Abstract
Abstract A fast growing high density Populus plantation located in central Italy was exposed to elevated carbon dioxide for a period of three years. An elevated CO 2 treatment (550 ppm), of 200 ppm over ambient (350 ppm) was provided using a FACE technique. Standing root biomass, fine root turnover and mycorrhizal colonization of the following Populus species was examined: Populus alba L., Populus nigra L., Populus x euramericana Dode (Guinier). Elevated CO 2 increased belowground allocation of biomass in all three species examined, standing root biomass increased by 47–76% as a result of FACE treatment. Similarly, fine root biomass present in the soil increased by 35–84%. The FACE treatment resulted in 55% faster fine root turnover in P. alba and a 27% increase in turnover of roots of P. nigra and P. x euramericana . P. alba and P. nigr a invested more root biomass into deeper soil horizon under elevated CO 2 . Response of the mycorrhizal community to elevated CO 2 was more varied, the rate of infection increased only in P. alba for both ectomycorrhizal (EM) and arbuscular mycorrhizas (AM). The roots of P. nigra showed greater infection only by AM and the colonization of the root system of P. x euramericana was not affected by FACE treatment. The results suggest that elevated atmospheric CO 2 conditions induce greater belowground biomass investment, which could lead to accumulation of assimilated C in the soil profile. This may have implications for C sequestration and must be taken into account when considering long‐term C storage in the soil.
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Claims 8
Claim · model-written summary
Elevated CO2 increased standing root biomass across three Populus species by 47–76%.
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standing root biomass increased by 47–76% as a result of FACE treatment”
t0“Populus”
Claim · model-written summary
Elevated CO2 increased fine root biomass by 35–84%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fine root biomass present in the soil increased by 35–84%”
t0“Populus species grown under elevated CO2”
Claim · model-written summary
FACE accelerated P. alba fine root turnover by 55%.
- Taxon
- P. alba
Populus albae0 - Treatment
- FACE treatmente0
- Outcome
- fine root turnovere0
- Direction
- fastere0
- Value
- 55%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FACE treatment resulted in 55% faster fine root turnover in P. alba”
Claim · model-written summary
FACE increased root turnover in P. nigra and P. x euramericana by 27%.
- Taxon
- P. nigra and P. x euramericana
Populus ×canadensis
Populus nigrae0 - Treatment
- FACE treatmente1
- Outcome
- turnover of rootse0
- Direction
- increasee0
- Value
- 27%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 27% increase in turnover of roots of P. nigra and P. x euramericana”
t0“FACE”
e1“standing root biomass increased by 47–76% as a result of FACE treatment”
Claim · model-written summary
P. alba and P. nigra allocated more root biomass to deeper soil under elevated CO2.
- Taxon
- P. albaPopulus albae0
- Treatment
- elevated CO 2e0
- Outcome
- root biomass into deeper soil horizone0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. alba and P. nigr a invested more root biomass into deeper soil horizon under elevated CO 2”
Claim · model-written summary
Ectomycorrhizal infection increased in P. alba under elevated CO2.
- Taxon
- P. albaPopulus albae0
- Treatment
- elevated CO 2t0
- Interactor
- ectomycorrhizal (EM)e0symbiont
- Outcome
- rate of infectione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rate of infection increased only in P. alba for both ectomycorrhizal (EM) and arbuscular mycorrhizas (AM)”
t0“elevated CO2”
Claim · model-written summary
P. nigra had greater arbuscular mycorrhizal infection.
- Taxon
- P. nigraPopulus nigrae0
- Treatment
- elevated CO 2t0
- Interactor
- AMe0symbiont
- Outcome
- infection only by AMe0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“roots of P. nigra showed greater infection only by AM”
t0“elevated CO2”
Claim · model-written summary
FACE did not affect mycorrhizal colonization of P. x euramericana.
- Taxon
- P. x euramericanaPopulus ×canadensise0
- Treatment
- FACE treatmente0
- Outcome
- colonization of the root systeme0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“colonization of the root system of P. x euramericana was not affected by FACE treatment”
The same questions in other papers
co2 · growth · Populus (poplar)Results differ
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