| Title | Soil microbial activity in a Mediterranean garrigue responds more to changing shrub community than to reduced rainfall |
| Publication Type | Journal Article |
| Year of Publication | 2020 |
| Authors | Fromin N., Shihan A., Santonja M., Baldy V., Hattenschwiler S. |
| Journal | Plant and Soil |
| Volume | 449 |
| Pagination | 405-421 |
| Date Published | Apr |
| Type of Article | Article |
| ISBN Number | 0032-079X |
| Accession Number | WOS:000521897000002 |
| Keywords | Agriculture, biodiversity, biomass, carbon, Climate change, climate-change, Community weighted mean, drought, functional diversity, litter, litter decomposition, microresp (tm), plant functional diversity, Plant Sciences, resilience, respiration, semiarid ecosystems, TRAITS |
| Abstract | Aim The functioning of soil microbial communities is co-determined by plant community composition and environmental factors. Decreased precipitation predicted in the Mediterranean area will affect both determinants, yet their interplay on soil microbial functioning is poorly understood. Here we assessed the interaction of plant community diversity and reduced precipitation on microbial metabolic activity and diversity in the topsoil of a Mediterranean shrubland in Southern France. Methods With a large field experiment using 92 plots that differed in the diversity of the four dominant shrub species (Quercus coccifera, Cistus albidus, Ulex parviflorus, and Rosmarinus officinalis) we manipulated the average precipitation (a mean reduction of 12%) over three years and analyzed the community level physiological profile (MicroResp (TM)) after 7 and 31 months of partial rain exclusion. Results Partial rain exclusion had only subtle effects on soil microbial parameters. Soil microbial global metabolic activity and diversity increased with total shrub cover but tended to decrease with shrub diversity under control conditions, relationships that were absent with partial rain exclusion. We showed strong shrub composition control over the soil microbial parameters, with a particularly strong effect of Q. coccifera. Conclusion Our results suggest that climate change may have greater impact on soil microbial functioning via shifts in plant community composition rather than through direct effects of reduced precipitation, yet this may depend on how precipitation will change.
|
| Short Title | Plant SoilPlant Soil |
| Alternate Journal | Plant Soil |
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Fromin, Nathalie Shihan, Ammar Santonja, Mathieu Baldy, Virginie Hattenschwiler, Stephan
Santonja, Mathieu/0000-0002-6322-6352; Shihan, Ammar/0000-0001-8140-3562; Fromin, Nathalie/0000-0003-3752-7503
French National Research Agency (ANR) as part of the CLIMED research project [ANR-09-CEP-007]; Aleppo University, Syria
This study was funded by the French National Research Agency (ANR) as part of the CLIMED research project (contract "ANR-09-CEP-007") and through a grant of Aleppo University, Syria to AH. We are grateful to all the colleagues from CEFE UMR 5175 and from IMBE UMR 7263 who contributed to the set-up and maintenance of the rain exclusion experiment inMarseille. We especially thank Jean-Francois David and Mathieu Coulis for soil sampling, Natalia Rodriguez-Ramirez for plant survey, Jean-Philippe Mevy (IMBE) and Cyril Bernard (CEFE) for meteorological data, and Alexandre Clet for his help during MicroRespT analyses. Litter traits andMicroRespT analyses were performed at the Plate-Forme d'Analyses Chimiques en Ecologie, LabEx Centre Mediterraneen de l'Environnement et de la Biodiversite, with the help of Bruno Buatois and Clemence Dufresne. Dissolved Carbon and Nitrogen analyses were performed at the Eco&Sols BioSolTrop lab (LabEx Centre Mediterraneen de l'Environnement et de la Biodiversite, Montpellier) with the help of Jean Larvy Delariviere. We kindly thank Sylvain Coq for pre-submission review and comments on the manuscript. Finally, we are grateful to the two anonymous referees for their helpful comments.
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Dordrecht
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