РЕКРЕАЦИОННЫЕ ИЗМЕНЕНИЯ АЛЛЕЛОПАТИЧЕСКОЙ АКТИВНОСТИ КОРНЕВЫХ СИСТЕМ ДРЕВОСТОЯ В ЛЕСНЫХ ЭКОСИСТЕМАХ

Abstract

The study of the influence of chronic recreational impact in forest ecosystems on the allelopathic activity of the root systems of arboreal species was carried out. It was determined that with an increase in the recreational impact, the transformation of the allelopathic activity of roots increases, averaging from 27.3 %, at stage II of recreational digression, to 83.4 % at stage V. Large values of activity at stage II are recorded in plantations with a smaller number of species in the stand. An increase in the load leading to stages III-V is accompanied by an increase in root exudates and a decrease in the biomass of small roots in communities with a large number of woody species (3-4 species). Active root ends are more sensitive to the number of species in the stand and to the recreational density of the soil throughout the entire range of recreational digression, reacting to a greater extent to the recreational load (soil compaction) at the stage of its manifestation (stage II, 35.7 %), the stage of critical recovery (stage III, 2.9 %) and at the highest stage (stage V, 90.4 %) of the forest community. A significant reaction at the highest loads, which fits into the regularities of anaerobic soil conditions, accompanied by self-poisoning of plant organisms as a result of the transformation of root exudates into highly reduced compounds, suggests that in the zone of highly compacted paths, root systems die not only due to a lack of oxygen for root respiration but also from poisoning with toxic compounds formed during the transformation of root secretions by anaerobic heterotrophs.