Szukana fraza: [Abstract = "However, one may assume that very dense and concentrated patches of its seedlings will contribute to the low efficiency of the natural regeneration of the stand in the future. The most serious threat to the ex\-istence of the alder carr community is the subsidence of the ground caused by coal exploitation, resulting in the creation of a subsidence water basin. Permanent submergence, observed in some parts of the alder carr, has led to the death of many black alder trees. Partial amelioration of the study area is needed to reduce the negative effects of mining and to allow the Ribeso nigri\-Alnetum community to persist in the future."]

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