Abstract
The method of testing water soil extracts was used to study the allelopathic regime of the soil one day and 30 days after the simulated recreational impact in seven forest ecosystems of the Sochi Black Sea region with a monodominant forest stand. It was determined that one-time recreational loads in the analyzed ecosystems are accompanied by an increase in allelopathic soil activity. A noticeable increase in phytotoxicity (16-66 %) is recorded at a load of 2.78-4.17 people/ha. Greater recreational impact (6.2-8.33 people/ha) leads to the formation of a path network, anaerobic conditions and inhibition of the biotest in the range 0.8-1.0. It was found that 30 days after a one-time recreational impact, soil activity is restored to control values only after a load of 1.39 people/ha. After a load of 2.78-4.17 people/ha, only a decrease in phytotoxicity by 9-21 % is observed. In areas after maximum exposure (6.25-8.33 people/ha), phytotoxicity decreases below control values in ecosystems dominated by Fagus orientalis L., Quercus petraea (Matt.) Liebl., Quercus pubescens Willd. and Carpinus betulus L., indirectly explaining the likelihood of introducing species alien to forest ecosystems along the trails. Significant soil activity persists in ecosystems with Taxus baccata L., Castanea sativa Mill., and Buxus colchica Pojark., explaining their resistance to one-time recreational loads.
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