Long-term drought sends soil microbes down a one-way street
Deng S, Yang Y, Guo X, Yuan MM, Zhang Y
Soil Health
The soil life supporting your garden beds and the prairie you hike through doesn't just bounce back from drought the way plants do above ground; this study shows it keeps drifting further from normal the longer dry conditions persist, which means recovery may take far longer than the drought itself.
Scientists dried out patches of prairie soil for six years straight and tracked the bacteria, fungi, and tiny protists living in it. Instead of just losing a few species, the drought pushed these communities onto a completely different trajectory that kept diverging further from normal soil year after year. The surviving microbes formed tighter, more specialized networks dominated by drought-tolerant types, which made the soil's day-to-day functioning more predictable but also more fragile if conditions changed again.
Key Findings
Six years of experimental drought caused progressive declines in soil microbial diversity and biomass across bacteria, fungi, and protists.
Drought-treated soils showed increasingly divergent successional trajectories over time, with random (stochastic) community assembly processes giving way to stronger deterministic environmental filtering, especially for bacteria.
Drought shrank microbial network size but increased bacterial network complexity and stability by favoring drought-tolerant taxa, altering functional genes tied to ecosystem processes.
chevron_right Technical Summary
A six-year drought experiment in a tallgrass prairie found that soil microbial communities (bacteria, fungi, and protists) don't just decline under drought, they shift onto increasingly divergent paths over time, losing diversity while becoming more tightly wired and less resilient to further disturbance.
Abstract Preview
Original paper
Experimental drought drives divergent succession of soil microbiota.
As droughts become increasingly severe and prolonged worldwide, understanding how belowground biodiversity changes over time under water limitation is critical for assessing ecosystem resilience. H...
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