The impact of long-term CO2 enrichment and moisture levels on soil microbial community structure and enzyme activities
2012
Guenet, B. | Lenhart, K. | Leloup, J. | Giusti-Miller, S. | Pouteau, Valerie | Mora, P. | Nunan, N. | Abbadie, L. | Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE) ; Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) | Modélisation des Surfaces et Interfaces Continentales (MOSAIC) ; Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE) ; Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) | Justus-Liebig-Universität Gießen = Justus Liebig University (JLU) | Université Pierre et Marie Curie - Paris 6 (UPMC) | Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12) | Biogéochimie et écologie des milieux continentaux (Bioemco) ; École normale supérieure - Paris (ENS-PSL) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS) | Centre National de la Recherche Scientifique (CNRS)
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Show more [+] Less [-]English. Soil organic matter is the most important reservoir of terrestrial organic C and minor changes in the balance may have a significant impact on the climate. However, the response of microbial decomposers of soil C to global changes is not fully apprehended. This is particularly the case with regard to the interactive effects of the various climatic changes. Here, we present data from the Giessen Free Air CO2 Experiment (Gi-FACE, University of Giessen, Germany) in which the CO2 concentration at a grassland site was increased by 20% relative to atmospheric levels during a period of 10 years. The site included a slope that resulted in differences in average soil moisture. The effects of CO2 and soil moisture on soil microbial community structure, measured by Denaturing Gradient Gel Electrophoresis (DGGE), PhosphoLipid Fatty Acids (PLFA) and enzyme activity profiles were determined. Total carbon, nitrogen and phosphorous contents were also determined. Soil moisture explained a large part of the variance in the microbial community structure data, by affecting fungi and bacteria. Furthermore, the CO2 treatment had no significant effect on either overall PLFA or DGGE profiles, despite the fact that the fungal:bacterial PLFA ratio was altered. Overall enzyme activity profiles were also only affected by soil moisture levels, although the CO2 treatment induced a significant increase of the acid phosphatase activity. Finally, neither soil moisture nor elevated CO2 induced changes in the soil C stock. (C) 2011 Elsevier B.V. All rights reserved.
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