La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Northern Plants and Ozone
Auteurs :	Sirkku Manninen, Auteur ; Satu Huttunen, Auteur ; Hans Tommervik, Auteur ; Lars R. Hole, Auteur ; Sverre Solberg, Auteur
Type de document :	Article
Dans :	AMBIO (38(8) DEC 2009)
Article en page(s) :	406-412
Langues:	Anglais
Résumé :	Forests in northern Fennoscandia are mainly composed of the O-3-sensitive species-Scots pine and downy, mountain, and silver birches. Seminatural vegetation also contributes to biodiversity, carbon cycling, and ecosystem services as a part of forests, mires, meadows, and road verges. Fumigation experiments show that current O-3 concentrations of 30-50 ppb reduce plant biomass production and reproduction. Visible foliar injury is attributable to peak O-3 concentrations and relates to fast phenological development and high growth rate. Trees can acclimate to O-3-induced water stress by producing more xeromorphic leaves or needles. The direct effects of O-3 on grassland vegetation also translate to changes in the structure and size of the soil microbial community, and ecosystem N cycling. It is necessary to reduce the emission of O-3 precursors and maintain high biodiversity to protect northern ecosystems. Regular, systematic, countrywide monitoring and validation as well as quantification of the effects of O-3 on plants in the Nordic countries are also necessary.

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