| Title | Changes in soil microbial substrate utilization in response to altered litter diversity and precipitation in a Mediterranean shrubland |
| Publication Type | Journal Article |
| Year of Publication | 2017 |
| Authors | Shihan A., Hattenschwiler S., Milcu A., Joly F.X, Santonja M., Fromin N. |
| Journal | Biology and Fertility of Soils |
| Volume | 53 |
| Pagination | 171-185 |
| Date Published | Feb |
| Type of Article | Article |
| ISBN Number | 0178-2762 |
| Accession Number | WOS:000392372200003 |
| Keywords | Agriculture, biodiversity loss, carbon, Climate change, community, COMPOSITION, decomposition, drought, ecosystem processes, elevated co2, functional diversity, Grassland, litter decomposition, Mediterranean ecosystem, microresp (tm), plant-species diversity, soil microbial activity |
| Abstract | This study aimed at quantifying the consequences of reduced precipitation and plant diversity on soil microbial community functioning in a Mediterranean shrubland of southern France. Across a natural gradient of shrub species diversity, we established a total of 92 plots (4 x 4 m) with and without a moderate rain exclusion treatment of about 12 % of total precipitation. Shrub diversity included all possible combinations of the four dominant species (Cistus albidus, Quercus coccifera, Rosmarinus officinalis, and Ulex parviflorus). Respective leaf litter mixtures of these species combinations were exposed in all plots over 2 years. We quantified how litter species richness and the reduction in precipitation affected the soil microbial substrate utilization (measured by CO2 evolution using the MicroResp method) on soil samples collected underneath each individual litter mixture after 1 and 2 years of decomposition. Moderate precipitation reduction had a minor impact, but litter species richness and the dissimilarity in phenolic concentrations (estimated using Rao's quadratic entropy) showed a positive effect on the diversity of substrates metabolized by the microbial communities. Moreover, litter species richness increased soil microbial activity by increasing the catabolic diversity of the soil microbial community. These effects were mostly driven by the presence of Quercus and Ulex leaf litter, which at the same time reduced microbial metabolic dominance, while the presence of Rosmarinus had opposite effects. Our data suggest that plant species loss can have stronger effects on the functioning of soil microbial communities than moderate drought, with potentially important feedbacks on biogeochemical cycling in Mediterranean shrubland ecosystems.
|
| Short Title | Biol. Fertil. SoilsBiol. Fertil. Soils |
| Alternate Journal | Biol. Fertil. Soils |
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Times Cited: 23
Cited Reference Count: 74
Shihan, Ammar Hattenschwiler, Stephan Milcu, Alexandru Joly, Francois-Xavier Santonja, Mathieu Fromin, Nathalie
Joly, François-Xavier/C-4599-2018; 安, 妮/AAN-5439-2020; Santonja, Mathieu/L-5483-2017; Santonja, Mathieu/M-8020-2019; Milcu, Alexandru/X-6267-2018
Joly, François-Xavier/0000-0002-4453-865X; Santonja, Mathieu/0000-0002-6322-6352; Santonja, Mathieu/0000-0002-6322-6352; Fromin, Nathalie/0000-0003-3752-7503; Shihan, Ammar/0000-0001-8140-3562; Milcu, Alexandru/0000-0002-2889-1234
Agence Nationale de la Recherche through the project CLIMED ["ANR-09-CEPL-007"]; Syrian Ministry of Higher Education, University of Aleppo
We are grateful to all the colleagues from CEFE UMR 5175 and from IMBE UMR 7263 who contributed to the setup and maintenance of the rain exclusion experiment in Marseille. Litter C, N, P, phenolic, and WHC analyses were performed at the IMBE UMR 7263 in Marseille with the help of Caroline Lecareux. DCP and MicroResp analyses were performed at the Plate-Forme d'Analyses Chimiques en Ecologie, LabEx Centre Mediterraneen de l'Environnement et de la Biodiversite. Dissolved carbon and nitrogen analyses were performed at the Eco&Sols BioSolTrop lab (LabEx Centre Mediterraneen de l'Environnement et de la Biodiversite) in Montpellier with the help of Jean Larvy Delariviere. We are grateful to Dr. Paolo Nannipieri and two anonymous reviewers for their comments that helped to improve the manuscript. Funding was provided by the Agence Nationale de la Recherche (contract "ANR-09-CEPL-007") through the project CLIMED. A. Shihan received a PhD grant from the Syrian Ministry of Higher Education, University of Aleppo.
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Shihan, A (corresponding author), Univ Paul Valery Montpellier, EPHE, CEFE, UMR 5175,CNRS,Univ Montpellier, 1919 Route Mende, F-34293 Montpellier 5, France.; Shihan, A (corresponding author), Aleppo Univ, Dept Renewable Nat Resources & Environm, Fac Agr, Aleppo, Syria.
ammarsh80@hotmail.com; stephan.hattenschwiler@cefe.cnrs.fr; alex.milcu@cnrs.fr; joly.fx@gmail.com; mathieu.santonja@gmail.com; nathalie.fromin@cefe.cnrs.fr
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