Abstract
Changes in sward growth above ground by shade is a controversial subject for field experimentation because the differential allocation of carbon (C) to shoots and roots is difficult to measure. In this experiment the effect of three levels of irradiance (100%, 56% and 33% of full sunlight) on C and nitrogen (N) allocation in Dichanthium aristatum were studied under well-watered and well-fertilized conditions. Dry matter accumulation, weight ratio per organ and N allocation indices were studied during two cycles of growth, after planting and after cutting. Shade had no effect on the C and N influxes into the whole plant, showing that the N absorption is regulated by the C assimilation. However, C, and principally N, were preferentially allocated to the laminae under reduced irradiance. Under 100% and 56% of full sunlight, more N was allocated to the stubble component. This situation was reversed in the lowest radiation level, indicating that N reserves, and not exclusively C reserves, may limit the regrowth of this perennial grass when growing under high levels of shade. The higher shoot:root ratio under shade shows the disadvantage in the use of radiation use efficiency calculated from aerial biomass data when comparing differents levels of shade.
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Claims 7
Claim · model-written summary
Shade (100%, 56% and 33% of full sunlight) had no effect on whole-plant C and N influx in Dichanthium aristatum.
- Taxon
- Dichanthium aristatum
Dichanthium aristatume1 - Treatment
- three levels of irradiance (100%, 56% and 33% of full sunlight)e1
- Outcome
- C and N influxes into the whole plante2
- Direction
- no effecte2
- Comparator
- full sunlighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the effect of three levels of irradiance (100%, 56% and 33% of full sunlight) on C and nitrogen (N) allocation in Dichanthium aristatum”
e2“Shade had no effect on the C and N influxes into the whole plant”
Claim · model-written summary
C and, principally, N were preferentially allocated to the laminae under reduced irradiance relative to full sunlight.
- Taxon
- Dichanthium aristatumDichanthium aristatume1
- Organ / stage
- laminaee3
- Treatment
- reduced irradiancee3
- Outcome
- allocated to the laminaee3
- Direction
- preferentiallye3
- Comparator
- full sunlighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the effect of three levels of irradiance (100%, 56% and 33% of full sunlight) on C and nitrogen (N) allocation in Dichanthium aristatum”
e3“C, and principally N, were preferentially allocated to the laminae under reduced irradiance”
Claim · model-written summary
Under 100% and 56% of full sunlight more N was allocated to the stubble component than under the lowest radiation level (33%).
- Taxon
- Dichanthium aristatumDichanthium aristatume1
- Organ / stage
- stubble componente4
- Treatment
- 100% and 56% of full sunlighte4
- Outcome
- allocated to the stubble componente4
- Direction
- moree4
- Comparator
- lowest radiation levele5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the effect of three levels of irradiance (100%, 56% and 33% of full sunlight) on C and nitrogen (N) allocation in Dichanthium aristatum”
e4“Under 100% and 56% of full sunlight, more N was allocated to the stubble component”
e5“This situation was reversed in the lowest radiation level”
Claim · model-written summary
N reserves, and not exclusively C reserves, may limit regrowth of this perennial grass under high levels of shade.
- Taxon
- Dichanthium aristatumDichanthium aristatume1
- Treatment
- high levels of shadee6
- Outcome
- regrowthe6
- Qualifier
- N reserves, and not exclusively C reserves, may limite6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the effect of three levels of irradiance (100%, 56% and 33% of full sunlight) on C and nitrogen (N) allocation in Dichanthium aristatum”
e6“N reserves, and not exclusively C reserves, may limit the regrowth of this perennial grass when growing under high levels of shade”
Claim · model-written summary
N absorption is regulated by C assimilation in this grass.
- Taxon
- Dichanthium aristatumDichanthium aristatume1
- Outcome
- N absorptione7
- Qualifier
- regulated by the C assimilatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the effect of three levels of irradiance (100%, 56% and 33% of full sunlight) on C and nitrogen (N) allocation in Dichanthium aristatum”
e7“showing that the N absorption is regulated by the C assimilation”
Claim · model-written summary
The shoot:root ratio was higher under shade in Dichanthium aristatum.
- Taxon
- Dichanthium aristatumDichanthium aristatume1
- Treatment
- under shadee0
- Outcome
- shoot:root ratioe0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the effect of three levels of irradiance (100%, 56% and 33% of full sunlight) on C and nitrogen (N) allocation in Dichanthium aristatum”
e0“The higher shoot:root ratio under shade shows the disadvantage in the use of radiation use efficiency calculated from aerial biomass data when comparing differents levels of shade”
Claim · model-written summary
Radiation use efficiency calculated from aerial biomass data is disadvantaged when comparing different levels of shade.
- Taxon
- Dichanthium aristatumDichanthium aristatume1
- Outcome
- disadvantage in the use of radiation use efficiency calculated from aerial biomass datae0
- Comparator
- differents levels of shadee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the effect of three levels of irradiance (100%, 56% and 33% of full sunlight) on C and nitrogen (N) allocation in Dichanthium aristatum”
e0“The higher shoot:root ratio under shade shows the disadvantage in the use of radiation use efficiency calculated from aerial biomass data when comparing differents levels of shade”