摘要：Fallen dead wood is an important structural element in Eurosiberian alder swamp forests thatsupports diversity of epixylic bryophyte species. Th e aim of the present study was to assess thebryophyte diversity on logs in relation to abiotic and biotic factors. Four Eurosiberian alder swampforests stands were studied in three territories of Latvia – Moricsala Nature Reserve, Zvarde MeziNature Park and Slitere National Park. In total 102 logs were described. Overall 59 bryophytespecies were recorded. Th e main factor aff ecting the richness of bryophyte species was decay stage.Composition of bryophyte species gradually changed during succession. Logs that were in the middecay stage supported the largest number of bryophyte species. Th e visible perimeter of logs did notaff ect composition and number of bryophyte species. Diff erences in bryophyte species compositionwere found between deciduous and coniferous logs. Some diff erences in fl ora of epixylic bryophytespecies were recognized between the studied territories
关键词：decay stage; epixylic bryophytes; Eurosiberian alder swamps; indicator species analysis;logs
