Abstract
Climate change is a major factor shaping the distribution of plant species. A well-documented response consequence is the upward shift of plant species to higher elevations as they track their thermal niches. However, plants migrating upward face complex environmental changes shaped by multiple interacting factors. Among these, reduced air pressure remains relatively understudied, its effects are often confounded with other covarying parameters. This study investigated the direct impact of reduced air pressure on the eco-physiological responses of two plant species (Hieracium pilosella L. and Trifolium pratensis L.). The plants were grown for 4 weeks in controlled climatic chambers under different air pressures (85, 75, and 62 kPa), while all other environmental parameters were kept constant. At the end of the experiment, photosynthesis, chlorophyll fluorescence, growth, carbohydrate content, carbon stable isotopes, and plant nitrogen concentrations were determined. Reduced air pressure decreased growth, carbon isotopic discrimination and chlorophyll content, but increased CO2 fixation efficiency and carbohydrate accumulation in the leaves. These results suggest that reduced air pressure impacts plant performance during upslope migration and may, in turn, contribute to shaping future distribution patterns in alpine ecosystems.
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Claims 10
Claim · model-written summary
Reduced air pressure decreased growth in Hieracium pilosella L.
- Taxon
- Hieracium pilosella L.
_-_geograph.org.uk_-_1369110.jpg?width=60)
Pilosella officinarume0 - Treatment
- Reduced air pressuree1
- Outcome
- growthe1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_-_geograph.org.uk_-_1369110.jpg?width=500)
Verbatim
e0“Hieracium pilosella L. and Trifolium pratensis L.”
e1“Reduced air pressure decreased growth, carbon isotopic discrimination and chlorophyll content”
Claim · model-written summary
Reduced air pressure decreased carbon isotopic discrimination in Hieracium pilosella L.
- Taxon
- Hieracium pilosella L.Pilosella officinarume0
- Treatment
- Reduced air pressuree1
- Outcome
- carbon isotopic discriminatione1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hieracium pilosella L. and Trifolium pratensis L.”
e1“Reduced air pressure decreased growth, carbon isotopic discrimination and chlorophyll content”
Claim · model-written summary
Reduced air pressure decreased chlorophyll content in Hieracium pilosella L.
- Taxon
- Hieracium pilosella L.Pilosella officinarume0
- Treatment
- Reduced air pressuree1
- Outcome
- chlorophyll contente1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hieracium pilosella L. and Trifolium pratensis L.”
e1“Reduced air pressure decreased growth, carbon isotopic discrimination and chlorophyll content”
Claim · model-written summary
Reduced air pressure increased CO2 fixation efficiency in Hieracium pilosella L.
- Taxon
- Hieracium pilosella L.Pilosella officinarume0
- Treatment
- Reduced air pressuree1
- Outcome
- CO2 fixation efficiencye1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hieracium pilosella L. and Trifolium pratensis L.”
e1“Reduced air pressure decreased growth, carbon isotopic discrimination and chlorophyll content, but increased CO2 fixation efficiency and carbohydrate accumulation in the leaves.”
Claim · model-written summary
Reduced air pressure increased carbohydrate accumulation in the leaves of Hieracium pilosella L.
- Taxon
- Hieracium pilosella L.Pilosella officinarume0
- Organ / stage
- leavese1
- Outcome
- carbohydrate accumulatione1
- Direction
- increasede1
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hieracium pilosella L. and Trifolium pratensis L.”
e1“increased CO2 fixation efficiency and carbohydrate accumulation in the leaves”
Claim · model-written summary
Reduced air pressure decreased growth in Trifolium pratensis L.
Not reportedComparator
Verbatim
e0“Hieracium pilosella L. and Trifolium pratensis L.”
e1“Reduced air pressure decreased growth, carbon isotopic discrimination and chlorophyll content”
Claim · model-written summary
Reduced air pressure decreased carbon isotopic discrimination in Trifolium pratensis L.
- Taxon
- Trifolium pratensis L.e0
- Treatment
- Reduced air pressuree1
- Outcome
- carbon isotopic discriminatione1
- Direction
- decreasede1
Not reportedComparator
Verbatim
e0“Hieracium pilosella L. and Trifolium pratensis L.”
e1“Reduced air pressure decreased growth, carbon isotopic discrimination and chlorophyll content”
Claim · model-written summary
Reduced air pressure decreased chlorophyll content in Trifolium pratensis L.
- Taxon
- Trifolium pratensis L.e0
- Treatment
- Reduced air pressuree1
- Outcome
- chlorophyll contente1
- Direction
- decreasede1
Not reportedComparator
Verbatim
e0“Hieracium pilosella L. and Trifolium pratensis L.”
e1“Reduced air pressure decreased growth, carbon isotopic discrimination and chlorophyll content”
Claim · model-written summary
Reduced air pressure increased CO2 fixation efficiency in Trifolium pratensis L.
- Taxon
- Trifolium pratensis L.e0
- Treatment
- Reduced air pressuree1
- Outcome
- CO2 fixation efficiencye1
- Direction
- increasede1
Not reportedComparator
Verbatim
e0“Hieracium pilosella L. and Trifolium pratensis L.”
e1“Reduced air pressure decreased growth, carbon isotopic discrimination and chlorophyll content, but increased CO2 fixation efficiency and carbohydrate accumulation in the leaves.”
Claim · model-written summary
Reduced air pressure increased carbohydrate accumulation in leaves of Trifolium pratensis L.
- Taxon
- Trifolium pratensis L.e0
- Organ / stage
- leavese1
- Treatment
- Reduced air pressuree1
- Outcome
- carbohydrate accumulatione1
- Direction
- increasede1
Not reportedComparator
Verbatim
e0“Hieracium pilosella L. and Trifolium pratensis L.”
e1“Reduced air pressure decreased growth, carbon isotopic discrimination and chlorophyll content, but increased CO2 fixation efficiency and carbohydrate accumulation in the leaves.”