The proportion stabilization between plant species with different mycorrhizal status – one of the attractors of progressive successions?

Characterized by the participation of plants with different mycorrhizal status in several successions in the steppe and forest-steppe zones. During progressive successions the share of mycorrhizal plants species increases while the share of nonmycorrhizal and optional mycorrhizal plants species falls. Ratio of plants with different mycorrhizal status varies in the later successional stages within the narrow limits: nonmycorrhizal species – 5–10%; optional mycorrhizal species – 15–20 %; mycorrhizal species – 70–80 %. In the early successional stages the variability of this ratio is significantly higher.