Abstract
Three grasses (Poa pratensis, Hordeum jubatum, and Puccinellia nuttalliana) were grown in monoculture and three-species mixture at each of eight salinity levels in a controlled environment chamber. In monoculture, all species grew best when no salts were added to the nutrient medium. When salts were added the species showed differing degrees of salt tolerance. Percent decreases in total biomass with increasing salinity and shifts in aboveground to belowground biomass ratios suggested increased salt tolerance in the order P. pratensis < H. jubatum < P. nuttalliana. In mixture, all species showed a significant change in salinity response when compared with their responses in monoculture. Interspecific competition resulted in P. pratensis being suppressed at all but the lowest salinities. Hordeum jubatum showed the least suppression at intermediate salinities, while P. nuttalliana was least suppressed at the highest salinities. These results indicate that interspecific competition results in a shift in the peak performance of more salt-tolerant species toward the high end of the salinity gradient. The species distributions in our experimental mixtures reflected those observed in the field, suggesting that competition plays an important role in structuring inland saline plant communities. Key words: halophyte, glycophyte, community, Hordeum jubatum, Puccinellia nuttalliana, Poa pratensis.
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Claims 10
Claim · model-written summary
All three grass species grew best in monoculture when no salts were added to the nutrient medium.
- Taxon
- Poa pratensis, Hordeum jubatum, and Puccinellia nuttalliana
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Hordeum jubatum.jpg?width=60)
Poa pratensis
Puccinellia nuttallianae0 - Treatment
- saltse1
- Outcome
- grew beste1
- Direction
- beste1
- Comparator
- no saltse1
- Setting
- monoculturee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
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Verbatim
e0“Three grasses (Poa pratensis, Hordeum jubatum, and Puccinellia nuttalliana) were grown in monoculture and three-species mixture”
e1“In monoculture, all species grew best when no salts were added to the nutrient medium”
Claim · model-written summary
Increasing salinity decreased total biomass of the grasses in monoculture.
- Taxon
- Poa pratensis, Hordeum jubatum, and Puccinellia nuttallianaHordeum jubatumPoa pratensisPuccinellia nuttallianae0
- Treatment
- increasing salinitye2
- Outcome
- total biomasse2
- Direction
- decreasese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Three grasses (Poa pratensis, Hordeum jubatum, and Puccinellia nuttalliana) were grown in monoculture and three-species mixture”
e2“Percent decreases in total biomass with increasing salinity”
Claim · model-written summary
Salt tolerance increased in the order P. pratensis, H. jubatum, P. nuttalliana.
- Taxon
- P. pratensisPoa pratensise3
- Outcome
- salt tolerancee3
- Direction
- increasede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“suggested increased salt tolerance in the order P. pratensis < H. jubatum < P. nuttalliana”
Claim · model-written summary
In mixture all species showed a significant change in salinity response compared with monoculture.
- Taxon
- Poa pratensis, Hordeum jubatum, and Puccinellia nuttallianaHordeum jubatumPoa pratensisPuccinellia nuttallianae0
- Treatment
- mixturee4
- Outcome
- salinity responsee4
- Direction
- changee4
- Comparator
- monoculturee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Three grasses (Poa pratensis, Hordeum jubatum, and Puccinellia nuttalliana) were grown in monoculture and three-species mixture”
e4“In mixture, all species showed a significant change in salinity response when compared with their responses in monoculture”
Claim · model-written summary
Interspecific competition suppressed P. pratensis at all but the lowest salinities.
- Taxon
- P. pratensisPoa pratensise5
- Treatment
- Interspecific competitione5
- Outcome
- suppressede5
- Direction
- suppressede5
- Qualifier
- all but the lowest salinitiese5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Interspecific competition resulted in P. pratensis being suppressed at all but the lowest salinities”
Claim · model-written summary
H. jubatum showed the least suppression at intermediate salinities.
- Taxon
- Hordeum jubatumHordeum jubatume6
- Outcome
- least suppressione6
- Direction
- least suppressione6
- Qualifier
- at intermediate salinitiese6
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Hordeum jubatum showed the least suppression at intermediate salinities”
Claim · model-written summary
P. nuttalliana was least suppressed at the highest salinities.
- Taxon
- P. nuttallianaPuccinellia nuttallianae7
- Outcome
- least suppressede7
- Direction
- least suppressede7
- Qualifier
- at the highest salinitiese7
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“P. nuttalliana was least suppressed at the highest salinities”
Claim · model-written summary
Interspecific competition shifted the peak performance of more salt-tolerant species toward the high end of the salinity gradient.
Verbatim
e1“interspecific competition results in a shift in the peak performance of more salt-tolerant species toward the high end of the salinity gradient”
Claim · model-written summary
Species distributions in the experimental mixtures reflected those observed in the field.
- Taxon
- Poa pratensis, Hordeum jubatum, and Puccinellia nuttallianaHordeum jubatumPoa pratensisPuccinellia nuttallianae0
- Outcome
- species distributionse1
- Setting
- fielde1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Three grasses (Poa pratensis, Hordeum jubatum, and Puccinellia nuttalliana) were grown in monoculture and three-species mixture”
e1“The species distributions in our experimental mixtures reflected those observed in the field”
Claim · model-written summary
Competition plays an important role in structuring inland saline plant communities.
- Taxon
- Poa pratensis, Hordeum jubatum, and Puccinellia nuttallianaHordeum jubatumPoa pratensisPuccinellia nuttallianae0
- Outcome
- structuring inland saline plant communitiese1
- Qualifier
- competition plays an important rolee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Three grasses (Poa pratensis, Hordeum jubatum, and Puccinellia nuttalliana) were grown in monoculture and three-species mixture”
e1“competition plays an important role in structuring inland saline plant communities”
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salinity · growth · Hordeum jubatum (foxtail barley)Positive and negative results
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7 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
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6 papers more in this group
See all 10 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.