neighboring phytocenoses. A comparative analysis of the accumulation of heavy metals in soils showed a regular decrease in the content of heavy metals in the soils of ecotones and their increase in the adjacent natural communities. The phytomass of ecotones actively accumulates the studied metals; its greatest concentration is noted on the ecotonal sections of roadside phytocenoses. The coefficient of biological absorption and the biogeochemical activity of species varies in different sections, but has the highest value in the roadside ecotonal sections. According to the intensity of absorption the elements are arranged in the following sequence: Ni > Cr > Pb > Zn.The article reflects the results of studies on the content and accumulation of heavy metals such as chromium, lead, nickel, zinc in the soil and the total phytomass of anthropogenic ecotonal ecosystems of the West-Siberian Subarctic, Russia. Analysis of the obtained results showed that the ecotone effect is clearly appears in relation to the biodiversity of vascular plants, the density of phytocenoses, the values of these indicators increased in comparison with the neighboring phytocenoses. A comparative analysis of the accumulation of heavy metals in soils showed a regular decrease in the content of heavy metals in the soils of ecotones and their increase in the adjacent natural communities. The phytomass of ecotones actively accumulates the studied metals; its greatest concentration is noted on the ecotonal sections of roadside phytocenoses. The coefficient of biological absorption and the biogeochemical activity of species varies in different sections, but has the highest value in the roadside ecotonal...