Abstract
An open‐top chamber experiment was carried out to examine the likely effects of elevated atmospheric [CO 2 ] on architectural as well as on physiological characteristics of two poplar clones ( Populus trichocarpa × P. deltoides clone Beaupré and P. deltoides × P. nigra clone Robusta). Crown architectural parameters required as input parameters for a three‐dimensional (3D) model of poplar structure, such as branching frequency and position, branch angle, internode length and its distribution pattern, leaf size and orientation, were measured following growth in ambient and elevated [CO 2 ] (ambient + 350 μmol mol –1 ) treated open‐top chambers. Based on this information, the light interception and photosynthesis of poplar canopies in different [CO 2 ] treatments were simulated using the 3D poplar tree model and a 3D radiative transfer model at various stages of the growing season. The first year experiments and modelling results showed that the [CO 2 ] enrichment had effects on light intercepting canopy structure as well as on leaf photosynthesis properties. The elevated [CO 2 ] treatment resulted in an increase of leaf area, canopy photosynthetic rate and above‐ground biomass production of the two poplar clones studied. However, the structural components responded less than the process components to the [CO 2 ] enrichment. Among the structural components, the increase of LAI contributed the most to the canopy light interception and canopy photosynthesis; the change of other structural aspects as a whole caused by the [CO 2 ] enrichment had little effect on daily canopy light interception and photosynthesis.
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Claims 6
Claim · model-written summary
Elevated CO2 increased leaf area in both poplar clones.
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The elevated [CO 2 ] treatment resulted in an increase of leaf area, canopy photosynthetic rate and above‐ground biomass production of the two poplar clones studied”
Claim · model-written summary
Elevated CO2 increased canopy photosynthetic rate in both poplar clones.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The elevated [CO 2 ] treatment resulted in an increase of leaf area, canopy photosynthetic rate and above‐ground biomass production of the two poplar clones studied”
Claim · model-written summary
Elevated CO2 increased aboveground biomass production in both poplar clones.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The elevated [CO 2 ] treatment resulted in an increase of leaf area, canopy photosynthetic rate and above‐ground biomass production of the two poplar clones studied”
Claim · model-written summary
Structural components responded less than process components to CO2 enrichment.
- Treatment
- [CO 2 ] enrichmente0
- Outcome
- structural componentse0
- Direction
- lesse0
- Comparator
- process componentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the structural components responded less than the process components to the [CO 2 ] enrichment”
t0“poplar”
Claim · model-written summary
Increased LAI contributed most to simulated canopy light interception and photosynthesis.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase of LAI contributed the most to the canopy light interception and canopy photosynthesis”
t0“poplar”
Claim · model-written summary
Other CO2-induced structural changes had little effect on daily canopy light interception and photosynthesis.
- Treatment
- [CO 2 ] enrichmente0
- Outcome
- daily canopy light interception and photosynthesise0
- Qualifier
- little effecte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the change of other structural aspects as a whole caused by the [CO 2 ] enrichment had little effect on daily canopy light interception and photosynthesis”
t0“poplar”
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