Abstract
Two hybrid poplar (Populus) clones (the fast-growing clone Beaupré (P. trichocarpa Torr. and Gray x P. deltoides Bartr. ex Marsh.) and the slow-growing clone Robusta (P. deltoides Bartr. ex Marsh. x P. nigra L.)) were grown from hardwood cuttings for one or two growing seasons (1993-1994) in either ambient or elevated (= ambient + 350 micro mol mol(-1)) CO(2) in open-top chambers at the University of Antwerpen. Both clones responded positively to the elevated CO(2) treatment with increased stem volume and aboveground biomass production; however, the clones exhibited different response strategies to the elevated CO(2) treatment, and the responses varied with cutting age and duration of exposure. Clone Beaupré responded to the elevated CO(2) treatment with increases in leaf area and leaf area index during both the first and second growing seasons, but little increase in height growth. Clone Robusta exhibited increased height growth, leaf biomass and total leaf nitrogen content in response to elevated CO(2), but no increase in leaf area index. The elevated CO(2) treatment increased the total number of branches and total branch biomass in both clones during both growing seasons. At the end of the first growing season, woody stem biomass of the fast- and slow-growing clones was increased by 38 and 55%, respectively. At the end of the second growing season, stem volume was increased by 43% in clone Beaupré and by 58% in clone Robusta. The increase in stem volume was a result of the stimulation of both height and diameter growth in the slow-growing clone, whereas only height growth was stimulated in the fast-growing clone. In the fall of the first growing season, the average date of bud set in clone Robusta was advanced by 4 days in the elevated CO(2) treatment; there were no other significant effects of the elevated CO(2) treatment on bud set. The elevated CO(2) treatment enhanced leaf C/N ratios in both clones in both years.
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Claims 13
Claim · model-written summary
Both clones increased stem volume and aboveground biomass under elevated CO2.
- Taxon
- Populus hybridst0
- Treatment
- elevated CO(2) treatmente0
- Outcome
- stem volume and aboveground biomass productione0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Both clones responded positively to the elevated CO(2) treatment with increased stem volume and aboveground biomass production”
t0“Populus hybrids”
Claim · model-written summary
Beaupré increased leaf area and leaf area index in both seasons.
- Taxon
- Populus hybridst0
- Material
- Beauprée0
- Treatment
- elevated CO(2) treatmente0
- Outcome
- leaf area and leaf area indexe0
- Direction
- increasese0
- Qualifier
- both the first and second growing seasonse0
Not reportedComparator
Verbatim
e0“Clone Beaupré responded to the elevated CO(2) treatment with increases in leaf area and leaf area index during both the first and second growing seasons”
t0“Populus hybrids”
Claim · model-written summary
Beaupré had little increase in height growth.
- Taxon
- Populus hybridst0
- Material
- Beauprée1
- Treatment
- elevated CO(2) treatmente1
- Outcome
- height growthe0
- Direction
- little increasee0
Not reportedComparator
Verbatim
e0“little increase in height growth”
t0“Populus hybrids”
e1“Clone Beaupré responded to the elevated CO(2) treatment”
Claim · model-written summary
Robusta increased height growth, leaf biomass and total leaf nitrogen under elevated CO2.
- Taxon
- Populus hybridst0
- Material
- Robustae0
- Treatment
- elevated CO(2)e0
- Outcome
- height growth, leaf biomass and total leaf nitrogen contente0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Clone Robusta exhibited increased height growth, leaf biomass and total leaf nitrogen content in response to elevated CO(2)”
t0“Populus hybrids”
Claim · model-written summary
Robusta had no increase in leaf area index.
- Taxon
- Populus hybridst0
- Material
- Robustae1
- Treatment
- elevated CO(2)e1
- Outcome
- leaf area indexe0
- Direction
- no increasee0
Not reportedComparator
Verbatim
e0“no increase in leaf area index”
e1“Clone Robusta exhibited increased height growth, leaf biomass and total leaf nitrogen content in response to elevated CO(2)”
t0“Populus hybrids”
Claim · model-written summary
Both clones increased branch number and branch biomass in both seasons.
- Taxon
- Populus hybridst0
- Treatment
- elevated CO(2) treatmente0
- Outcome
- total number of branches and total branch biomasse0
- Direction
- increasede0
- Qualifier
- both growing seasonse0
Not reportedComparator
Verbatim
e0“elevated CO(2) treatment increased the total number of branches and total branch biomass in both clones during both growing seasons”
t0“Populus hybrids”
Claim · model-written summary
First-season woody stem biomass increased 38% in Beaupré.
Not reportedTreatmentComparator
Verbatim
e0“woody stem biomass of the fast- and slow-growing clones was increased by 38 and 55%, respectively”
e1“the fast-growing clone Beaupré”
t0“Populus hybrids”
Claim · model-written summary
First-season woody stem biomass increased 55% in Robusta.
Not reportedTreatmentComparator
Verbatim
e0“woody stem biomass of the fast- and slow-growing clones was increased by 38 and 55%, respectively”
e1“the slow-growing clone Robusta”
t0“Populus hybrids”
Claim · model-written summary
Second-season stem volume increased 43% in Beaupré.
Not reportedTreatmentComparator
Verbatim
e0“stem volume was increased by 43% in clone Beaupré”
t0“Populus hybrids”
Claim · model-written summary
Second-season stem volume increased 58% in Robusta.
Not reportedTreatmentComparator
Verbatim
e0“by 58% in clone Robusta”
e1“stem volume was increased”
t0“Populus hybrids”
Claim · model-written summary
Robusta bud set advanced four days under elevated CO2 in the first season.
- Taxon
- Populus hybridst0
- Material
- Robustae0
- Treatment
- elevated CO(2) treatmente0
- Outcome
- average date of bud sete0
- Direction
- advancede0
- Value
- 4 dayse0
Not reportedComparator
Verbatim
e0“average date of bud set in clone Robusta was advanced by 4 days in the elevated CO(2) treatment”
t0“Populus hybrids”
Claim · model-written summary
Other bud-set effects were not significant.
Not reportedComparatorDirection
Verbatim
e0“there were no other significant effects of the elevated CO(2) treatment on bud set”
t0“Populus hybrids”
Claim · model-written summary
Elevated CO2 increased leaf C/N ratios in both clones in both years.
- Taxon
- Populus hybridst0
- Treatment
- elevated CO(2) treatmente0
- Outcome
- leaf C/N ratiose0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“elevated CO(2) treatment enhanced leaf C/N ratios in both clones in both years”
t0“Populus hybrids”
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