Abstract
Various types of grasslands in the Netherlands were catagorized by their structure: phytomass and leaf area were measured in arbitrarily chosen vegetation layers with width intervals of 2.5, 5, 10 or 20 cm, depending on the height of the sward. Data were standardized for fixed width of layers (layer width set), and for equal numbers of layers of varying width (layer number set). Data were clustered by Ward's method as well as ordinated by Principal Components Analysis (PCA). The cluster method revealed 6 groups; those of the layer number sets could be contrasted in their vertical built-up of leaf area index (LAI) — and phytomass profiles and could be characterized ecologically. The ordinations confirmed the findings of the cluster analyses. In our data grassland structure varied mainly along a gradient from constant and sufficient to strongly varying soil water supply during the growing season, and a gradient in soil nutrients from rich to poor. Sites with constant water supply appeared more often nutrient-rich and those with a varying water supply more often poor in nutrients.
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Dedicated to Prof. H. F. Linskens (Nijmegen) on the occasion of his 65th birthday.
Nomenclature of syntaxa follows Westhoff & Den Held (1969).
Acknowledgements: Financial support for this study was obtained from the Foundation for Fundamental Biological Research (BION) under grant nr. 14.75.18. We thank R. K. Peet and M. P. Austin for their useful comments.
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Werger, M.J.A., Dusink, E.M. & Fliervoet, L.M. Types of phytomass — and leaf area index profiles in grassland vegetation. Vegetatio 65, 39–45 (1986). https://doi.org/10.1007/BF00032125
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DOI: https://doi.org/10.1007/BF00032125