Abstract
Acidic rain and ozone (O 3 ) may have serious consequences on the growth and development of loblolly pine (Pinustaeda L.), a tree species of major economic importance in the southeastern United States. In two independent studies, seedlings of open-pollinated families of loblolly pine were exposed to five concentrations of O 3 (0, 80, 160, 240, or 320 nL•L −1 ) and three simulated rain acidities (pH 5.3, 4.3, or 3.3). Following 23 weeks of growth (12 weeks in charcoal-filtered air and 11 weeks of O 3 and simulated acidic rain exposures), stem height, secondary needle dry weight, top and total seedling dry weight, and root/shoot dry weight ratio all were related negatively and linearly with O 3 concentration. Stem diameter and root dry weight were also suppressed by O 3 . Suppression of the growth parameters ranged from 14 to 35% for the greatest O 3 concentration. Acidity of simulated rain did not affect seedlings, nor did it affect seedling responses to O 3 . Results indicate that acid rain probably has little effect on growth of loblolly pine seedlings, but O 3 can suppress growth to varying degrees depending on family.
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Claims 6
Claim · model-written summary
Stem height and secondary needle dry weight of loblolly pine seedlings were negatively and linearly related to O3 concentration.
- Taxon
- loblolly pine
Pinus taedat0 - Treatment
- O 3 concentratione0
- Outcome
- stem height, secondary needle dry weighte0
- Direction
- negativelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“loblolly pine”
e0“stem height, secondary needle dry weight, top and total seedling dry weight, and root/shoot dry weight ratio all were related negatively and linearly with O 3 concentration”
Claim · model-written summary
Top and total seedling dry weight and root/shoot dry weight ratio of loblolly pine were negatively and linearly related to O3 concentration.
- Taxon
- loblolly pinePinus taedat0
- Treatment
- O 3 concentratione0
- Outcome
- top and total seedling dry weight, and root/shoot dry weight ratioe0
- Direction
- negativelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“loblolly pine”
e0“stem height, secondary needle dry weight, top and total seedling dry weight, and root/shoot dry weight ratio all were related negatively and linearly with O 3 concentration”
Claim · model-written summary
Stem diameter and root dry weight of loblolly pine seedlings were also suppressed by O3.
- Taxon
- loblolly pinePinus taedat0
- Treatment
- O 3e0
- Outcome
- Stem diameter and root dry weighte0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“loblolly pine”
e0“Stem diameter and root dry weight were also suppressed by O 3”
Claim · model-written summary
Growth parameters of loblolly pine were suppressed by 14 to 35% at the greatest O3 concentration.
- Taxon
- loblolly pinePinus taedat0
- Treatment
- greatest O 3 concentratione0
- Outcome
- growth parameterse0
- Direction
- Suppressione0
- Value
- 14 to 35%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“loblolly pine”
e0“Suppression of the growth parameters ranged from 14 to 35% for the greatest O 3 concentration”
Claim · model-written summary
Acidity of simulated rain did not affect loblolly pine seedlings, nor their responses to O3.
- Taxon
- loblolly pinePinus taedat0
- Treatment
- Acidity of simulated raine0
- Outcome
- seedlingse0
- Direction
- did not affecte0
- Qualifier
- nor did it affect seedling responses to O 3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“loblolly pine”
e0“Acidity of simulated rain did not affect seedlings, nor did it affect seedling responses to O 3”
Claim · model-written summary
The authors conclude that O3 can suppress loblolly pine seedling growth to varying degrees depending on family.
- Taxon
- loblolly pinePinus taedat0
- Treatment
- O 3e0
- Outcome
- growthe0
- Direction
- suppresse0
- Qualifier
- depending on familye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“loblolly pine”
e0“O 3 can suppress growth to varying degrees depending on family”
The same questions in other papers
ozone · growth · Pinus taeda (loblolly pine)Results differ
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See all 8 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.