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The types of B. erectus meadows in the Swiss Jura, their dependence on habitat conditions and economic influences, and relationships to original vegetation



The types of B. erectus meadows in the Swiss Jura, their dependence on habitat conditions and economic influences, and relationships to original vegetation



Beitr Geobot Landesaufn Schweiz 33: 1-309



The Bromus erectus meadows of the Swiss Jura are subjected to a thorough phytosociological and statistical analysis as to quantitative features, area types and relations to forests. As a number comprising most analytic features of spp., the "representation number" is established as 1/100 of the product of constancy and characteristic occurrence. Several associations and subassociations are distinguished both among Xerobromum and Mesobromium. constituting a "subjurassic-SW. Swiss." and a "Suevian-N. Swiss. "facies of either. While Xerobromium is tied to extreme sites in the dry-warmest parts of the area, Mesobromium occurs on various sites and is of a rich edaphic division. Most associations are anthropogenic permanent stages, more seldom primary transitory consortia, and each corresponds to a defined association of natural forest, as clearly shown by the constituting spp., but with an increasing cultural influence the number of anthropochores considerably increases. According to the area type specter, the Xerobromium belongs to the sub-meridional belt series while Mesobromium is azonal.

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