Das Zonobiom-Konzept von Heinrich Walter - Probleme seiner Anwendung am Beispiel von Florida, USA
In contrast to Walter & Breckle (1991) the division of Florida in zonobiome II, the zono-ecotones II/V and V/II (between evergreen tropical forests with summerrain and the following formation) and the zonobiome V (warm-temperate, evergreen broadleaved laurophyll forests), in this paper is proposed a division in zonobiome II, a zono-ecotone II/V and a still today overlooked pedobiome "IV" (Sclerophyllous forests, normally bound to winterrain, but, like chapparal in Arizona also possible with summerrain, if other conditions are dry enough), important by its great area in Central Florida which is occupied by this formation. It is realized as pedobiom caused by the dry, sandy soils and high summer temperatures. Zonobiome V is restricted to only very small areas near the west coast of the peninsula, inmidst of azonal swamp-, salt marsh- and freshwater marsh-vegetation. The classification of nearly the whole Northern and Central Florida to this zonobiome V (or zono-ecotones with it) in literature goes back to the classification of Magnolia grandiflora as a laurophyll tree. But this is wrong, because the tree is an evergreen species with peculiar leaf-texture in the beech-forest-zone, something like other evergreen species, f.e. Rhododendron catawbiense, Hedera- or Ilex-species in comparable temperate regions of the world. The anatomy of sclerophyllous and laurophyllous leaves needs further investigations in spite of the study of De Lillis (1991), who cannot find clear boundaries between these leaf types. But the author has excluded from her study all real laurophyllous species from North America, the Canary Island as well as from Eastern Asia.