Claim · model-written summary
At 0.10 ppm ozone, root/shoot ratio decreased as rain pH decreased.
- Taxon
- White ash
Fraxinus americanat0 - Treatment
- rain pHe1
- Outcome
- root/shoot ratioe1
- Direction
- lesse1
- Qualifier
- 0.10 ppm O 3e1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“White ash seedling growth response”
e1“significantly less [Formula: see text] and root/shoot ratio at 0.10 ppm O 3 as rain pH decreased”
Title
White ash seedling growth response to ozone and simulated acid rain
A. H. Chappelka III; B. I. Chevone Canadian Journal of Forest Research 1986. doi:10.1139/x86-139
Other claims from this paper (11)
- Intervention effect Increasing ozone significantly decreased root, leaf and total dry weights of white ash seedlings.
- Intervention effect Increasing ozone significantly decreased total height increase and root/shoot ratio.
- Intervention effect Increasing ozone significantly decreased mean relative growth rates of the total plant, stem, root and leaves.
- Intervention effect Increasing rain acidity significantly decreased root dry weight.
- Intervention effect Increasing rain acidity significantly decreased root/shoot ratio.
- Association Rain pH had a significant quadratic association with all aboveground growth variables.
- Intervention effect Growth was greatest at rain pH 4.3 and least at pH 5.6 or 3.0.
- Intervention effect Timing of rain application relative to ozone did not significantly alter any growth variable.
- Observation Visible ozone or rain symptoms were seen on 54-61% of seedlings per treatment.
- Intervention effect The combined ozone and rain treatment at 0.05 ppm significantly decreased root dry weight.
- Intervention effect The combined ozone and rain treatment at 0.05 ppm significantly decreased root/shoot ratio.