A ‘green’ ground-improvement technique substantially restructured the soil microbiome
WHAT THE EVIDENCE SAYS
A two-phase injection experiment tested microbially induced carbonate precipitation under different cementation-solution concentrations, nutrient additions and cycle counts. Calcium carbonate rose from about 4.1% to 11.1–14.4% and permeability declined, but microbial diversity also fell with repeated treatment. Community restructuring strengthened with treatment intensity, and even repeated sterile-saline injection shifted community composition, showing that the process itself—not only the inoculated organism—can alter soil ecology.
WHY IT MATTERS / OUR READ
A lower-carbon engineering technique can still have ecological side effects. If MICP moves into restoration, erosion control or infrastructure soils, microbial change belongs in performance monitoring rather than being assumed benign because the material is biologically mediated.
CAVEATS / UNCERTAINTY
This was a short-term soil-column experiment, not a field-scale infrastructure project. Sequencing shows community restructuring, not downstream ecosystem impairment, and the effects of repeated injection, salinity, chemistry and inoculation cannot be fully separated in every comparison.
SOURCE
Journal of Soils and Sediments — primary study
View original evidence ↗
Injection-based microbially induced carbonate precipitation increased carbonate and reduced permeability, but repeated treatment also lowered diversity and shifted native microbial communities.
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