Abstract
<ja:p>Height, basal diameter, diameter at breast height, bud burst, and leaf development were recorded in a 5-year-old hybrid aspen clonal trial. The field trial consisted of four aspen hybrid clones (Populus tremula x Populus tremuloides) and one local P. tremula seedling source. Phenological traits were observed in the 3rd year. Growth patterns were recorded during the 3rd and 4th years. Phenological traits were explored in relation to hybrid vigor expressed as growth traits. Differences were observed for phenological and growth traits among hybrid clones and P. tremula. The growth period varied from 143–158 days for the four hybrid clones, and was 112 days for P. tremula. The correlation between growth period and yield was highly significant. The annual growth rate of height for the hybrids was 4.2 cm per 7 days (2.4 for P. tremula) in the 3rd year and 6.4 cm per 7 days (2.9 for P. tremula) in the 4th year. After 5 years, mean estimated stem volume of the hybrids was 3.9 times that of P. tremula. Significant clone by year interaction was observed for height, diameter, and volume growth. The hybrid vigor seems to be mainly attributable to a longer growth period.</ja:p>
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Claims 8
Claim · model-written summary
Phenological and growth traits differed among hybrid clones and P. tremula.
- Taxon
- P. tremula
Populus tremulae0 - Material
- hybrid clonese0
- Outcome
- phenological and growth traitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences were observed for phenological and growth traits among hybrid clones and P. tremula”
Claim · model-written summary
The growth period was 143–158 days for hybrid clones versus 112 days for P. tremula.
- Taxon
- P. tremulaPopulus tremulae0
- Material
- four hybrid clonese0
- Outcome
- growth periode0
- Direction
- variede0
- Value
- 143–158 dayse0
- Qualifier
- 112 dayse0
- Comparator
- P. tremulae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth period varied from 143–158 days for the four hybrid clones, and was 112 days for P. tremula”
Claim · model-written summary
Growth period and yield were highly significantly correlated.
Not reportedDirection
Verbatim
e0“The correlation between growth period and yield was highly significant”
t0“hybrid aspen clones”
Claim · model-written summary
Hybrid height grew 4.2 cm per 7 days in year three versus 2.4 for P. tremula.
- Taxon
- P. tremulaPopulus tremulae0
- Material
- hybridse0
- Outcome
- annual growth rate of heighte0
- Value
- 4.2 cm per 7 dayse0
- Qualifier
- 2.4 for P. tremulae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The annual growth rate of height for the hybrids was 4.2 cm per 7 days (2.4 for P. tremula) in the 3rd year”
Claim · model-written summary
Hybrid height grew 6.4 cm per 7 days in year four versus 2.9 for P. tremula.
- Taxon
- P. tremulaPopulus tremulae0
- Material
- hybrid aspen clonest0
- Outcome
- heighte1
- Value
- 6.4 cm per 7 dayse0
- Qualifier
- 2.9 for P. tremulae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“6.4 cm per 7 days (2.9 for P. tremula) in the 4th year”
t0“Growth and phenology of hybrid aspen clones (Populus tremula L. x Populus tremuloides Michx.)”
e1“The annual growth rate of height for the hybrids was 4.2 cm per 7 days (2.4 for P. tremula) in the 3rd year”
Claim · model-written summary
After five years, mean estimated hybrid stem volume was 3.9 times that of P. tremula.
- Taxon
- P. tremulaPopulus tremulae0
- Material
- hybridse0
- Outcome
- mean estimated stem volumee0
- Value
- 3.9 timese0
- Comparator
- P. tremulae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 5 years, mean estimated stem volume of the hybrids was 3.9 times that of P. tremula”
Claim · model-written summary
Clone-by-year interaction was significant for height, diameter and volume growth.
Not reportedDirection
Verbatim
e0“Significant clone by year interaction was observed for height, diameter, and volume growth”
t0“hybrid aspen clones”
Claim · model-written summary
The authors attribute hybrid vigor mainly to a longer growth period.
Verbatim
e0“The hybrid vigor seems to be mainly attributable to a longer growth period”
t0“hybrid aspen clones”