Abstract
The effects of elevated CO₂ and interaction effects between elevated CO₂ and nutrient supplies on growth and the C/N ratio of European beech (Fagus sylvatica L.) saplings were studied. One-year-old beech saplings were grown in a greenhouse at ambient (385 ppm) and elevated CO₂ (770 ppm/950 ppm), with or without fertilization for two growing seasons. In this study, emphasis is placed on the combined fertilization including phosphorus, potassium and nitrogen with two level of elevated CO₂. The fertilized plants grown under elevated CO₂ had the highest net leaf photosynthesis rate (Ac). The saplings grown under elevated CO₂ had a significantly lower stomatal conductance (gs) than saplings grown under ambient air. No interaction effect was found between elevated CO₂ and fertilization on Ac. A interaction effect between CO₂ and fertilization, as well as between date and fertilization and between date and CO₂ was detected on gs. Leaf chlorophyll content index (CCI) and leaf nitrogen content were strongly positively correlated to each other and both of them decreased under elevated CO₂. At the end of both growing seasons, stem dry weight was greater under elevated CO₂ and root dry weight was not affected by different treatments. No interaction effect was detected between elevated CO₂ and nutrient supplies on the dry weight of different plant tissues (stems and roots). However, elevated CO₂ caused a significant decrease in the nitrogen content of plant tissues. Nitrogen reduction in the leaves under elevated CO₂ was about 10% and distinctly higher than in the stem and root. The interaction effect of elevated CO₂ and fertilization on C/N ratio in plants tissues was significant. The results led to the conclusion that photosynthesis and the C/N ratio increased while stomatal conductance and leaf nitrogen content decreased under elevated CO₂ and nutrient-limited conditions. In general, under nutrient-limited conditions, the plant responses to elevated CO₂ were decreased.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 20
Claim · model-written summary
Fertilized saplings under elevated CO₂ had the highest net leaf photosynthesis rate.
- Taxon
- European Beech
Fagus sylvaticat0 - Treatment
- fertilized plants grown under elevated CO₂e0
- Outcome
- net leaf photosynthesis ratee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fertilized plants grown under elevated CO₂ had the highest net leaf photosynthesis rate (Ac).”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Elevated CO₂ significantly lowered stomatal conductance relative to ambient air.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- elevated CO₂e0
- Outcome
- stomatal conductancee0
- Direction
- lowere0
- Comparator
- ambient aire0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The saplings grown under elevated CO₂ had a significantly lower stomatal conductance (gs) than saplings grown under ambient air.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Elevated CO₂ and fertilization did not interact for photosynthesis rate.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- elevated CO₂ and fertilizatione0
- Outcome
- Ace0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No interaction effect was found between elevated CO₂ and fertilization on Ac.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
CO₂ and fertilization interacted for stomatal conductance.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- CO₂ and fertilizatione0
- Outcome
- gse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A interaction effect between CO₂ and fertilization, as well as between date and fertilization and between date and CO₂ was detected on gs.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Date and fertilization interacted for stomatal conductance.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- date and fertilizatione0
- Outcome
- gse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A interaction effect between CO₂ and fertilization, as well as between date and fertilization and between date and CO₂ was detected on gs.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Date and CO₂ interacted for stomatal conductance.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- date and CO₂e0
- Outcome
- gse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A interaction effect between CO₂ and fertilization, as well as between date and fertilization and between date and CO₂ was detected on gs.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Leaf chlorophyll content index and leaf nitrogen content were strongly positively correlated.
- Taxon
- European BeechFagus sylvaticat0
- Compound
- nitrogene0
- Outcome
- Leaf chlorophyll content index (CCI)e0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf chlorophyll content index (CCI) and leaf nitrogen content were strongly positively correlated to each other and both of them decreased under elevated CO₂.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Leaf chlorophyll content index (CCI) decreased under elevated CO₂.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- elevated CO₂e0
- Outcome
- Leaf chlorophyll content index (CCI)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf chlorophyll content index (CCI) and leaf nitrogen content were strongly positively correlated to each other and both of them decreased under elevated CO₂.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
leaf nitrogen content decreased under elevated CO₂.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- elevated CO₂e0
- Outcome
- leaf nitrogen contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf chlorophyll content index (CCI) and leaf nitrogen content were strongly positively correlated to each other and both of them decreased under elevated CO₂.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Elevated CO₂ increased stem dry weight at the end of both seasons.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- elevated CO₂e0
- Outcome
- stem dry weighte0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the end of both growing seasons, stem dry weight was greater under elevated CO₂ and root dry weight was not affected by different treatments.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Different treatments did not affect root dry weight.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- different treatmentse0
- Outcome
- root dry weighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the end of both growing seasons, stem dry weight was greater under elevated CO₂ and root dry weight was not affected by different treatments.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Elevated CO₂ and nutrient supplies did not interact for stems dry weight.
- Taxon
- European BeechFagus sylvaticat0
- Organ / stage
- stemse0
- Treatment
- elevated CO₂ and nutrient suppliese0
- Outcome
- dry weighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No interaction effect was detected between elevated CO₂ and nutrient supplies on the dry weight of different plant tissues (stems and roots).”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Elevated CO₂ and nutrient supplies did not interact for roots dry weight.
- Taxon
- European BeechFagus sylvaticat0
- Organ / stage
- rootse0
- Treatment
- elevated CO₂ and nutrient suppliese0
- Outcome
- dry weighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No interaction effect was detected between elevated CO₂ and nutrient supplies on the dry weight of different plant tissues (stems and roots).”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Elevated CO₂ significantly decreased plant tissue nitrogen content.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- elevated CO₂e0
- Outcome
- nitrogen content of plant tissuese0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, elevated CO₂ caused a significant decrease in the nitrogen content of plant tissues.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Elevated CO₂ reduced leaf nitrogen by about 10%, more than in stem and root.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- elevated CO₂e0
- Outcome
- Nitrogen reduction in the leavese0
- Direction
- reductione0
- Value
- 10%e0
- Qualifier
- distinctly higher than in the stem and roote0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen reduction in the leaves under elevated CO₂ was about 10% and distinctly higher than in the stem and root.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
Elevated CO₂ and fertilization significantly interacted for tissue C/N ratio.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- elevated CO₂ and fertilizatione0
- Outcome
- C/N ratio in plants tissuese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The interaction effect of elevated CO₂ and fertilization on C/N ratio in plants tissues was significant.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
photosynthesis increased under elevated CO₂ and nutrient-limited conditions.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- elevated CO₂ and nutrient-limited conditionse0
- Outcome
- photosynthesise0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results led to the conclusion that photosynthesis and the C/N ratio increased while stomatal conductance and leaf nitrogen content decreased under elevated CO₂ and nutrient-limited conditions.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
C/N ratio increased under elevated CO₂ and nutrient-limited conditions.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- elevated CO₂ and nutrient-limited conditionse0
- Outcome
- C/N ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results led to the conclusion that photosynthesis and the C/N ratio increased while stomatal conductance and leaf nitrogen content decreased under elevated CO₂ and nutrient-limited conditions.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
stomatal conductance decreased under elevated CO₂ and nutrient-limited conditions.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- elevated CO₂ and nutrient-limited conditionse0
- Outcome
- stomatal conductancee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results led to the conclusion that photosynthesis and the C/N ratio increased while stomatal conductance and leaf nitrogen content decreased under elevated CO₂ and nutrient-limited conditions.”
t0“European Beech (Fagus sylvatica L.)”
Claim · model-written summary
leaf nitrogen content decreased under elevated CO₂ and nutrient-limited conditions.
- Taxon
- European BeechFagus sylvaticat0
- Treatment
- elevated CO₂ and nutrient-limited conditionse0
- Outcome
- leaf nitrogen contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results led to the conclusion that photosynthesis and the C/N ratio increased while stomatal conductance and leaf nitrogen content decreased under elevated CO₂ and nutrient-limited conditions.”
t0“European Beech (Fagus sylvatica L.)”
The same questions in other papers
co2 · physiology: gas exchange · Fagus sylvatica (European beech)Positive and negative results
2 in the opposite direction
- positive
- positive
co2 · growth · Fagus sylvatica (European beech)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
4 papers more in this group
See all 8 papers →co2 · physiology: pigments · Fagus sylvatica (European beech)Results agree
1 paper in the same direction as this paper
- negative
co2 · nutrient: content · Fagus sylvatica (European beech)Results agree
1 paper in the same direction as this paper
- no effect
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.