Control over the accumulation of heavy metals (HM) in agrophytocenoses is an urgent environmental problem. An obligatory component of all field agrophytocenoses are various agrobiological groups of weeds. The purpose of this work was to study the features of HM accumulation in the weed component of agrophytocenoses. The study was carried out in agrophytocenoses of the Yaroslavl region, represented by winter and spring crops, legumes, corn, industrial crops, and a wide variety of weeds. According to the data of the route survey of crops in the Yaroslavl region, the weediness of agricultural plants was 31–101 pieces per square meter. Weeds differed in the content of HMs: by 5.8 times for Zn; more than 14 times for Cd and Pb; and about 6 times for Cu. Dandelion medicinal and creeping wheatgrass expressed the barrier function of the roots in relation to all of the studied elements. The contribution of weeds to the general elimination of trace elements and heavy metals by plants of agrophytocenoses is insignificant. Keywords: weeds, heavy metals, trace elements, barrier function of roots

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The article presents the results of ecological and geochemical assessment of the soils of the South-Western administrative district of Moscow on the content of heavy metals. In general, a satisfactory environmental situation was observed. However, in the territories subjected to industrial zones, there was an excess of background concentrations of heavy metals. In the course of the research, 6 clusters representing different types of heavy metals assemblages were identified.

The work was aimed at evaluating the involvement of heavy metals in the biogeochemical cycle in the soil-plant system in the setting of agrophytocenoses. The elemental composition of soil and plants was determined by atomic absorption. The sanitary-hygienic and ecological assessment of the condition of soils and plants in the region by heavy metals content has been provided for the first time; for individual items, the health risk of soil contamination and used agricultural products has been assessed. For the first time, background concentrations of priority pollutants in the soil and plants have been found at different sites from contamination sources; the annual average volumes of removal of Cd, Pb, Zn, Cu, Ni, Cr, and Mn from the soil have been established; the antagonistic-synergistic interactions have been revealed at the introduction of macro-and microelements into plants.