Abstract
With this study, we aimed to determine how elevated CO(2) affects rhizodeposition and the cycling of rhizodeposited nitrogen (N) in the soil under C(3) and C(4) plants. In addition, we examined how cultivated genotypes of wheat (Triticum turgidum) and maize (Zea mays) responded to elevated CO(2) in comparison with their wild relatives. By constructing an N-transfer experiment we could directly assess cycling of the rhizodeposited N and trace the fate of rhizodeposited N in the soil and in receiver plants. Biomass production, rhizodeposition and cycling of root-borne N in maize genotypes were not affected by elevated CO(2). Elevated CO(2) stimulated above- and below-ground biomass production of the wheat genotypes on average by 38%, and increased rhizodeposition and immobilization of root-derived N on average by 30%. Concurrently, elevated CO(2) reduced mineral (15)N and re-uptake of the root-derived N by 50% in wheat. This study shows that elevated CO(2) may enhance N limitation by increasing N rhizodeposition and subsequent immobilization of the root-derived N.
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Claims 5
Claim · model-written summary
Elevated CO2 did not affect maize biomass, rhizodeposition or root nitrogen cycling.
- Treatment
- elevated CO(2)e0
- Outcome
- Biomass production, rhizodeposition and cycling of root-borne Ne0
- Direction
- not affectede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Biomass production, rhizodeposition and cycling of root-borne N in maize genotypes were not affected by elevated CO(2)”
Claim · model-written summary
Elevated CO2 increased wheat above and below ground biomass by an average 38%.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- Elevated CO(2)e0
- Outcome
- above- and below-ground biomass productione0
- Direction
- stimulatede0
- Value
- 38%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO(2) stimulated above- and below-ground biomass production of the wheat genotypes on average by 38%”
Claim · model-written summary
Elevated CO2 increased wheat rhizodeposition and immobilization of root derived nitrogen by an average 30%.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Elevated CO(2)e1
- Outcome
- rhizodeposition and immobilization of root-derived Ne0
- Direction
- increasede0
- Value
- 30%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased rhizodeposition and immobilization of root-derived N on average by 30%”
e1“Elevated CO(2) stimulated above- and below-ground biomass production of the wheat genotypes”
Claim · model-written summary
Elevated CO2 reduced mineral 15N and wheat reuptake of root derived nitrogen by 50%.
- Taxon
- wheatTriticum aestivume0
- Treatment
- elevated CO(2)e0
- Outcome
- mineral (15)N and re-uptake of the root-derived Ne0
- Direction
- reducede0
- Value
- 50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO(2) reduced mineral (15)N and re-uptake of the root-derived N by 50% in wheat”
Claim · model-written summary
The authors infer elevated CO2 may enhance nitrogen limitation through rhizodeposition and immobilization.
- Taxon
- wheatTriticum aestivume1
- Treatment
- elevated CO(2)e0
- Outcome
- N limitatione0
- Direction
- enhancee0
- Qualifier
- increasing N rhizodeposition and subsequent immobilization of the root-derived Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO(2) may enhance N limitation by increasing N rhizodeposition and subsequent immobilization of the root-derived N”
e1“wheat genotypes”
The same questions in other papers
co2 · yield · Zea mays (maize)Results differ
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- positive
- positive
- positive
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See all 52 papers →co2 · yield · Triticum aestivum (wheat)Positive and negative results
173 papers in the same direction as this paper · 29 in the opposite direction
- no effect
- no effect
- no effect
199 papers more in this group
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.