NDLI: Changes in soil microbial substrate utilization in response to altered litter diversity and precipitation in a Mediterranean shrubland

Content Provider	Springer Nature Link
Author	Shihan, Ammar Hättenschwiler, Stephan Milcu, Alexandru Joly, François Xavier Santonja, Mathieu Fromin, Nathalie
Copyright Year	2016
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 × 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.
Starting Page	171
Ending Page	185
Page Count	15
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	53
Issue Number	2
e-ISSN	14320789
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-12-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Climate change Mediterranean ecosystem Litter decomposition Functional diversity Soil microbial activity MicroResp(™) Agriculture Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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