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Depending on environmental demands, power , (or tolerance ) and competitive strength are formed in the course of succession out of plant communities, species composition can be identified by a specific. Plant communities are by vegetation surveys mapped, tabular comparison identified in, then described and classified in accordance with the phytosociological classification of descriptive empirical method of plant sociology [1]

Plant communities are in an ecological context, with its sites. Heinz Ellenberg examined the correlations between the ecological requirements of species and their locations, and strengthened the notion pointer value . Vegetation surveys have thus clear conclusions about the environmental, abiotic site factors of a plant stand for. Reinhold Tüxen has stressed that plant communities species composition built up to be by and at the conclusion of a plant community on the location of the characteristic species set considered, therefore, be in order next to the biotic and anthropogenic influences on the site to determine anorganoischen also [2] .

Mostly also zoocoenosis which biocoenoses of animals , their decisively by plants societies embossed habitat adapted. The plant community ( phytocoenoses ) stands in interaction and dependency with the animal societies ( zoocoenosis ). These are the groups often influence each other. A plant community can also be a certain associated zoocoenosis be assigned. Conversely, giving the occurrence of animals in a plant community information on their environmental claims. Plant communities can be distinguished according to their origin.

Because of these factors derived plant communities are often the basis for the classification and valuation of biotopes in a biotope mapping . Plant sociology is therefore an important tool of applied landscape ecology . Here, the real vegetation facilities consisting of replacement companies will be charged. From the replacement companies, soil and climate, the potential natural vegetation are derived and organic finds and climate models, the original natural vegetation can be reconstructed. Botany, zoology , soil science , landscape planning and nature conservation use, for example, the concept of potential natural vegetation (PNV), or current-potential natural vegetation (hpnV).

In the various theories of succession ( Klimaxvegetation , mosaic-cycle concept , Megaherbivorentheorie ) plays a key role in plant community classification and discussion of various stages of succession and succession patterns in terrestrial and semiterrestrischen ecosystems .