Abstract
The relationship between net photosynthetic (P N) and leaf respiration (R) rates of Quercus ilex, Phillyrea latifolia, Myrtus communis, Arbutus unedo, and Cistus incanus was monitored in the period February 2006 to February 2007. The species investigated had low R and P N during winter, increasing from March to May, when mean air temperature reached 19.2 °C. During the favourable period, C. incanus and A. unedo had a higher mean P N (16.4±2.4 µmol m-2 s-1) than P. latifolia, Q. ilex, and M. communis (10.0±1.3 µmol m-2 s-1). The highest R (1.89±0.30 µmol m-2 s-1, mean of the species), associated to a significant P N decrease (62 % of the maximum, mean value of the species), was measured in July (mean R/P N ratio 0.447±0.091). Q10, indicating the respiration sensitivity to short-term temperature increase, was in the range 1.49 to 2.21. Global change might modify R/P N determining differences in dry matter accumulation among the species, and Q. ilex and P. latifolia might be the most favoured species by their ability to maintain sufficiently higher P N and lower R during stress periods.
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Claims 5
Claim · model-written summary
Cistus incanus had a higher mean net photosynthesis (16.4±2.4 µmol m-2 s-1) than P. latifolia, Q. ilex and M. communis in the favourable period.
- Taxon
- C. incanus
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Cistus incanuse1 - Outcome
- mean P Ne1
- Direction
- highere1
- Value
- 16.4±2.4 µmol m-2 s-1e1
- Qualifier
- during the favourable periode1
- Comparator
- P. latifolia, Q. ilex, and M. communise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e1“During the favourable period, C. incanus and A. unedo had a higher mean P N (16.4±2.4 µmol m-2 s-1) than P. latifolia, Q. ilex, and M. communis (10.0±1.3 µmol m-2 s-1)”
Claim · model-written summary
Arbutus unedo had a higher mean net photosynthesis (16.4±2.4 µmol m-2 s-1) than P. latifolia, Q. ilex and M. communis in the favourable period.
- Taxon
- A. unedo
Arbutus unedoe1 - Outcome
- mean P Ne1
- Direction
- highere1
- Value
- 16.4±2.4 µmol m-2 s-1e1
- Qualifier
- during the favourable periode1
- Comparator
- P. latifolia, Q. ilex, and M. communise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“During the favourable period, C. incanus and A. unedo had a higher mean P N (16.4±2.4 µmol m-2 s-1) than P. latifolia, Q. ilex, and M. communis (10.0±1.3 µmol m-2 s-1)”
Claim · model-written summary
Highest leaf respiration (mean 1.89±0.30 µmol m-2 s-1) was measured in July.
Verbatim
t0“Mediterranean evergreen species”
e2“The highest R (1.89±0.30 µmol m-2 s-1, mean of the species)”
e4“was measured in July”
Claim · model-written summary
The highest respiration in July was associated with a significant decrease in net photosynthesis (62 % of the maximum).
Verbatim
t0“Mediterranean evergreen species”
e2“The highest R (1.89±0.30 µmol m-2 s-1, mean of the species)”
e3“associated to a significant P N decrease (62 % of the maximum, mean value of the species)”
e4“was measured in July”
Claim · model-written summary
Q10 of leaf respiration ranged from 1.49 to 2.21 across the Mediterranean evergreen species.
Verbatim
t0“Mediterranean evergreen species”
e5“Q10, indicating the respiration sensitivity to short-term temperature increase, was in the range 1.49 to 2.21”