Abstract
Seasonal patterns of biomass accumulation and carbon allocation were determined for 1-year-old loblolly pine (Pinustaeda L.) seedlings grown in soil having either 15 or 35 μg Mg•g −1 and exposed to subambient, ambient, or twice ambient levels of ozone (O 3 ) and simulated rainfall at pH 3.8 or 5.2 in open-top chambers. Seedlings were harvested during the 1988 dormancy period, immediately prior to bud break in 1989, during the first and third foliar growth flushes of 1989, and at the end of the 1989 growing season. At each harvest, biomass of individual seedling components was determined for all seedlings, and 14 C allocation among components was determined on a subset of seedlings. Seedlings exposed to twice ambient O 3 exhibited a delay in fine-root production at the beginning of the 1989 growing season and reduced coarse-root biomass at the end of the 1989 growing season. Acidic precipitation and soil Mg treatments did not significantly affect biomass at any harvest date, nor were any treatment interactions observed. Biomass accumulation and carbon allocation were strongly affected by plant phenological stage, with maximum root allocation immediately prior to bud break and maximum shoot allocation at the end of the growing season. Seedlings exposed to twice ambient levels of O 3 exhibited increased total respirational losses, decreased foliar retention, and slightly reduced export of initial 14 C label to stem and roots compared with seedlings exposed to subambient O 3 ; however, these trends were not statistically significant.
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Claims 10
Claim · model-written summary
Twice ambient ozone delayed fine-root production early in the 1989 growing season.
- Taxon
- loblolly pine
Pinus taedae1 - Organ / stage
- fine-roote0
- Treatment
- twice ambient O 3e0
- Outcome
- fine-root productione0
- Direction
- delaye0
- Comparator
- ambiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings exposed to twice ambient O 3 exhibited a delay in fine-root production at the beginning of the 1989 growing season”
e1“loblolly pine (Pinustaeda L.)”
Claim · model-written summary
Twice ambient ozone reduced coarse-root biomass at the end of the 1989 growing season.
- Taxon
- loblolly pinePinus taedae1
- Treatment
- twice ambient O 3e0
- Outcome
- coarse-root biomasse0
- Direction
- reducede0
- Comparator
- ambiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings exposed to twice ambient O 3 exhibited a delay in fine-root production at the beginning of the 1989 growing season and reduced coarse-root biomass at the end of the 1989 growing season.”
e1“loblolly pine (Pinustaeda L.)”
Claim · model-written summary
Acidic precipitation did not significantly affect seedling biomass at any harvest.
- Taxon
- loblolly pinePinus taedae1
- Treatment
- Acidic precipitatione0
- Outcome
- biomasse0
- Direction
- did not significantly affecte0
- Comparator
- soil Mg treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acidic precipitation and soil Mg treatments did not significantly affect biomass at any harvest date”
e1“loblolly pine (Pinustaeda L.)”
Claim · model-written summary
Soil Mg treatment did not significantly affect biomass at any harvest.
- Taxon
- loblolly pinePinus taedae1
- Treatment
- soil Mg treatmentse0
- Outcome
- biomasse0
- Direction
- did not significantly affecte0
- Comparator
- Acidic precipitatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acidic precipitation and soil Mg treatments did not significantly affect biomass at any harvest date”
e1“loblolly pine (Pinustaeda L.)”
Claim · model-written summary
No treatment interactions were observed for biomass.
- Taxon
- loblolly pinePinus taedae1
- Outcome
- treatment interactionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nor were any treatment interactions observed.”
e1“loblolly pine (Pinustaeda L.)”
Claim · model-written summary
Root carbon allocation was maximal immediately before bud break.
- Taxon
- loblolly pinePinus taedae1
- Organ / stage
- bud breake0
- Outcome
- root allocatione0
- Direction
- maximume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum root allocation immediately prior to bud break”
e1“loblolly pine (Pinustaeda L.)”
Claim · model-written summary
Shoot carbon allocation was maximal at the end of the growing season.
- Taxon
- loblolly pinePinus taedae1
- Outcome
- shoot allocatione0
- Direction
- maximume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum shoot allocation at the end of the growing season”
e1“loblolly pine (Pinustaeda L.)”
Claim · model-written summary
Twice ambient ozone increased respirational losses relative to subambient ozone, without statistical significance.
- Taxon
- loblolly pinePinus taedae1
- Treatment
- twice ambient levels of O 3e0
- Outcome
- total respirational lossese0
- Direction
- increasede0
- Comparator
- subambient O 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings exposed to twice ambient levels of O 3 exhibited increased total respirational losses, decreased foliar retention, and slightly reduced export of initial 14 C label to stem and roots compared with seedlings exposed to subambient O 3 ; however, these trends were not statistically significant.”
e1“loblolly pine (Pinustaeda L.)”
Claim · model-written summary
Twice ambient ozone decreased foliar carbon retention relative to subambient ozone, without statistical significance.
- Taxon
- loblolly pinePinus taedae1
- Treatment
- twice ambient levels of O 3e0
- Outcome
- foliar retentione0
- Direction
- decreasede0
- Comparator
- subambient O 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings exposed to twice ambient levels of O 3 exhibited increased total respirational losses, decreased foliar retention, and slightly reduced export of initial 14 C label to stem and roots compared with seedlings exposed to subambient O 3 ; however, these trends were not statistically significant.”
e1“loblolly pine (Pinustaeda L.)”
Claim · model-written summary
Twice ambient ozone slightly reduced initial 14C export to stem and roots relative to subambient ozone, without statistical significance.
- Taxon
- loblolly pinePinus taedae1
- Treatment
- twice ambient levels of O 3e0
- Outcome
- export of initial 14 C label to stem and rootse0
- Direction
- slightly reducede0
- Comparator
- subambient O 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings exposed to twice ambient levels of O 3 exhibited increased total respirational losses, decreased foliar retention, and slightly reduced export of initial 14 C label to stem and roots compared with seedlings exposed to subambient O 3 ; however, these trends were not statistically significant.”
e1“loblolly pine (Pinustaeda L.)”
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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.