Claim · model-written summary
Productivity from a single 8-year harvest cycle was also highest at 61 x 122 cm spacing.
- Taxon
- black Cottonwood
Populus trichocarpae0 - Treatment
- 61 × 122 cm spacinge1
- Outcome
- Productivity from a single 8-year harvest cyclee1
- Direction
- higheste1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“show no productivity advantage for very short rotations of black Cottonwood”
e1“Productivity from a single 8-year harvest cycle was also highest at 61 × 122 cm spacing”
Title
Effect of harvest cycle and spacing on productivity of black cottonwood in intensive culture
Paul Heilman; D. V. Peabody Jr. Canadian Journal of Forest Research 1981. doi:10.1139/x81-016
Other claims from this paper (9)
- Intervention effect Very short rotations gave no productivity advantage in black Cottonwood.
- Intervention effect Harvest cycles less than 8 years reduced productivity of black Cottonwood.
- Intervention effect At one site the combined yield of two 4-year harvests was 75% of one 8-year harvest.
- Intervention effect Mean annual dry biomass increment was 6.05 t/ha for two 4-year harvests versus 8.05 t/ha for one 8-year harvest.
- Intervention effect At the second site the second 2-year harvest had higher annual dry biomass increment (8.9) than the first 2-year harvest (5.8).
- Intervention effect At the second site the third harvest (9.7 t/ha) had higher annual dry biomass increment than the first 2-year harvest.
- Observation The second and third harvests at the second site did not differ significantly in productivity.
- Intervention effect Highest productivity over 8 years for 2- and 4-year harvest cycles was obtained with 30 x 30 to 61 x 122 cm spacings.
- Association The declining effect of spacing on productivity of black Cottonwood increases with the age of the planting.