Die Erlenwälder im nordwestlichen Niedersachsen : methodik der Aufnahme, floristisches Inventar und Gliederung nach strukturellen und floristischen Kriterien (original) (raw)

Within the framework of a survey of alder carrs in northwestern Lower Saxony, 101 relevés were made. The area of the relevés was 400 m2, with no more than 3 relevés in any continuous forest area. The data set was classified using 3 different methods. First, 28 dominance types were distinguished based on the domin­ ant growth form or dominant species in the herb layer. Second, 21 operational vegetation types based on overall floristic composition were distinguished. These types were than reduced to 6 basic types using both floristic and ecological information. Third, a standard phytosociological classification was carried out using differential species of known phytosociological value. This led to the subdivison of 2 associations, one of which was furthermore divided into 3 subassociations and in one case 3 variants. Advantages and disadvan­ tages of the different classification approaches are discussed with reference to the sampling method used. The appropriateness of any classifica...

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