[en] The combined effect of declining diversity and elevated temperature is a less-studied aspect of global change. We investigated the influence of those two factors and their possible interactions oil leaf ecophysiological processes in artificial grassland communities. Changes at the leaf level are at the basis of changes at the community level (and vice versa) but have remained largely unexplored in biodiversity experiments. We focused on end-of-season responses to assess whether species richness and air temperature affect the duration of the growing season. Grassland model ecosystems were used in 12 sunlit, climate-controlled chambers. Half of these chambers were exposed to ambient air temperatures, while the other half were Nvarnied 3 degrees C. Each chamber contained 24 plant communities, created with nine grassland species: three grass species. three nitrogen (N) fixers and three non-N-fixing dicots. Each plant community consisted of either one, three or nine species in order to create different species richness levels. Various ecophysiological variables (processes and characteristics) and above ground biomass were influenced by temperature. In several variables, the effects of temperature and species richness varied with species. No single-factor species richness effect was found due to opposite responses of the species canceling out the effect. We expect that these interactions may increase with time. (c) 2005 Elsevier B.V. All rights reserved.
Lemmens, CMHM; Universiteit Antwerpen - UA > Department of Biology > Research Group of Plant and Vegetation Ecology
De Boeck, H. J.; Universiteit Antwerpen - UA > Department of Biology > Research Group of Plant and Vegetation Ecology
Gielen, B.; Universiteit Antwerpen - UA > Department of Biology > Research Group of Plant and Vegetation Ecology
Bossuyt, H.; Katholieke Universiteit Leuven - KUL > Department Earth and Environmental Sciences > Division Soil and Water management
Malchair, Sandrine ; Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Ecologie végétale et microbienne - Département des sciences et gestion de l'environnement
Carnol, Monique ; Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Ecologie végétale et microbienne
Merckx, R.; Katholieke Universiteit Leuven - KUL > Department Earth and Environmental Sciences > Division Soil and Water management
Nijs, I.; Universiteit Antwerpen - UA > Department of Biology > Research Group of Plant and Vegetation Ecology
Ceulemans, R.; Universiteit Antwerpen - UA > Department of Biology > Research Group of Plant and Vegetation Ecology
Language :
English
Title :
End-of-season effects of elevated temperature on ecophysiological processes of grassland species at different species richness levels
Publication date :
2006
Journal title :
Environmental and Experimental Botany
ISSN :
0098-8472
eISSN :
1873-7307
Publisher :
Pergamon-Elsevier Science Ltd, Oxford, United Kingdom
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