Catégorie Habitat
Documents disponibles dans cette catégorie (2)
Affiner la rechercheChanges in alpine snowbed-wetland vegetation over three decades in northern Norway / Sylvi Marlen Sandvik in Nordic journal of botany, 32 (2014)
Titre : Changes in alpine snowbed-wetland vegetation over three decades in northern Norway Type de document : Imprimé Auteurs : Sylvi Marlen Sandvik ; Arvid Odland Année de publication : 2014 Article en page(s) : 377-384 Langues : Anglais (eng) Catégories : [OIEAU-Thèmes] Habitat
[CBNPMP-Géographique] Norvège
[CBNPMP-Thématique] Changement climatiqueRésumé : We have quantified floristic changes in alpine snowbeds and wetland vegetation during three decades and analyzed to what extent these changes are related to initial variations in snow cover duration and distance to groundwater level. Vascular plant species richness and total plant cover were estimated along three transects in northern Norway. Three different vegetation zones were identified along the original transects: relatively dry snowbeds, wet snowbeds and wetlands. The resampling shows major changes in species richness and plant cover. In general, there was a net immigration of species and 13 new species were found. Five rare species with initial low cover were lost. In the dry and wet snowbeds, species richness and total plant cover increased, mostly because of invasion by shrubs, graminoids and herbs. A general trend was that species indicating high soil moisture were strongly reduced. In the wetland zones there were no significant floristic changes but hygrophilous species had decreased and were replaced by graminoids and shrub species with lower water requirements. These floristic changes were significantly related to snow and soil moisture conditions, important factors for rate and direction of change. Contrasting vegetation responses within very short distances demonstrate the importance of detailed knowledge of the actual microhabitats when effects of climate change in alpine habitats are considered.
Identifiant : DOI : 10.1111/j.1756-1051.2013.00249.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=155429
in Nordic journal of botany > 32 (2014) . - 377-384Sandvik, S.M., Odland, A., 2014 . Changes in alpine snowbed-wetland vegetation over three decades in northern Norway. Nordic journal of botany, 32: 377-384.Documents numériques
article (2014)URL
Titre : Veratrum album in montane grasslands: a model system for implementing biological control in land management practices for high biodiversity habitats Type de document : Imprimé Auteurs : Urs Schaffner ; David Kleijn ; Valerie K. Brown ; Heinz Müller-Schärer (1954-) Année de publication : 2001 Article en page(s) : 19N-28N Langues : Français (fre) Catégories : [OIEAU-Thèmes] Habitat
[CBNPMP-Thématique] Prairies humides et hautes communautés herbeusesMots-clés : Veratrum album Résumé : Low-input agriculture on montane grasslands as practised until the mid 20th Century, haspromoted local biodiversity by creating and maintaining open and semi-open habitats belowthe timberline. Today, socioeconomic trends lead to management intensification in nearbygrasslands and to abandonment of more remote grasslands; either of these trends puts the localbiodiversity under pressure. One especially time-consuming and costly activity in montanealpine grasslands is weed control. In Europe, broadcast application of chemical control is notrecommended or not even allowed because the available herbicides are unselective, andtreatment of individual plants, either chemically or mechanically, is extremely labour-intensive. Stakeholders are therefore urged to develop new control concepts that areeconomically affordable and highly selective. The implementation of biological control intoexisting management schemes may provide an appropriate strategy for management of themost problematic montane grassland weeds. In order to develop effective biological weedmanagement strategies, it is necessary to (a) identify life cycle transitions of the weed that areboth amenable to manipulation and influential on population growth; and (b) combine controldue to natural antagonists and limiting resources. Veratrum album is an important weed ongrazed montane grasslands, because it exhibits acute toxicity to mammals and locallydisplaces fodder plants. This paper reviews the available information on the ecology of V.album and its natural antagonists, and explores prospects for its biological control. It issuggested that this species and its antagonists provide a promising model system for exploringthe possibilities of implementing biological weed management within existing and futuremanagement schemes of montane grasslands. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=155387
in Biocontrol News and Information > 22 (1) (2001) . - 19N-28NSchaffner, U., Kleijn, D., Brown, V.K., Müller-Schärer, H., 2001 . Veratrum album in montane grasslands: a model system for implementing biological control in land management practices for high biodiversity habitats. Biocontrol News and Information, 22(1): 19N-28N.Documents numériques
article (2001)URL
