Intervention effectmodel-written summary

Shoot/root and leaf/stem dry weight ratios were unaffected by ozone concentration.

A claim from Effects of low ozone concentrations on growth of Betula pubescens Ehrh., Betula verrucosa Ehrh. and Alnus incana (L.) Moench · 1990

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Shoot/root and leaf/stem dry weight ratios were unaffected by ozone concentration.

Taxon
Betula pubescens, Betula verrucosa and Alnus incanaBetula pendulaAlnus incanaBetula pubescense1
Treatment
ozone concentratione0
Outcome
Shoot/root and leaf/stem dry weight ratiose0
Direction
unaffectede0

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Betula pendula
Betula pendula · TaxonPercita at Flickr · CC BY-SA 2.0 · Wikimedia Commons ↗
Alnus incana
Alnus incana · TaxonNikanos · CC BY-SA 2.5 · Wikimedia Commons ↗
Betula pubescens
Betula pubescens · TaxonElfo del bosque · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Shoot/root and leaf/stem dry weight ratios were unaffected by ozone concentration”

✓ located verbatim in the source · abstract, characters 300–381
e1

“Seedlings of Betula pubescens, Betula verrucosa and Alnus incana were grown for 50 days”

✓ located verbatim in the source · abstract, characters 8–95

Title

Effects of low ozone concentrations on growth of Betula pubescens Ehrh., Betula verrucosa Ehrh. and Alnus incana (L.) Moench

LEIV M. MORTENSEN; ODDVAR SKRE New Phytologist 1990. doi:10.1111/j.1469-8137.1990.tb00934.x

Other claims from this paper (3)

Record rev-15ba09a8dddce8cd669062774ae6f45b0a8bad25db91081120275e10150d324a · schema claims-v0.9 · position 2 in the model’s answer

ozone · growth · Betula pendula (white birch)Results agree

9 papers: 0 positive, 9 negative or no effect

8 papers in the same direction as this claim

  1. negative
    Ozone exposure decreased new shoot growth and net assimilation rate in birch.

    Ozone exposure results in various carry‐over effects and prolonged reduction in biomass in birch (Betula pendula Roth) · 1999 · compared with ambient ozone

    Same directionCites this paper

  2. negative
    Ozone markedly reduced the root:shoot biomass ratio under low fertilization.

    Effect of fertilization on ozone‐induced changes in the metabolism of birch (Betula pendula) leaves · 1997

    Same direction

  3. negative
    Ozone exposure reduced the mean leaf size and the leaf area of birch relative to ambient ozone.

    Influence of nitrogen supply on the response of clones of birch (Betula pendula Roth.) to ozone · 1995 · compared with ambient

    Same direction

  4. negative
    In the sensitive clone, ozone reduced growth by 12–48% after 6 years of exposure, a significant difference.

    Responses of selected birch (Betula pendula Roth) clones to ozone change over time · 2003 · compared with ambient ozone (control)

    Same direction

  5. negative
    The smaller autumnal leaf dry mass decrease under elevated ozone suggests inhibited bulk leaf dry mass resorption.

    Ozone impairs autumnal resorption of nitrogen from birch (Betula pendula) leaves, causing an increase in whole-tree nitrogen loss through litter fall · 2006

    Same direction

  6. negative
    Open-soil-grown birch trees showed a 3-38% reduction in shoot growth under elevated O3.

    Physiological responses of birch (Betula pendula) to ozone: a comparison between open-soil-grown trees exposed for six growing seasons and potted seedlings exposed for one season · 2003 · compared with ambient (control)

    Same direction

  7. negative
    Ozone had a strong negative effect on the growth of birch.

    Elevated CO2 does not ameliorate effects of ozone on carbon allocation in Pinus halepensis and Betula pendula in symbiosis with Paxillus involutus · 1999

    Same direction

  8. negative
    Ozone fumigation reduced white birch seedling height growth, but the reduction was not statistically significant.

    Growth of six woody species fumigated with ozone · 1975

    Same direction

See all 9 papers →

Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.