Abstract
Pinus radiata D. Don (half-sib families 20010 and 20062) and Pinus caribaea var hondurensis (an open-pollinated family) were grown for 49 weeks at seven levels of phosphorus and at CO(2) concentrations of either 340 or 660 microliters per liter, to establish if the phosphorus requirements differed between the CO(2) concentrations and if mycorrhizal associations were affected. When soil phosphorus availability was low, phosphorus uptake was increased by elevated CO(2). This may have been related to changes in mycorrhizal competition. When the phosphorus concentration in the youngest fully expanded needles was above 600 milligrams per kilogram the shoot weight of all pine families was greater at high CO(2) due to increases in rates of photosynthesis. More dry weight was partitioned to the stems of P. radiata family 20010 and P. caribaea. At foliar phosphorus concentrations above 1000 milligrams per kilogram (P. radiata) and 700 milligrams per kilogram (P. caribaea), growth did not increase at 340 microliters of CO(2) per liter. Soluble sugar levels in the same needles mirrored the growth response, but the starch concentration declined with increasing phosphorus. At 660 microliters of CO(2) per liter, shoot weight and soluble sugar concentrations were still increasing up to a foliar P concentration of 1800 milligrams per kilogram for P. radiata and 1600 milligrams per kilogram for P. caribaea. The starch concentrations did not decline. These results indicate that higher foliar phosphorus concentrations are required to realize the maximum growth potential of pines at elevated CO(2).
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Claims 14
Claim · model-written summary
When soil phosphorus availability was low, phosphorus uptake was increased by elevated CO(2).
- Treatment
- elevated CO(2)e0
- Outcome
- phosphorus uptakee0
- Direction
- increasede0
- Qualifier
- soil phosphorus availability was lowe0
PinusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When soil phosphorus availability was low, phosphorus uptake was increased by elevated CO(2).”
t0“Increases in Phosphorus Requirements for CO2-Enriched Pine Species”
Claim · model-written summary
This may have been related to changes in mycorrhizal competition.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This may have been related to changes in mycorrhizal competition.”
t0“Increases in Phosphorus Requirements for CO2-Enriched Pine Species”
Claim · model-written summary
the shoot weight of all pine families was greater at high CO(2) due to increases in rates of photosynthesis.
- Treatment
- high CO(2)e0
- Outcome
- shoot weighte0
- Direction
- greatere0
- Qualifier
- increases in rates of photosynthesise0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the shoot weight of all pine families was greater at high CO(2) due to increases in rates of photosynthesis.”
Claim · model-written summary
due to increases in rates of photosynthesis.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“due to increases in rates of photosynthesis.”
t0“Increases in Phosphorus Requirements for CO2-Enriched Pine Species”
Claim · model-written summary
More dry weight was partitioned to the stems of P. radiata family 20010 and P. caribaea.
- Taxon
- P. radiata family 20010
Pinus radiatae0 - Organ / stage
- stemse0
- Outcome
- dry weight was partitioned to the stemse0
- Direction
- Moree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“More dry weight was partitioned to the stems of P. radiata family 20010 and P. caribaea.”
Claim · model-written summary
More dry weight was partitioned to the stems of P. radiata family 20010 and P. caribaea.
- Taxon
- P. caribaea
Pinus caribaeae0 - Organ / stage
- stemse0
- Outcome
- dry weight was partitioned to the stemse0
- Direction
- Moree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“More dry weight was partitioned to the stems of P. radiata family 20010 and P. caribaea.”
Claim · model-written summary
At foliar phosphorus concentrations above 1000 milligrams per kilogram (P. radiata) and 700 milligrams per kilogram (P. caribaea), growth did not increase at 340 microliters of CO(2) per liter.
- Taxon
- P. radiataPinus radiatae0
- Outcome
- growthe0
- Direction
- did not increasee0
- Value
- 1000 milligrams per kilograme0
- Qualifier
- 340 microliters of CO(2) per litere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At foliar phosphorus concentrations above 1000 milligrams per kilogram (P. radiata) and 700 milligrams per kilogram (P. caribaea), growth did not increase at 340 microliters of CO(2) per liter.”
Claim · model-written summary
At foliar phosphorus concentrations above 1000 milligrams per kilogram (P. radiata) and 700 milligrams per kilogram (P. caribaea), growth did not increase at 340 microliters of CO(2) per liter.
- Taxon
- P. caribaeaPinus caribaeae0
- Outcome
- growthe0
- Direction
- did not increasee0
- Value
- 700 milligrams per kilograme0
- Qualifier
- 340 microliters of CO(2) per litere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At foliar phosphorus concentrations above 1000 milligrams per kilogram (P. radiata) and 700 milligrams per kilogram (P. caribaea), growth did not increase at 340 microliters of CO(2) per liter.”
Claim · model-written summary
Soluble sugar levels in the same needles mirrored the growth response, but the starch concentration declined with increasing phosphorus.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soluble sugar levels in the same needles mirrored the growth response, but the starch concentration declined with increasing phosphorus.”
t0“Increases in Phosphorus Requirements for CO2-Enriched Pine Species”
Claim · model-written summary
the starch concentration declined with increasing phosphorus.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the starch concentration declined with increasing phosphorus.”
t0“Increases in Phosphorus Requirements for CO2-Enriched Pine Species”
Claim · model-written summary
At 660 microliters of CO(2) per liter, shoot weight and soluble sugar concentrations were still increasing up to a foliar P concentration of 1800 milligrams per kilogram for P. radiata and 1600 milligrams per kilogram for P. caribaea.
- Taxon
- P. radiataPinus radiatae0
- Outcome
- shoot weight and soluble sugar concentrationse0
- Direction
- increasinge0
- Value
- 1800 milligrams per kilograme0
- Qualifier
- 660 microliters of CO(2) per litere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 660 microliters of CO(2) per liter, shoot weight and soluble sugar concentrations were still increasing up to a foliar P concentration of 1800 milligrams per kilogram for P. radiata and 1600 milligrams per kilogram for P. caribaea.”
Claim · model-written summary
At 660 microliters of CO(2) per liter, shoot weight and soluble sugar concentrations were still increasing up to a foliar P concentration of 1800 milligrams per kilogram for P. radiata and 1600 milligrams per kilogram for P. caribaea.
- Taxon
- P. caribaeaPinus caribaeae0
- Outcome
- shoot weight and soluble sugar concentrationse0
- Direction
- increasinge0
- Value
- 1600 milligrams per kilograme0
- Qualifier
- 660 microliters of CO(2) per litere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 660 microliters of CO(2) per liter, shoot weight and soluble sugar concentrations were still increasing up to a foliar P concentration of 1800 milligrams per kilogram for P. radiata and 1600 milligrams per kilogram for P. caribaea.”
Claim · model-written summary
The starch concentrations did not decline.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The starch concentrations did not decline.”
t0“Increases in Phosphorus Requirements for CO2-Enriched Pine Species”
Claim · model-written summary
higher foliar phosphorus concentrations are required to realize the maximum growth potential of pines at elevated CO(2).
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher foliar phosphorus concentrations are required to realize the maximum growth potential of pines at elevated CO(2).”
The same questions in other papers
co2 · growth · PinusPositive and negative results
6 papers in the same direction as this paper · 4 in the opposite direction
- positive
- no effect
- no effect
7 papers more in this group
See all 11 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.