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NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.

1999

Sammendrag

Vegetation data were collected in 1931, 1961 and 1991 from permanent plots in a boreo-nemoral forest 20 km north of Oslo in southern Norway. Major changes were found in the vegetation composition during 60 years. The main changes were a reduction in the frequency and frequency of joint occurrence of species like Calluna vulgaris, Vaccinium uliginosum, Trientalis europaea, Maianthemum bifolium, Melampyrum pratense, Cornus suecica, Andromeda polifolia, Eriophorum vaginatum, Vaccinium oxycoccus, Pleurozium schreberi, Hylocomium splendens, Ptilium crista-castrensis, Dicranum fuscescens and Ptilidium ciliare. The observed changes were interpreted as induced by internal processes e.g., a long-term change from paludified forest to mesic forest. In particular the growth of Picea abies seems in particular to be a main driving force. The dominance of Picea abies and Vaccinium myrtillus appears to have made the conditions more unfavourable to other species. A doubling of the living stem biomass of P.abies during the last 67 years shows that this old-growth forest has not reached a steady state. Species like Deschampsia flexuosa and Molinia caerulea did not increase in frequency as has been demonstrated in response to nitrogen deposition elsewhere in northern Europe. The results of this study indicate that protection from logging has promoted the reduction of species in the field layer and bottom layer. This study questions if monitoring of forest vegetation should be restricted to protected forests as is the practice in Scandinavia today. We recommend that areas with some kind of selective cutting are also used for monitoring of forest vegetation