The role of plant communities Typhetum latifoliae in the formation and protection of water bodies has been presented in this paper. They are the most common marshy plant communities in Poland and in the world. The ability to strengthen and stabilize the banks of water bodies has been emphasized. The results of own researches on mechanical properties of Typha latifolia have been presented. The tensile strength of individual parts of plants – rhizomas, base of shoots and shoots have been determined. These data have been compared to data relating to some species of trees, bushes and herbaceous plants, given by other Authors. As can be inferred, Typha latifolia is important element, stabilizing and protecting the substrate from water erosion, creating a security system more durable and environment – creating than artificial strengthening.

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