Abstract
A seed mixture of Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds. was grown in spaghnum peat or sandy soil in six growth chambers placed in a greenhouse compartment. Two different experiments were performed. Increasing the CO2 concentration from 375 to 740 μmol mol−1 increased the total dry weight of the grass mixture by about 30%, while an increase in the O3 concentration from < 10 to 50 nmol mol−1 decreased the dry weight by 18% as a mean in both experiments. The relative dry weights of the three species were not significantly affected by elevated CO2 concentrations at low O3, while Lolium increased its relative dry weight at high O3concentrations at low CO2 on the expenditure of Phleum dry weight. CO2 enrichment counteracted some of this O3 effect. No significant interaction between CO2 concentration and temperature (14 and 19°C mean temperature) was found with respect to the dry weights of the three species. The soil type had generally no influence on the effect of CO2 and O3. However, plant growth was significantly slower in sandy soil than in peat.
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Claims 9
Claim · model-written summary
Elevated CO2 increased grass mixture total dry weight by about 30%.
- Taxon
- Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.
Lolium perenne
Festuca pratensis
Phleum pratensee0 - Treatment
- CO2 concentration from 375 to 740 μmol mol−1e1
- Outcome
- total dry weight of the grass mixturee1
- Direction
- increasede1
- Value
- about 30%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.”
e1“Increasing the CO2 concentration from 375 to 740 μmol mol−1 increased the total dry weight of the grass mixture by about 30%”
Claim · model-written summary
Higher ozone decreased grass mixture dry weight by 18%.
- Taxon
- Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.Lolium perenneFestuca pratensisPhleum pratensee0
- Treatment
- O3 concentration from < 10 to 50 nmol mol−1e1
- Outcome
- dry weighte1
- Direction
- decreasede1
- Value
- 18%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.”
e1“an increase in the O3 concentration from < 10 to 50 nmol mol−1 decreased the dry weight by 18% as a mean in both experiments”
Claim · model-written summary
Elevated CO2 at low ozone did not significantly affect the three species relative dry weights.
- Taxon
- Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.Lolium perenneFestuca pratensisPhleum pratensee0
- Treatment
- elevated CO2 concentrationse1
- Outcome
- relative dry weights of the three speciese1
- Direction
- not significantly affectede1
- Qualifier
- at low O3e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.”
e1“The relative dry weights of the three species were not significantly affected by elevated CO2 concentrations at low O3”
Claim · model-written summary
Lolium relative dry weight increased at high ozone and low CO2.
LoliumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lolium perenne L.”
e1“Lolium increased its relative dry weight at high O3concentrations at low CO2 on the expenditure of Phleum dry weight”
Claim · model-written summary
Phleum relative dry weight decreased under high ozone and low CO2.
.jpg?width=60){kind=small}
PhleumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Phleum pratense L.”
e1“Lolium increased its relative dry weight at high O3concentrations at low CO2 on the expenditure of Phleum dry weight”
Claim · model-written summary
CO2 enrichment counteracted some of the ozone-related relative biomass effect.
- Taxon
- Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.Lolium perenneFestuca pratensisPhleum pratensee0
- Treatment
- CO2 enrichmente1
- Outcome
- O3 effecte1
- Direction
- counteractede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.”
e1“CO2 enrichment counteracted some of this O3 effect”
e2“Lolium increased its relative dry weight at high O3concentrations at low CO2 on the expenditure of Phleum dry weight”
Claim · model-written summary
No significant CO2-by-temperature interaction was found for species dry weights.
- Taxon
- Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.Lolium perenneFestuca pratensisPhleum pratensee0
- Treatment
- CO2 concentration and temperature (14 and 19°C mean temperature)e1
- Outcome
- dry weights of the three speciese1
- Direction
- No significant interactione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.”
e1“No significant interaction between CO2 concentration and temperature (14 and 19°C mean temperature) was found with respect to the dry weights of the three species”
Claim · model-written summary
Soil type generally did not influence CO2 and ozone effects.
- Taxon
- Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.Lolium perenneFestuca pratensisPhleum pratensee0
- Outcome
- effect of CO2 and O3e1
- Direction
- no influencee1
- Setting
- soil typee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.”
e1“The soil type had generally no influence on the effect of CO2 and O3”
Claim · model-written summary
Grass growth was significantly slower in sandy soil than peat.
- Taxon
- Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.Lolium perenneFestuca pratensisPhleum pratensee0
- Treatment
- sandy soile1
- Outcome
- plant growthe1
- Direction
- slowere1
- Comparator
- peate1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phleum pratense L., Lolium perenne L. and Festuca pratensis Huds.”
e1“plant growth was significantly slower in sandy soil than in peat”
The same questions in other papers
co2 · growth · Phleum pratense (timothy)Results differ
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
co2 · growth · Lolium perenne (perennial ryegrass)Positive and negative results
8 papers in the same direction as this paper · 5 in the opposite direction
- positive
- no effect
- no effect
10 papers more in this group
See all 14 papers →co2 · growth · Festuca pratensis (meadow ryegrass)Results agree
1 paper in the same direction as this paper
- positive
ozone · growth · Lolium perenne (perennial ryegrass)Results agree
1 paper in the same direction as this paper
- negative
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.