Claim · model-written summary
Ponderosa pine had the highest absolute biomass growth rate over three growing seasons in any given light environment.
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingValueQualifier
Verbatim
e0“ponderosa pine had the highest absolute biomass growth rate over three growing seasons in any given light environment”
Title
Chen, Han Y. H. cIRcle (University of British Columbia) 2009. doi:10.14288/1.0088171
Other claims from this paper (19)
- Observation In high light environments, lodgepole pine saplings had greater terminal and lateral increment than Douglas-fir saplings.
- Intervention effect With decreasing light availability, terminal increment, mean lateral increment and total lateral increment decreased in both lodgepole pine and Douglas-fir.
- Observation With decreasing light, lodgepole pine had a greater decrease in lateral growth than Douglas-fir.
- Observation With decreasing light, the ratio of mean lateral to terminal increment did not change in lodgepole pine but significantly increased in Douglas-fir.
- Observation With decreasing light, the ratio of total lateral to terminal increment decreased in lodgepole pine but increased in Douglas-fir.
- Observation With decreasing light, specific leaf area increased in both lodgepole pine and Douglas-fir, with a marginally greater increase in Douglas-fir.
- Observation Douglas-fir always had a greater specific leaf area than lodgepole pine.
- Intervention effect Induction times to reach 50 and 90% of steady-state net photosynthetic rate were shorter in understory-grown than in open-grown Douglas-fir branches.
- Intervention effect On a per unit leaf area basis, understory-grown Douglas-fir branches had a lower dark respiration rate than open-grown branches.
- Intervention effect On a per unit leaf area basis, understory-grown Douglas-fir branches had higher net photosynthetic rates at low PPFDs but lower rates at high PPFDs than open-grown branches.
- Intervention effect On a dry leaf mass basis, dark respiration rates did not differ between understory-grown and open-grown Douglas-fir branches.
- Intervention effect Net photosynthetic rates of understory-grown Douglas-fir branches were equal to or higher than those of open-grown branches at all PPFDs.
- Intervention effect After three growing seasons, survival of planted ponderosa pine and western larch seedlings decreased with decreasing light availability from intermediate to low light.
- Intervention effect Survival of Douglas-fir and Engelmann spruce seedlings did not vary among light environments.
- Observation In low light environments, survival increased in the order western larch, ponderosa pine, Douglas-fir, Engelmann spruce.
- Intervention effect With decreasing light availability, all study species except western larch had decreased height growth, with Engelmann spruce showing the greatest decrease.
- Intervention effect With decreasing light availability, diameter growth decreased for all study species, with Douglas-fir showing the greatest decrease.
- Intervention effect With decreasing light availability, total biomass growth decreased for all study species, with no difference in the extent of decrease in absolute and relative biomass growth rates among the three evergreen conifers.
- Intervention effect The ratio of absolute above- to below-ground biomass and specific leaf area varied with light environments in Douglas-fir and Engelmann spruce but not in ponderosa pine and western larch seedlings.