Abstract
Wood density influences both the physiological function and economic value of tree stems. We examined the relationship between phosphorus (P) supply and stem wood density of Eucalyptus grandis Hill ex Maiden seedlings grown with varying soil P additions and determined how changes in wood anatomy and biomass partitioning affect the relationship. Plant height, stem diameter and total biomass increased by 400-500% with increasing P supply. Stem wood density decreased sharply from 520 to 380 kg m(-3) as P supply increased to 70 mg P kg(soil) (-1). Further increases in P supply to 1000 mg P kg(soil) (-1) had no effect on wood density. The increase in wood density at low soil P supply arose principally from enhanced secondary wall thickening of stem fiber cells. Cell wall thickness increased from 3.6 to 4.5 microm as soil P supply decreased. Because fiber cell diameter was independent of soil P (12 microm +/- 0.3), the proportion of the stem occupied by cell wall material increased as P supply declined. The enhanced secondary wall thickening of stem fiber cells at low P supply was not associated with changes in whole-plant biomass partitioning. Instead, low P supply appeared to alter biomass partitioning within the stem in favor of secondary wall thickening. Thus, increased wood density in E. grandis seedlings grown at low P soil supply was associated with inhibited stem cambial activity, resulting in an increased proportion of photoassimilates available for secondary wall thickening of fiber cells.
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Claims 10
Claim · model-written summary
Increasing phosphorus supply increased plant height, stem diameter and total biomass by 400–500%.
- Taxon
- Eucalyptus grandis
Eucalyptus grandist0 - Treatment
- increasing P supplye0
- Outcome
- Plant height, stem diameter and total biomasse0
- Direction
- increasede0
- Value
- 400-500%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant height, stem diameter and total biomass increased by 400-500% with increasing P supply.”
t0“Eucalyptus grandis”
Claim · model-written summary
Stem wood density fell from 520 to 380 kg m(-3) as phosphorus supply rose to 70 mg P kg(soil) (-1).
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Treatment
- P supply increased to 70 mg P kg(soil) (-1)e0
- Outcome
- Stem wood densitye0
- Direction
- decreasede0
- Value
- from 520 to 380 kg m(-3)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stem wood density decreased sharply from 520 to 380 kg m(-3) as P supply increased to 70 mg P kg(soil) (-1).”
t0“Eucalyptus grandis”
Claim · model-written summary
Further phosphorus supply increases to 1000 mg P kg(soil) (-1) did not change wood density.
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Treatment
- P supply to 1000 mg P kg(soil) (-1)e0
- Outcome
- wood densitye0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Further increases in P supply to 1000 mg P kg(soil) (-1) had no effect on wood density.”
t0“Eucalyptus grandis”
Claim · model-written summary
At low soil phosphorus supply, enhanced secondary wall thickening of stem fiber cells principally accounted for higher wood density.
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Organ / stage
- stem fiber cellse0
- Outcome
- increase in wood densitye0
- Qualifier
- enhanced secondary wall thickeninge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in wood density at low soil P supply arose principally from enhanced secondary wall thickening of stem fiber cells.”
t0“Eucalyptus grandis”
Claim · model-written summary
Stem fiber cell wall thickness increased from 3.6 to 4.5 microm as soil phosphorus supply decreased.
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Treatment
- soil P supply decreasede0
- Outcome
- Cell wall thicknesse0
- Direction
- increasede0
- Value
- from 3.6 to 4.5 microme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cell wall thickness increased from 3.6 to 4.5 microm as soil P supply decreased.”
t0“Eucalyptus grandis”
Claim · model-written summary
Fiber cell diameter remained independent of soil phosphorus.
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Treatment
- soil Pe0
- Outcome
- fiber cell diametere0
- Direction
- independente0
- Value
- 12 microm +/- 0.3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fiber cell diameter was independent of soil P (12 microm +/- 0.3)”
t0“Eucalyptus grandis”
Claim · model-written summary
The proportion of stem occupied by cell wall material increased as phosphorus supply declined.
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Treatment
- P supply declinede0
- Outcome
- proportion of the stem occupied by cell wall materiale0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the proportion of the stem occupied by cell wall material increased as P supply declined.”
t0“Eucalyptus grandis”
Claim · model-written summary
Enhanced secondary wall thickening at low phosphorus supply was not associated with whole-plant biomass partitioning changes.
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Treatment
- low P supplye0
- Outcome
- secondary wall thickening of stem fiber cellse0
- Direction
- not associatede0
- Qualifier
- changes in whole-plant biomass partitioninge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The enhanced secondary wall thickening of stem fiber cells at low P supply was not associated with changes in whole-plant biomass partitioning.”
t0“Eucalyptus grandis”
Claim · model-written summary
Low phosphorus supply appeared to shift within-stem biomass partitioning toward secondary wall thickening.
- Taxon
- Eucalyptus grandisEucalyptus grandist0
- Treatment
- low P supplye0
- Outcome
- biomass partitioning within the steme0
- Qualifier
- in favor of secondary wall thickeninge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low P supply appeared to alter biomass partitioning within the stem in favor of secondary wall thickening.”
t0“Eucalyptus grandis”
Claim · model-written summary
At low soil phosphorus, increased wood density was associated with inhibited stem cambial activity and greater photoassimilate availability for fiber cell wall thickening.
- Taxon
- E. grandisEucalyptus grandise0
- Treatment
- low P soil supplye0
- Outcome
- increased wood densitye0
- Qualifier
- inhibited stem cambial activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased wood density in E. grandis seedlings grown at low P soil supply was associated with inhibited stem cambial activity, resulting in an increased proportion of photoassimilates available for secondary wall thickening of fiber cells.”
t0“Eucalyptus grandis”
The same questions in other papers
phosphorus · growth · Eucalyptus grandis (rose gum)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.