Abstract
When simulating canopies planted in varied densities, researchers were able to demonstrate that increase of dry matter production by enhancing CO2 quickly becomes independant of increase of leaf area, especially above leaf area index of 2; dry matter gain results mainly from photosynthesis stimulation per unit of surface (primary CO2 effect). When crop density is low (the plants remaining alone a longer time), the effects of increasing leaf surface (tillering, leaf elongation here, branching for other plants etc.) was noticeable and dry matter simulation factor reached 1.65. This area effect decreased when canopy was closed in, as the effect of different surfaces no longer worked. The stimulation of photosynthesis reached to the primary CO2 effect. The accumulation in dry matter which was fast during that phase made the original weight advantage more and more neglectible. Comparison with short term measurements showed that first order long term effect of CO2 in wheat is predictible with short term experiment, from the effect of CO2 on photosynthesis measured on reference sample.
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Claims 7
Claim · model-written summary
In simulated wheat canopies, dry matter production under enhanced CO2 became independent of leaf area increase, especially above a leaf area index of 2.
- Taxon
- Wheat
Triticum aestivumt0 - Treatment
- enhancing CO2e1
- Outcome
- dry matter productione1
- Qualifier
- especially above leaf area index of 2e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat response to CO2 enrichment”
e1“increase of dry matter production by enhancing CO2 quickly becomes independant of increase of leaf area, especially above leaf area index of 2”
Claim · model-written summary
Dry matter gain under CO2 enrichment results mainly from photosynthesis stimulation per unit of leaf surface.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- dry matter gaine0
- Qualifier
- photosynthesis stimulation per unit of surfacee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat response to CO2 enrichment”
e0“dry matter gain results mainly from photosynthesis stimulation per unit of surface (primary CO2 effect)”
Claim · model-written summary
At low crop density, the effect of increasing leaf surface raised the dry matter simulation factor to 1.65.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- When crop density is lowe2
- Outcome
- dry matter simulation factore2
- Direction
- increaseinferrede2
- Value
- 1.65e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat response to CO2 enrichment”
e2“When crop density is low (the plants remaining alone a longer time), the effects of increasing leaf surface (tillering, leaf elongation here, branching for other plants etc.) was noticeable and dry matter simulation factor reached 1.65”
Claim · model-written summary
The area effect decreased when the canopy was closed.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- canopy was closed ine3
- Outcome
- area effecte3
- Direction
- decreasede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat response to CO2 enrichment”
e3“This area effect decreased when canopy was closed in”
Claim · model-written summary
The CO2 stimulation of photosynthesis reached the primary CO2 effect in simulated canopies.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- CO2e4
- Outcome
- stimulation of photosynthesise4
- Direction
- increaseinferrede4
- Qualifier
- primary CO2 effecte4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat response to CO2 enrichment”
e4“The stimulation of photosynthesis reached to the primary CO2 effect”
Claim · model-written summary
Fast dry matter accumulation made the original weight advantage negligible in simulated canopies.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- accumulation in dry mattere6
- Outcome
- original weight advantagee6
- Direction
- decreaseinferrede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat response to CO2 enrichment”
e6“The accumulation in dry matter which was fast during that phase made the original weight advantage more and more neglectible”
Claim · model-written summary
Short-term CO2 experiments predict the first-order long-term CO2 effect on wheat.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- first order long term effect of CO2e5
- Comparator
- short term measurementse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat response to CO2 enrichment”
e5“Comparison with short term measurements showed that first order long term effect of CO2 in wheat is predictible with short term experiment”