Reference : Do climate warming and plant species richness affect potential nitrification, basal r...
Scientific journals : Article
Life sciences : Environmental sciences & ecology
http://hdl.handle.net/2268/67708
Do climate warming and plant species richness affect potential nitrification, basal respiration and ammonia-oxidizing bacteria in experimental grasslands?
English
Malchair, Sandrine mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Ecologie végétale et microbienne >]
De Boeck, Hans, J. [University of Antwerp, UIA > Biology > Plant and Vegetation Ecology > >]
Lemmens, Catherine, M.H.M. [Unitversity of Antwerp > Biology > Plant and Vegetation Ecology > >]
Merckx, Roel [Catholic University of Leuven > Earth and Environmental Sciences > Soil and Water Management > >]
Nijs, Ivan [university of Antwerp > Biology > Plant and Vegetation Ecology > >]
Ceulemans, Reinhart [University of Antwerp -UIA > Biology > Plant and Vegetation Ecology > >]
Carnol, Monique mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Ecologie végétale et microbienne >]
2010
Soil Biology & Biochemistry
Pergamon Press - An Imprint of Elsevier Science
42
1944-1951
Yes (verified by ORBi)
International
0038-0717
Oxford
United Kingdom
[en] Climate warming ; Plant species richness ; above and belowground link ; Diversity-ecosystem functioning ; Ammonia oxidizing bacteria ; nitrification ; basal respiration
[en] Ammonia-oxidizing bacteria (AOB) are key organisms in the N cycle, as they control the first, rate-limiting step of the nitrification process. The question whether current environmental disturbances, such as climate warming and plant diversity losses, select for a particular community structure of AOB and/or influence their activity remains open. The purpose of this research was to study the impact of a 3 °C warming and of plant species richness (S) on microbial activity and diversity in synthesized grasslands, with emphasis on the nitrification process and on the diversity (community structure and richness) of ammonia-oxidizing bacteria (AOB).We measured soil chemical characteristics, basal respiration, potential nitrification and AOB diversity in soils under increasing plant species richness (S ¼ 1, S ¼ 3, S ¼ 9) at ambient and (ambient +3 °C) temperature. Species were drawn from a 9-species pool, belonging to three functional groups: forbs, legumes and grasses. Mixtures comprised species from each of the three functional groups. Warming did not affect AOB diversity and increased potential nitrification at S ¼ 3 only. Under warmed conditions, higher plant species richness resulted in increased potential nitrification rates. AOB richness increased with plant species richness. AOB community structure of monocultures under legumes differed from those under forbs and grasses. Clustering analysis revealed that AOB community structure under legume monocultures and mixtures of three and nine species grouped together. These results indicate that functional group identity rather than plant species richness influenced AOB community structure, especially through the presence of legumes. No clear relationship emerged between AOB richness and potential nitrification whatever plant species richness and temperature treatment. Our findings show a link between aboveground and belowground diversity, namely plant species richness, AOB richness and community structure. AOB richness was not related to soil processes, supporting the idea that increased diversity does not necessarily lead to increased rates of ecosystem processes.
Fonds Wetenschappelijk Onderzoek - FWO ; Fonds National de la recherche scientifique-FNRS ; University of Liege-ULG
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/67708
10.1016/j.soilbio.2010.07.006

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