Shrubs help warming unlock ancient peat carbon
Vascular plants raised peatland respiration 145% vs bare peat; warming increased fluxes 111% on bare and 63% with dwarf-shrubs and shifted 14C toward older carbon where shrubs were present.
Source
Vascular plants promote ancient peatland carbon loss with climate warming
Study at a glance
- Design
- Other — Factorial warming × vegetation-removal peatland experiment with 14C-partitioned respiration
- N
- Treatment-level replicates n=3 for 14C/CO2 sampling; exact plot census not a single primary N in stored text
- Population
- Peatland plots with bare, bryophyte, graminoid, dwarf-shrub, and full vegetation treatments
- Outcome
- Ecosystem respiration flux and age (14C) under warming and vascular-plant presence
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Inspect source passages
Shrubs help warming unlock ancient peat carbon
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Respiration increased by 145% and 144% with dwarf-shrubs or graminoids vs bare/bryophyte plots.
being increased by 145% and 144% relative to the bare and bryophyte only treatments, respectively.
What 14C change occurred with warming in shrub plots?
Warming decreased ecosystem respiration 14 C content by 2 %Modern in the dwarf‐shrub only treatment and increased it by 1 %Modern in the fully vegetated treatment
What they did
A factorial warming and vegetation-removal experiment partitioned ecosystem respiration with 14C into plant vs peat sources across bare, bryophyte, graminoid, dwarf-shrub, and fully vegetated plots.
What they found
Respiration was 145% and 144% higher with dwarf-shrubs or graminoids than bare/bryophyte plots. Warming raised flux on bare (+111%) and dwarf-shrub (+63%) plots only. Shrub-only warming lowered respiration 14C by 2 %Modern (older C). Ambient bryophyte ‘plant’ respiration had a 412-year mean age, showing peat priming.
The limits
What it doesn't show
Plot-scale 14C partitioning does not quantify net peatland C balance under all future vegetation states; some treatments showed no warming flux response.
Key terms
- Ecosystem respiration
- CO2 flux from plants plus peat microbes.
- %Modern 14C
- Radiocarbon signature; lower values mean older carbon.
- Plant-induced peat respiration
- Peat CO2 primed or facilitated by living plants.
- Dwarf-shrubs
- Woody vascular plants (e.g., ericoids) on the peatland.
- Bryophytes
- Mosses lacking the vascular-plant priming effect seen here.
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Quiz yourself
Vascular plants raised respiration by about:
Common questions
Vascular plants vs bare respiration?
About +145% with shrubs or graminoids.
Warming on bare plots?
+111% flux.
Ancient C signal?
Shrub warming lowered 14C 2 %Modern; bryophytes primed 412-year peat.
Does temperature alone predict 14C?
No—air/soil T and water table were uncorrelated with 14C.
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