Cellulose plus C4 grass steers prairie soil microbes
Adding cellulose and heat-tolerant Andropogon gerardii shifted restored prairie soils toward higher fungal biomass and slower-growing bacteria that may retain carbon.
Source
Soil microbial restoration strategies for promoting climate-ready prairie ecosystems
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Cellulose plus C4 grass steers prairie soil microbes
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DNA was extracted from each of 72 treated pots.
we defrosted frozen soils collected from each of the 72 treated pots and extracted total genomic DNA using a PowerSoil DNA Isolation Kit
Warming room was +4°C above ambient.
One room was kept at ambient temperature while we elevated the temperature in the other room to + 4°C above ambient.
What they did
Agricultural soil in 72 pots received remnant-prairie inoculum and/or cellulose, planted with one vs three prairie species, then grown 62 days at ambient or +4°C; lipids, enzymes, 16S, and soil C were measured.
What they found
Cellulose raised fungal:bacterial lipid ratios (18:2ω6,9c and 18:1ω9c up; Gram-positive lipids down) regardless of plant mix. Plant richness had few microbial effects. Coupling cellulose with heat/drought-tolerant grasses selected higher fungal biomass and oligotroph-leaning bacteria.
The limits
What it doesn't show
A 62-day pot study cannot prove long-term field carbon sequestration; watering prevented drought so warming×moisture interactions were muted.
Key terms
- Cellulose amendment
- Recalcitrant carbon addition intended as a prebiotic to favor fungi and slow-growing bacteria.
- PLFA
- Phospholipid fatty acids used as biomass markers for fungi vs bacteria.
- Copiotroph vs oligotroph
- Fast labile-C users vs slow-growth taxa associated with C storage.
- Andropogon gerardii
- C4 big bluestem used as a heat-tolerant prairie grass.
- Remnant inoculum
- Microbes transferred from intact prairie soil into agricultural soil.
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Cellulose amendment mainly increased:
Common questions
What did cellulose do to fungi:bacteria?
Raised fungal:bacterial lipid ratios.
Did plant species richness strongly reshape microbes?
Few effects at ambient temperature.
Warming treatment?
+4°C above ambient for 62 days.
Restoration implication?
Pair cellulose with heat-tolerant grasses.
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