Abstract
Summary Plant response to elevated atmospheric CO 2 may depend on the carbon sink strength, determined by the availability of resources other than CO 2 , and the developmental stage. In a 2‐yr field experiment with model swards of Lolium perenne , the effect of CO 2 enrichment (FACE) on yield and allocation of dry mass (DM) and N were examined under three N fertilization treatments during vegetative and reproductive growth. During vegetative growth, in the highest N treatment, the greatest increase in DM yield occurred at elevated CO 2 ; there was no change in DM allocation. By contrast, at low N, residual biomass, but not yield, increased under CO 2 enrichment, and the tillers were shorter. During reproductive growth, under CO 2 enrichment DM yield increased similarly across all N treatments; there was no change in DM and N partitioning. The mean weight and height of the reproductive tillers increased. At high N availability, or during reproductive growth, L. perenne swards overcome carbon‐sink limitation and show a strong yield response to elevated CO 2 . Biomass allocation and the height of the plants, in response to elevated CO 2 , clearly depend on N fertilization and developmental stage.
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Claims 8
Claim · model-written summary
At high nitrogen during vegetative growth, elevated CO2 gave the greatest increase in dry matter yield.
- Taxon
- Lolium perenne
Lolium perennet0 - Treatment
- elevated CO 2e0
- Outcome
- DM yielde0
- Direction
- greatest increasee0
- Qualifier
- highest N treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During vegetative growth, in the highest N treatment, the greatest increase in DM yield occurred at elevated CO 2”
t0“Lolium perenne”
Claim · model-written summary
Dry matter allocation did not change at high nitrogen during vegetative growth under elevated CO2.
- Taxon
- Lolium perenneLolium perennet0
- Treatment
- elevated CO2t1
- Outcome
- DM allocatione0
- Direction
- no changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no change in DM allocation”
t0“Lolium perenne”
t1“elevated CO2”
Claim · model-written summary
At low nitrogen, CO2 enrichment increased residual biomass.
- Taxon
- Lolium perenneLolium perennet0
- Treatment
- CO 2 enrichmente0
- Outcome
- residual biomasse0
- Direction
- increasede0
- Qualifier
- low Ne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at low N, residual biomass, but not yield, increased under CO 2 enrichment”
t0“Lolium perenne”
Claim · model-written summary
At low nitrogen, CO2 enrichment did not increase yield.
- Taxon
- Lolium perenneLolium perennet0
- Treatment
- CO 2 enrichmente0
- Outcome
- yielde0
- Qualifier
- low Ne0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at low N, residual biomass, but not yield, increased under CO 2 enrichment”
t0“Lolium perenne”
Claim · model-written summary
At low nitrogen under CO2 enrichment, tillers were shorter.
- Taxon
- Lolium perenneLolium perennet0
- Treatment
- CO 2 enrichmente0
- Outcome
- tillerse0
- Direction
- shortere0
- Qualifier
- low Ne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at low N, residual biomass, but not yield, increased under CO 2 enrichment, and the tillers were shorter”
t0“Lolium perenne”
Claim · model-written summary
During reproductive growth, CO2 enrichment increased dry matter yield similarly across nitrogen treatments.
- Taxon
- Lolium perenneLolium perennet0
- Treatment
- CO 2 enrichmente0
- Outcome
- DM yielde0
- Direction
- increasede0
- Qualifier
- across all N treatmentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During reproductive growth, under CO 2 enrichment DM yield increased similarly across all N treatments”
t0“Lolium perenne”
Claim · model-written summary
During reproductive growth, CO2 enrichment did not change dry matter and nitrogen partitioning.
- Taxon
- Lolium perenneLolium perennet0
- Treatment
- elevated CO2t1
- Outcome
- DM and N partitioninge0
- Direction
- no changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no change in DM and N partitioning”
t0“Lolium perenne”
t1“elevated CO2”
Claim · model-written summary
Under CO2 enrichment, reproductive tiller mean weight and height increased.
- Taxon
- Lolium perenneLolium perennet0
- Treatment
- CO 2 enrichmente1
- Outcome
- mean weight and height of the reproductive tillerse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean weight and height of the reproductive tillers increased”
t0“Lolium perenne”
e1“under CO 2 enrichment DM yield increased”
The same questions in other papers
co2 · yield · Lolium perenne (perennial ryegrass)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
2 papers more in this group
See all 6 papers →co2 · growth · Lolium perenne (perennial ryegrass)Positive and negative results
8 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- no effect
- positive
10 papers more in this group
See all 14 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.