Abstract
summary Plant species typical of semi-natural grasslands were tested for their sensitivity to long-term ozone eects on growth under two irrigation regimes, and the relationship between ozone sensitivity, relative growth rate, and plant strategy was analysed. Individuals of 24 grasses, herbs and legumes were grown in pots and exposed for two seasons to four levels of ozone in open-top chambers: (a) CF, charcoal-filtered air, (b) CFAA, charcoal-filtered air plus ozone to match ambient levels, (c) CF›, charcoal-filtered air plus ozone added to match 1.5 times ambient levels and (d) CF››, charcoal-filtered air with ozone added to match twice ambient levels during selected episodes of 7‐13 d. During the ozone episodes, one half of the plants received reduced irrigation (dry treatment) while the rest was kept well watered (wet treatment). The eect of ozone on the relative growth rate was determined during the initial growth period during the first season. Above-ground plant dry weight was determined three times during each season, and stubble dry weight at the end of the experiment. In most species, the eect of ozone on relative growth rate was not significant, except in Centaurea jacea and Lychnis flos-cuculi for which a significant stimulation of relative growth rate was found. There was a significant negative relationship between percentage relative growth rate and relative growth rate measured in the CF treatment, indicating that in species growing faster in clean air relative growth rate tended to be more sensitive to ozone than in slowergrowing species. After the first re-growth period during the first season, a significant eect of ozone on aboveground biomass was found in five species, i.e. a decrease in Chrysanthemum leucanthemum, Trifolium pratense and
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Claims 6
Claim · model-written summary
Ozone had no significant effect on relative growth rate in most species.
Not reportedComparatorDirection
Verbatim
e0“In most species, the eect of ozone on relative growth rate was not significant”
Claim · model-written summary
Ozone significantly stimulated relative growth rate in Centaurea jacea.
- Taxon
- Centaurea jacea
Centaurea jaceae0 - Outcome
- relative growth ratee0
- Direction
- stimulatione0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“except in Centaurea jacea and Lychnis flos-cuculi for which a significant stimulation of relative growth rate was found”
Claim · model-written summary
Ozone significantly stimulated relative growth rate in Lychnis flos-cuculi.
- Taxon
- Lychnis flos-cuculi
Silene flos-cuculie0 - Outcome
- relative growth ratee0
- Direction
- stimulatione0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“except in Centaurea jacea and Lychnis flos-cuculi for which a significant stimulation of relative growth rate was found”
Claim · model-written summary
Faster growth in clean air was associated with greater ozone sensitivity.
- Outcome
- percentage relative growth ratee0
- Direction
- negative relationshipe0
- Comparator
- relative growth rate measured in the CF treatmente0
Not reportedTaxon
Verbatim
e0“There was a significant negative relationship between percentage relative growth rate and relative growth rate measured in the CF treatment”
Claim · model-written summary
Ozone decreased aboveground biomass in Chrysanthemum leucanthemum.
- Taxon
- Chrysanthemum leucanthemum
Leucanthemum vulgaree0 - Treatment
- ozonee0
- Outcome
- aboveground biomasse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant eect of ozone on aboveground biomass was found in five species, i.e. a decrease in Chrysanthemum leucanthemum”
Claim · model-written summary
Ozone decreased aboveground biomass in Trifolium pratense.
- Taxon
- Trifolium pratense
Trifolium pratensee0 - Treatment
- ozonee0
- Outcome
- aboveground biomasse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant eect of ozone on aboveground biomass was found in five species, i.e. a decrease in Chrysanthemum leucanthemum, Trifolium pratense”
The same questions in other papers
ozone · growth · Leucanthemum vulgareResults agree
1 paper in the same direction as this paper
- negative
ozone · growth · Trifolium pratense (red clover)Results agree
3 papers in the same direction as this paper
- negative
- negative
- 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.