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Title: Depth matters: effects of precipitation regime on soil microbial activity upon rewetting of a plant-soil system

Journal Article · · The ISME Journal
 [1];  [2];  [3];  [1];  [1];  [1];  [4];  [4];  [5];  [1];  [1]
  1. Univ. Bourgogne Franche-Comte, Dijon (France)
  2. Univ. Bourgogne Franche-Comte, Dijon (France); Iowa State Univ., Ames, IA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Swiss Federal Research Institute WSL, Birmensdorf (Switzerland)
  5. Univ. Politecnica de Madrid, Madrid (Spain)

Changes in frequency and amplitude of rain events, that is, precipitation patterns, result in different water conditions with soil depth, and likely affect plant growth and shape plant and soil microbial activity. Here, we used 18O stable isotope probing (SIP) to investigate bacterial and fungal communities that actively grew or not upon rewetting, at three different depths in soil mesocosms previously subjected to frequent or infrequent watering for 12 weeks (equal total water input). Phylogenetic marker genes for bacteria and fungi were sequenced after rewetting, and plant-soil microbial coupling documented by plant 13C-CO2 labeling. Soil depth, rather than precipitation pattern, was most influential in shaping microbial response to rewetting, and had differential effects on active and inactive bacterial and fungal communities. After rewetting, active bacterial communities were less rich, more even and phylogenetically related than the inactive, and reactivated throughout the soil profile. Active fungal communities after rewetting were less abundant and rich than the inactive. The coupling between plants and soil microbes decreased under infrequent watering in the top soil layer. In conclusion, we suggest that differences in fungal and bacterial abundance and relative activity could result in large effects on subsequent soil biogeochemical cycling.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1474362
Report Number(s):
LLNL-JRNL-738625; 891882
Journal Information:
The ISME Journal, Vol. 12; ISSN 1751-7362
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 79 works
Citation information provided by
Web of Science

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Cited By (7)

Soil microbial moisture dependences and responses to drying–rewetting: The legacy of 18 years drought journal December 2018
Rapid Shifts in Bacterial Community Assembly under Static and Dynamic Hydration Conditions in Porous Media journal October 2019
Contrasting Biogeographic Patterns of Bacterial and Archaeal Diversity in the Top- and Subsoils of Temperate Grasslands journal October 2019
Rapid Shifts in Bacterial Community Assembly under Static and Dynamic Hydration Conditions in Porous Media text January 2020
Improved soil biological health increases corn grain yield in N fertilized systems across the Corn Belt journal March 2020
Rapid Shifts in Bacterial Community Assembly under Static and Dynamic Hydration Conditions in Porous Media journal October 2019
Seasonal Dynamics of Soil Fungal and Bacterial Communities in Cool-Temperate Montane Forests journal August 2019

Figures / Tables (6)