Spruce forest bryophytes in central Norway and their relationship to environmental factors including modern forestry

In this study of bryophyte diversity in 110 patches of spruce forests of bilberry, small fern, low herb, tall fern and tall herb type in S or-Tronde central Norway, each patch (from 0.24 to 9.33 ha) was class ified as one main vegetation type and one su ccessional stage or cutt ing class. The bryophytes in each patch were censused in randomly est ablished squares of 10 x 10 m, supplemented by complete sampling in t he rest of the patch. A number of environmental variables was sampled , and the data sets trea ted with DCA and CCA. Altogether 210 bryophy tes (71 liverworts and 139 mosses) were found in the squares, and 285 (96 liverworts and 189 mosses) in the forest patches. The average nu mber of liverworts, mosses and bryophytes in forest patches increased gra dually from the dry and poor to the moist and rich forest types. Several red listed and other interesting spruce forest species had t heir only or main occurrence in the rich and humid forest, and in old cutting classes.