Abstract
The accumulation and dynamic distribution of photosynthetic products in soil-plant system under elevated CO2 is an important scientific issue in the carbon cycle of ecosystems. If this issue can be clarified,it will be of great significance for evaluating of soil carbon sequestration in agricultural ecosystem under the scenario of elevated CO2. In order to investigate the formation,accumulation and dynamic distribution of photosynthetic product in soil-plant system and its relationship with the crop growth under elevated atmospheric CO2,13C-labelled CO2 was supplied continuously at two levels to spring wheat in sealed greenhouses during a grow season. The13 C enrichment dynamics in the different organs of the wheat at different stages(i. e., jointing, heading and harvest stage) were determined and the transformation of the photosynthetic C into the belowground parts was measured simultaneously. The results show that the elevated CO2 could enhance plant photosynthesis to increase the biomass of all parts of wheat,especially at the jointing stage. In addition,the elevated CO2 increased the enrichment of photosynthetic C in all parts in the wheat. At the harvest stage,the accumulation of photosynthetic C in the seeds suggested that elevated CO2 eventually increased the wheat yield by increasing the biomass and enhancing the accumulation of photosynthetic C. At both CO2 levels,the13C enrichment in the soil increased with the growth of wheat,but the content of soil organic carbon(SOC) did not change significantly in the current season,indicating the significant transformation of the photosynthetic carbon into soil constituents and thus enhancing the renewal of SOC. After a growing season of wheat,there is a total of 140mg·kg-1 13 C incorporate into the soil under the ambient CO2 supply with the photosynthetic C contribution of 97. 9%. At jointing and heading stages,there was no significant difference of13 C enrichment of the soil between the two CO2 levels.However,the value increased significantly(from-17. 9‰ to 3. 1‰) under the elevated CO2,after wheat harvest,suggesting that more photosynthetic C were transferred into the soil by the process of roots and thus the renewal of SOC was enhanced significantly with the percentage up to 52. 4%.
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Claims 10
Claim · model-written summary
Elevated CO2 increased the biomass of all parts of wheat, especially at the jointing stage.
- Taxon
- spring wheat
Triticum aestivume1 - Organ / stage
- jointing stagee0
- Treatment
- elevated CO2e0
- Outcome
- biomass of all parts of wheate0
- Direction
- increasee0
- Qualifier
- especially at the jointing stagee0
- Comparator
- ambient CO2e2
- Setting
- sealed greenhousese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the elevated CO2 could enhance plant photosynthesis to increase the biomass of all parts of wheat,especially at the jointing stage”
e1“13C-labelled CO2 was supplied continuously at two levels to spring wheat in sealed greenhouses”
e2“under the ambient CO2 supply”
Claim · model-written summary
Elevated CO2 increased the enrichment of photosynthetic C in all parts of wheat.
- Taxon
- wheatTriticum aestivume3
- Treatment
- elevated CO2e3
- Outcome
- enrichment of photosynthetic C in all partse3
- Direction
- increasede3
- Comparator
- ambient CO2e2
- Setting
- sealed greenhousese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“the elevated CO2 increased the enrichment of photosynthetic C in all parts in the wheat”
e2“under the ambient CO2 supply”
e1“13C-labelled CO2 was supplied continuously at two levels to spring wheat in sealed greenhouses”
Claim · model-written summary
Elevated CO2 eventually increased wheat yield at harvest by increasing biomass and photosynthetic C accumulation in seeds.
- Taxon
- wheatTriticum aestivume3
- Organ / stage
- harvest stagee3
- Treatment
- elevated CO2e3
- Outcome
- wheat yielde3
- Direction
- increasede3
- Qualifier
- by increasing the biomass and enhancing the accumulation of photosynthetic Ce3
- Comparator
- ambient CO2e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“At the harvest stage,the accumulation of photosynthetic C in the seeds suggested that elevated CO2 eventually increased the wheat yield by increasing the biomass and enhancing the accumulation of photosynthetic C”
e2“under the ambient CO2 supply”
Claim · model-written summary
The 13C enrichment in the soil increased with the growth of wheat at both CO2 levels.
- Taxon
- wheatTriticum aestivume4
- Outcome
- 13C enrichment in the soile4
- Direction
- increasede4
- Qualifier
- At both CO2 levelse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“At both CO2 levels,the13C enrichment in the soil increased with the growth of wheat”
Claim · model-written summary
At jointing and heading stages, 13C enrichment of the soil did not differ significantly between the two CO2 levels.
- Taxon
- spring wheatTriticum aestivume1
- Organ / stage
- jointing and heading stagese5
- Outcome
- 13 C enrichment of the soile5
- Direction
- no significant differencee5
- Qualifier
- between the two CO2 levelse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“13C-labelled CO2 was supplied continuously at two levels to spring wheat in sealed greenhouses”
e5“At jointing and heading stages,there was no significant difference of13 C enrichment of the soil between the two CO2 levels”
Claim · model-written summary
Under elevated CO2, soil 13C enrichment rose significantly at harvest, from -17.9 per mille to 3.1 per mille.
- Taxon
- wheatTriticum aestivume6
- Treatment
- elevated CO2e6
- Outcome
- 13 C enrichment of the soile5
- Direction
- increasede6
- Value
- from-17. 9‰ to 3. 1‰e6
- Qualifier
- after wheat harveste6
- Comparator
- ambient CO2e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“At jointing and heading stages,there was no significant difference of13 C enrichment of the soil between the two CO2 levels”
e6“However,the value increased significantly(from-17. 9‰ to 3. 1‰) under the elevated CO2,after wheat harvest”
e2“under the ambient CO2 supply”
Claim · model-written summary
The renewal of soil organic carbon was enhanced significantly, by up to 52.4 percent, from photosynthetic carbon.
- Taxon
- spring wheatTriticum aestivume1
- Outcome
- renewal of SOCe7
- Direction
- enhancede7
- Value
- 52. 4%e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“13C-labelled CO2 was supplied continuously at two levels to spring wheat in sealed greenhouses”
e7“thus the renewal of SOC was enhanced significantly with the percentage up to 52. 4%”
Claim · model-written summary
Soil organic carbon content did not change significantly in the current season.
- Taxon
- spring wheatTriticum aestivume1
- Outcome
- content of soil organic carbon(SOC)e3
- Direction
- did not changee3
- Qualifier
- in the current seasone3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“13C-labelled CO2 was supplied continuously at two levels to spring wheat in sealed greenhouses”
e3“the content of soil organic carbon(SOC) did not change significantly in the current season”
Claim · model-written summary
A total of 140 mg kg-1 of 13C was incorporated into the soil under ambient CO2 supply after a growing season.
- Taxon
- spring wheatTriticum aestivume1
- Outcome
- 13 C incorporate into the soile2
- Value
- 140mg·kg-1e2
- Qualifier
- under the ambient CO2 supplye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“13C-labelled CO2 was supplied continuously at two levels to spring wheat in sealed greenhouses”
e2“there is a total of 140mg·kg-1 13 C incorporate into the soil under the ambient CO2 supply”
Claim · model-written summary
The photosynthetic C contribution to soil 13C was 97.9 percent.
- Taxon
- spring wheatTriticum aestivume1
- Outcome
- photosynthetic C contributione2
- Value
- 97. 9%e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“13C-labelled CO2 was supplied continuously at two levels to spring wheat in sealed greenhouses”
e2“with the photosynthetic C contribution of 97. 9%”
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See all 203 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.