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Interactive effects of depth and differential irrigation on soil microbiome composition and functioning
Dan Naylor1, Katherine Naasko1,2, Montana Smith3
1Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, United States.
Frontiers in Microbiomes
|March 19, 2026
Summary
Soil moisture impacts soil microbiomes differently with depth. Surface soil microbes are more sensitive to drought than deeper soil microbes, affecting soil health.
Area of Science:
- Soil Science
- Microbiology
- Environmental Science
Background:
- Soil microbiomes are crucial for ecosystem functioning.
- Climate change is predicted to increase drought frequency and severity.
- The impact of moisture fluctuations on soil microbiomes across soil depths remains unclear.
Purpose of the Study:
- To investigate the interactive effects of soil depth and irrigation levels on soil and wheatgrass rhizosphere microbiomes.
- To understand how moisture availability influences soil microbiome composition and function at different soil depths.
Main Methods:
- Field study with controlled irrigation levels (100%, 75%, 50%, 25%) and soil depths (0-5 cm, 5-15 cm, 15-25 cm).
- Analysis of soil and wheatgrass rhizosphere microbiomes, including community composition, diversity, and functional profiles (transcriptomics, metabolomics).
Main Results:
- A significant interaction between soil depth and irrigation was observed, with surface soils showing greater sensitivity to moisture changes.
- Rhizosphere microbial communities exhibited similar responses to irrigation across depths, but cultivar-specific differences were noted ('Alkar' vs. 'Jose').
- Functional profiles (transcriptomic and metabolomic) also demonstrated a depth-dependent response to soil moisture.
Conclusions:
- Soil microbiome responses to moisture stress are depth-dependent, with surface layers being more vulnerable.
- Deeper soil layers may harbor stress-resistant microbes, leading to a dampened response to irrigation changes.
- Future soil microbiome research should include multiple depths for a comprehensive understanding of environmental stress impacts.
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