Abstract
Hybrid poplars (Populus spp.) grown in clean chambers were compared with poplars of the same nine clones grown in chambers fumigated with 15 pphm O/sub 3/, 25 pphm SO/sub 2/, or both. After 102 days, fumigated seedlings of all nine clones had lower specific gravity; those of six clones had lower dry weight/fresh weight ratios; and those of three clones had lower height, fresh weight, and dry weight. To test the effect of the chambers, seedlings of six clones grown in open-topped field chambers were compared with seedlings of the same clones grown in the open. Significant differences were found in stem fresh weight and dry weight in four clones; height in five clones; and specific gravity in one clone. There were no differences in dry weight/fresh weight ratio. The results suggest that dry weight/fresh weight ratio and specific gravity may be useful measures of the impact of air pollution on forests.
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Claims 8
Claim · model-written summary
Fumigation lowered specific gravity in all nine poplar clones.
- Treatment
- fumigated with 15 pphm O/sub 3/, 25 pphm SO/sub 2/, or bothe0
- Outcome
- specific gravitye0
- Direction
- lowere0
- Qualifier
- all nine clonese0
- Comparator
- clean chamberse0
PopulusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hybrid poplars (Populus spp.) grown in clean chambers were compared with poplars of the same nine clones grown in chambers fumigated with 15 pphm O/sub 3/, 25 pphm SO/sub 2/, or both. After 102 days, fumigated seedlings of all nine clones had lower specific gravity”
Claim · model-written summary
Fumigation lowered dry to fresh weight ratio in six clones.
- Treatment
- fumigated with 15 pphm O/sub 3/, 25 pphm SO/sub 2/, or bothe1
- Outcome
- dry weight/fresh weight ratiose0
- Direction
- lowere0
- Qualifier
- six clonese0
- Comparator
- clean chamberse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fumigated seedlings of all nine clones had lower specific gravity; those of six clones had lower dry weight/fresh weight ratios”
e1“grown in clean chambers were compared with poplars of the same nine clones grown in chambers fumigated with 15 pphm O/sub 3/, 25 pphm SO/sub 2/, or both”
t0“hybrid poplar”
Claim · model-written summary
Fumigation lowered height, fresh weight and dry weight in three clones.
- Treatment
- fumigated with 15 pphm O/sub 3/, 25 pphm SO/sub 2/, or bothe1
- Outcome
- height, fresh weight, and dry weighte0
- Direction
- lowere0
- Qualifier
- three clonese0
- Comparator
- clean chamberse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“those of three clones had lower height, fresh weight, and dry weight”
e1“grown in clean chambers were compared with poplars of the same nine clones grown in chambers fumigated with 15 pphm O/sub 3/, 25 pphm SO/sub 2/, or both”
t0“hybrid poplar”
Claim · model-written summary
Open-topped chambers differed from open growth in stem fresh and dry weight for four clones.
- Treatment
- open-topped field chamberse0
- Outcome
- stem fresh weight and dry weighte0
- Qualifier
- four clonese0
- Comparator
- grown in the opene0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedlings of six clones grown in open-topped field chambers were compared with seedlings of the same clones grown in the open. Significant differences were found in stem fresh weight and dry weight in four clones”
t0“hybrid poplar”
Claim · model-written summary
Open-topped chambers differed from open growth in height for five clones.
- Treatment
- open-topped field chamberse0
- Outcome
- heighte0
- Qualifier
- five clonese0
- Comparator
- grown in the opene0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedlings of six clones grown in open-topped field chambers were compared with seedlings of the same clones grown in the open. Significant differences were found in stem fresh weight and dry weight in four clones; height in five clones”
t0“hybrid poplar”
Claim · model-written summary
Open-topped chambers differed from open growth in specific gravity for one clone.
- Treatment
- open-topped field chamberse0
- Outcome
- specific gravitye0
- Qualifier
- one clonee0
- Comparator
- grown in the opene0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedlings of six clones grown in open-topped field chambers were compared with seedlings of the same clones grown in the open. Significant differences were found in stem fresh weight and dry weight in four clones; height in five clones; and specific gravity in one clone”
t0“hybrid poplar”
Claim · model-written summary
Open-topped chambers did not differ from open growth in dry to fresh weight ratio.
- Treatment
- open-topped field chamberse1
- Outcome
- dry weight/fresh weight ratioe0
- Direction
- no differencese0
- Comparator
- grown in the opene1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no differences in dry weight/fresh weight ratio”
e1“grown in open-topped field chambers were compared with seedlings of the same clones grown in the open”
t0“hybrid poplar”
Claim · model-written summary
The authors suggest dry to fresh weight ratio and specific gravity as measures of forest air pollution impact.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry weight/fresh weight ratio and specific gravity may be useful measures of the impact of air pollution on forests”
t0“hybrid poplar”
The same questions in other papers
solarization · growth · Populus (poplar)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 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.