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Corticolous and lignicolous plant communities in the forest associations of the Douglas-fir forest on Vancouver Island Szczawinski, Adam F.

Abstract

An attempt was made to find the relations between the occurrence, abundance, dominance, constancy and vigour of corticolous and lignicolous cryptogams in some forest associations of Douglas-fir forest on Vancouver Island. It has been found that corticolous and lignicolous plant sociations do indicate the particular stratum of the ecoclimate of forest associations. Bryophytes (studied by Krajina) and lichens growing as corticolous and lignicolous plants correspond to the limiting climatological factors which occur in different ecoclimates. The ecoclimate of the forest associations forms one or two or several climatic strata, which are expressed by the corresponding corticolous socia tions on the same tree species. These ecologically differentiated strata develop a zonation phytosociologically defined. Corticolous and lignicolous sociations forming part of the ecosystem of the forest association furnish further characteristics for their differentiation. Its practical use is obvious, especially in winter when the ground vegetation is covered by snow.

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