| Summary: | Background. The study of phosphorus metabolism of lawn plants growing in
areas with different degrees of anthropogenic load allows to identify changes in the
basic physiological and biochemical processes in plants at different stages of ontogenesis,
to reveal the mechanisms of environmental sustainability and the possibility
of correcting the conditions for creating high-quality turf coatings in cities.
Materials and methods. The objects of study were lawn plants (Dactylis glomerata
L. and Poa pratensis L.) of three age States: virginal (v), middle-aged generative
(g2) and subsenile (ss). The research was carried out in the territory of the city of
Yoshkar-Ola of the Mari El Republic. Samples were taken for analysis in conditionally
clean, medium-polluted and polluted zones. The content of total phosphorus
was determined by photocolorimetric method on the “blue” phosphor-molybdenum
complex. To characterize the processes of phosphorus movement, the coefficient of
motion (Kp) was used. Data processing was carried out by statistical method.
Results. In the urban environment in the vegetative organs of lawn plants
(D. glomerata, P. pratensis) determined the content of total phosphorus. As pollution
increased, the total phosphorus content in the leaves and roots of lawn plants
decreased. During ontogenesis from the virginal state to the generative state, this index
increased followed by a fall in the subsenile state in all zones of the study.
In this case, the basipetal distribution of phosphorus in the vegetative organs of lawn
plants was clearly manifested. In general, a higher content of total phosphorus in the
vegetative organs was characteristic of individuals of D. glomerata compared to individuals
of P. pratensis.
Conclusions. The content of total phosphorus in the vegetative organs of lawn
plants depends on the species and biological age of lawn plants, as well as environmental
conditions. Phosphorus leaves aging cells with age and its concentration in
old tissues is usually lower than in young ones. An increase in the negative anthropogenic
environmental impact on lawn plants causes a decrease in the total phosphorus
content in their vegetative organs.
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