Kuiper, L. C. 1988. The structure of natural Douglas-fir forests in western Washington and western Oregon. Agricultural University Wageningen Papers 88-5. Wageningen, The Netherlands: Agricultural University Wageningen. 47 p.
The structure of 5 natural Doulilas-lir stands, located on relatively good siteswithin the Tsugu hetet-old) yllu zone in western Washington and western Oregon,was analysed in 1984. Stand ages ranged from 50 to 1000 years. Vertical dia-grams and crown projection maps were used to identify developmental phases.The results were presented in such a way that the spatial coherence betweenthe forest components was maintained, while describing the characteristics oftrees, eco-units and the forest mosaic for each plot in detail. From the resultsgeneral developmental trends were deduced. The structure of natural Douglas-fir forests appeared to be very heterogeniously and diversified in all deg elopmen-tal phases.
l\e) words: Pseudotsuga mentiesii, Douglas-fir, vertical diagram. structure.stand development.