Abstract
This paper investigates the possible contribution of Short Rotation Cultures (SRC) to carbon sequestration in both current and elevated atmospheric CO2 concentrations ([CO2]). A dense poplar plantation (1 x 1 m) was exposed to a [CO2] of 550 ppm in Central Italy using the free-air CO2 enrichment (FACE) technique. Three species of Populus were examined, namely P. alba L., P. nigra L. and P. x euramericana Dode (Guinier). Aboveground woody biomass of trees exposed to elevated [CO2] for three growing seasons increased by 15 to 27%, depending on species. As a result, light-use efficiency increased. Aboveground biomass allocation was unaffected, and belowground biomass also increased under elevated [CO2] conditions, by 22 to 38%. Populus nigra, with total biomass equal to 62.02 and 72.03 Mg ha-1 in ambient and elevated [CO2], respectively, was the most productive species, although its productivity was stimulated least by atmospheric CO2 enrichment. There was greater depletion of inorganic nitrogen from the soil after three growing seasons in elevated [CO2], but no effect of [CO2] on stem wood density, which differed significantly only among species.
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Claims 9
Claim · model-written summary
Elevated CO2 increased aboveground woody biomass by 15 to 27% after three seasons.
- Treatment
- elevated [CO2]e0
- Outcome
- Aboveground woody biomasse0
- Direction
- increasede0
- Value
- 15 to 27%e0
- Qualifier
- depending on speciese0
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e0“Aboveground woody biomass of trees exposed to elevated [CO2] for three growing seasons increased by 15 to 27%, depending on species”
Claim · model-written summary
Light-use efficiency increased with elevated CO2.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e0“As a result, light-use efficiency increased”
e1“Aboveground woody biomass of trees exposed to elevated [CO2] for three growing seasons increased by 15 to 27%, depending on species”
Claim · model-written summary
Aboveground biomass allocation was unaffected by elevated CO2.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e0“Aboveground biomass allocation was unaffected”
e1“Belowground biomass also increased under elevated [CO2] conditions”
Claim · model-written summary
Belowground biomass increased 22 to 38% under elevated CO2.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e0“belowground biomass also increased under elevated [CO2] conditions, by 22 to 38%”
Claim · model-written summary
Populus nigra was the most productive species, with 62.02 and 72.03 Mg ha-1 total biomass under ambient and elevated CO2.
- Taxon
- Populus nigra
Populus nigrae0 - Outcome
- total biomasse0
- Direction
- most productivee0
- Value
- 62.02 and 72.03 Mg ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Populus nigra, with total biomass equal to 62.02 and 72.03 Mg ha-1 in ambient and elevated [CO2], respectively, was the most productive species”
Claim · model-written summary
Populus nigra had the least productivity stimulation from CO2 enrichment.
- Taxon
- Populus nigraPopulus nigrae0
- Treatment
- atmospheric CO2 enrichmente0
- Outcome
- productivitye0
- Direction
- stimulated leaste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Populus nigra, with total biomass equal to 62.02 and 72.03 Mg ha-1 in ambient and elevated [CO2], respectively, was the most productive species, although its productivity was stimulated least by atmospheric CO2 enrichment”
Claim · model-written summary
Soil inorganic nitrogen depletion was greater under elevated CO2.
Not reportedTaxonComparator
Verbatim
t0“poplar”
e0“There was greater depletion of inorganic nitrogen from the soil after three growing seasons in elevated [CO2]”
Claim · model-written summary
CO2 had no effect on stem wood density.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e0“no effect of [CO2] on stem wood density”
Claim · model-written summary
Stem wood density differed significantly among species.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“poplar”
e0“stem wood density, which differed significantly only among species”
The same questions in other papers
co2 · growth · Populus (poplar)Results differ
17 papers in the same direction as this paper · 1 in the opposite direction
- positive
- positive
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15 papers more in this group
See all 19 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.