Abstract
Rising temperature and tropospheric ozone (O(3)) concentrations are likely to affect carbon assimilation processes and thus the carbon sink strength of trees. In this study, we investigated the joint action of elevated ozone and temperature on silver birch (Betula pendula) and European aspen (Populus tremula) saplings in field conditions by combining free-air ozone exposure (1.2 × ambient) and infrared heaters (ambient +1.2 °C). At leaf level measurements, elevated ozone decreased leaf net photosynthesis (P(n)), while the response to elevated temperature was dependent on leaf position within the foliage. This indicates that leaf position has to be taken into account when leaf level data are collected and applied. The ozone effect on P(n) was partly compensated for at elevated temperature, showing an interactive effect of the treatments. In addition, the ratio of photosynthesis to stomatal conductance (P(n)/g(s) ratio) was decreased by ozone, which suggests decreasing water use efficiency. At the plant level, the increasing leaf area at elevated temperature resulted in a considerable increase in photosynthesis and growth in both species.
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Claims 6
Claim · model-written summary
Elevated ozone decreased leaf net photosynthesis relative to ambient ozone.
- Taxon
- Betula pendula and Populus tremula
Betula pendula
Populus tremulat0 - Treatment
- elevated ozonee0
- Outcome
- leaf net photosynthesis (P(n))e0
- Direction
- decreasede0
- Comparator
- ambiente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vertical profiles reveal impact of ozone and temperature on carbon assimilation of Betula pendula and Populus tremula”
e0“elevated ozone decreased leaf net photosynthesis (P(n))”
e1“free-air ozone exposure (1.2 × ambient)”
Claim · model-written summary
The response to elevated temperature depended on leaf position within the foliage.
- Taxon
- Betula pendula and Populus tremulaBetula pendulaPopulus tremulat0
- Treatment
- elevated temperaturee2
- Outcome
- response to elevated temperaturee2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vertical profiles reveal impact of ozone and temperature on carbon assimilation of Betula pendula and Populus tremula”
e2“while the response to elevated temperature was dependent on leaf position within the foliage”
Claim · model-written summary
The ozone effect on leaf net photosynthesis was partly compensated at elevated temperature.
- Taxon
- Betula pendula and Populus tremulaBetula pendulaPopulus tremulat0
- Treatment
- elevated temperaturee3
- Outcome
- ozone effect on P(n)e3
- Direction
- partly compensatede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vertical profiles reveal impact of ozone and temperature on carbon assimilation of Betula pendula and Populus tremula”
e3“The ozone effect on P(n) was partly compensated for at elevated temperature”
Claim · model-written summary
Ozone decreased the ratio of photosynthesis to stomatal conductance.
- Taxon
- Betula pendula and Populus tremulaBetula pendulaPopulus tremulat0
- Treatment
- ozonee4
- Outcome
- ratio of photosynthesis to stomatal conductance (P(n)/g(s) ratio)e4
- Direction
- decreasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vertical profiles reveal impact of ozone and temperature on carbon assimilation of Betula pendula and Populus tremula”
e4“the ratio of photosynthesis to stomatal conductance (P(n)/g(s) ratio) was decreased by ozone”
Claim · model-written summary
Ozone suggests decreasing water use efficiency in birch and aspen.
- Taxon
- Betula pendula and Populus tremulaBetula pendulaPopulus tremulat0
- Treatment
- ozonee4
- Outcome
- water use efficiencye4
- Direction
- decreasinge4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vertical profiles reveal impact of ozone and temperature on carbon assimilation of Betula pendula and Populus tremula”
e4“the ratio of photosynthesis to stomatal conductance (P(n)/g(s) ratio) was decreased by ozone, which suggests decreasing water use efficiency”
Claim · model-written summary
At elevated temperature, increased leaf area was associated with increased photosynthesis and growth in both species.
- Taxon
- Betula pendula and Populus tremulaBetula pendulaPopulus tremulat0
- Treatment
- elevated temperaturee5
- Outcome
- photosynthesis and growthe5
- Direction
- increasee5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vertical profiles reveal impact of ozone and temperature on carbon assimilation of Betula pendula and Populus tremula”
e5“the increasing leaf area at elevated temperature resulted in a considerable increase in photosynthesis and growth in both species”
The same questions in other papers
ozone · physiology: photosynthesis · Populus tremula (European aspen)Results agree
1 paper in the same direction as this paper
- negative
ozone · physiology: photosynthesis · Betula pendula (white birch)Results agree
4 papers in the same direction as this paper
- negative
- negative
- negative
1 paper more in this group
See all 5 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.