Distribution of plant functional attributes in a managed forest in relation to neighbourhood structure

The importance of neighbourhood structure on the distribution of plant func tional attributes was investigated in two managed forests in Denmark. Speci es composition was recorded for 325 plots of 5 x 5 m and species were assig ned to functional groups based on vegetative attributes: (a) Raunkiaer life -form and (b) height of adult plants, and regenerative attributes: (c) mode of dispersal and (d) pollination class. The distribution of attributes was related to neighbourhood parameters that reflect the composition, distribu tion and diversity of nine habitat classes within a 25-m radius from the fo cal plot. Regression trees were used to analyse counts of attributes per pl ot. Best predictors were neighbourhood scores for open areas, road-side hab itat, and neighbourhood diversity. The correlation between individual funct ional attributes and neighbourhood parameters were presented in a correlati on matrix. A cluster analysis, representing a first step towards the constr uction of plant functional types, resulted in five groups characterised by a particular combination of functional attributes and preference of neighbo urhood.