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High mountain lakes and atmospherically transported pollutants / Richard William Battarbee (2005)

Public Citation est un extrait de Global change and mountain regions / Uli M. Huber (2005) Titre : High mountain lakes and atmospherically transported pollutants Type de document : Extrait d'ouvrage Auteurs : Richard William Battarbee (1947-) ; Uli M. Huber ; Harald K. M. Bugmann ; Mel A. Reasoner ; Martin Beniston ; Simon Patrick ; Martin Kernan ; Roland Psenner (1950-) ; Hansjoerg Thies ; Joan Grimalt ; Bjoern O. Rosseland ; Bente Wathne ; Jordi Catalán ; Rosario Mosello ; Andrea Lami ; David Livingstone ; Evzen Stuchlik ; Vera Straskrabova ; Gunnar Raddum Editeur : Dordrecht : Springer Netherlands Année de publication : 2005 Importance : 113-121 Catégories : [CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude [CBNPMP-Thématique] Etude d'aménagement, étude d'impact, actions anthropiques et leur impact [CBNPMP-Thématique] Lac d'altitude Résumé : Remote mountain lakes, whether found at high altitudes or high latitudes, usually appear to be in pristine condition. In particular, those lakes that are situated above or beyond the tree-line are rarely disturbed by agricultural or forestry practices and few if any people inhabit their catchments. However, recent research indicates that even the most remote lakes are impacted by atmospherically transported pollutants, and that greenhouse-gas forced climate change is beginning to have a significant influence on ecosystem functioning. UV-B radiation is also increasing and, in interaction with global warming, may already be changing biogeochemical cycles in many mountain lakes (Vinebrooke and Leavitt, this volume). All sites are subject to multiple stresses, and studies of the ecological response of mountain lakes to such combined stress need to consider interactions between all factors, both natural and anthropogenic. In this chapter, we consider acid deposition, toxic substances and climate change as the three main drivers of ecosystem change in high mountain lakes. Lien pérenne : DOI : 10.1007/1-4020-3508-X_12 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=147857 Battarbee, Richard William (1947-), Huber, Uli M., Bugmann, Harald K. M., Reasoner, Mel A., Beniston, Martin, Patrick, Simon, Kernan, Martin, Psenner, Roland (1950-), Thies, Hansjoerg, Grimalt, Joan, Rosseland, Bjoern O., Wathne, Bente, Catalán, Jordi, Mosello, Rosario, Lami, Andrea, Livingstone, David, Stuchlik, Evzen, Straskrabova, Vera, Raddum, Gunnar 2005 High mountain lakes and atmospherically transported pollutants. In: Global change and mountain regions. Springer Netherlands, Dordrecht: 113-121.

Low litter cover, high light availability and rock cover favour the establishment of Ailanthus altissima in forests in southern Switzerland / Simon Knüsel in Neobiota, 46 (2019) 

Public Citation [article]  inNeobiota > 46 (2019) . - 91-116 Titre : Low litter cover, high light availability and rock cover favour the establishment of Ailanthus altissima in forests in southern Switzerland Type de document : Imprimé Auteurs : Simon Knüsel ; Marco Conedera ; Harald K. M. Bugmann ; Jan Wunder Année de publication : 2019 Article en page(s) : 91-116 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes Mots-clés : Ailanthus altissima (Mill.) Swingle, 1916 Résumé : Future forest composition is uncertain in many areas due to climate change. The spread of non-native species adds to these uncertainties, particularly in forests recently colonised by novel tree species. To anticipate future forest composition, and thus the provision of ecosystem services, a thorough understanding of the factors influencing the establishment of non-native tree species is essential. We studied the presence and abundance of regeneration of Ailanthus altissima (Mill.) Swingle in 89 plots on a regular grid in three sites in southern Switzerland to determine the main drivers of its establishment. All sites are located in abandoned, i.e. currently unmanaged stands of Castanea sativa Mill. Propagule pressure is caused by single mature A. altissima that colonised the area ca 40 years ago. We found high rock cover, low litter cover and high light availability to be the most important predictors for the presence of A. altissima regeneration, whereas its abundance was positively influenced by high light availability, low litter cover and high browsing on regeneration of competing species. However, the presence models performed much better than the abundance models. Interestingly, the most important factors favouring the establishment of A. altissima in recently undisturbed sites were found to be similar in a nearby site after a severe forest fire, which suggests a similar establishment strategy after a disturbance as in recently undisturbed forests. Based on our results we expect a further expansion of the species in lowland forests currently dominated by C. sativa, likely controlled primarily by light availability. Lien pérenne : DOI : 10.3897/neobiota.46.35722 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=149376 Knüsel, Simon, Conedera, Marco, Bugmann, Harald K. M., Wunder, Jan 2019 Low litter cover, high light availability and rock cover favour the establishment of Ailanthus altissima in forests in southern Switzerland. Neobiota, 46: 91-116.

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