| Summary: | Background. The research of the content of toxic chemical elements in various
components in natural ecosystems is one of actual issues of the biosphere ecology.
The purpose of the work was to study the background concentrations of cadmium in
vascular plants in forest ecosystems of the Volga Upland in Penza region.
Materials and methods. The research material was a number of samples of organs
and tissues of the most common types of vascular plants of various life forms.
They were selected during the period of time from September, 2015 to December,
2019. The samples were analyzed with the use of the MGA-915 MD atomic absorption
spectrometer. Statistically calculated in Past 3.
Results and conclusions. As a result of measurements, the quantitative content of
cadmium in the biomaterial of woody and herbaceous plants has been determined.
The processing of the statistical data allowed drawing the following conclusions.
Trees accumulate the largest amount of the element in question, while grasses accumulate
the smallest. On this indicator, bushes occupy a middle position. The species
specificity is manifested in the nature of the cadmium accumulation by vascular
plants. The content of the element in the vegetative organs and tissues of woody
plants is not uniform. The minimum values were determined for the roots and the
wood tissue of the trunk, the average values were determined for leaves, and the
maximum values were determined for bark. The medicinal and edible vegetable raw
materials, procurement of which is possible in the researched forest communities of
Penza region, are safe with respect to the cadmium content. In protected areas, the
entire supply of toxic elements coming from atmospheric precipitation is held therein.
In this regard, they have the same – or even higher – rates of cadmium content in
the soil and the biological objects than in the forest areas where fellings take place.
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