Abstract

At early stages of successions initiated by the destruction of Buxus colchica, 58 alien plant species have been registered in the Khosta yew–boxwood grove, including 14 species that actively penetrate into natural forest phytocoenoses. One to eight alien grass species were identified on sampling plots 400 m² in size, which amounts to 8–57% of the total species richness. The maximum number of alien species was noted in forest communities with the tree canopy density of 0.4–0.7 in the upper story. The grass–dwarf-shrub layer on such sites has been formed under the conditions of relatively good insolation and relatively low projective cover of dominant species. At the same time, alien grass species demonstrate the highest competitiveness level in forest communities with high tree canopy density; such communities have no clearly manifested dominants in the grass–dwarf-shrub layer owing to the poor insolation.

中文翻译：

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黄连木破坏后高加索自然保护区Khosta紫杉－黄杨木林的森林群落中外来植物物种的扩散

摘要

在破坏黄连木引起的演替的早期阶段，霍斯塔紫杉-黄杨木林中已经注册了58种外来植物物种，其中包括14种积极渗透到天然森林植物群落中的物种。在400 m ^2的采样地上鉴定出1至8种外来草种大小，占物种总丰富度的8–57％。在森林群落中，外层物种的最大数量被注意到，上层的树冠密度为0.4-0.7。在这些地区的草矮灌木层是在相对较好的日照和优势物种的相对较低的投射覆盖率的条件下形成的。同时，外来草种在具有高树冠密度的森林群落中表现出最高的竞争水平；由于日照差，这些群落在草矮灌木层中没有明显表现出优势。