Abstract
1 Understanding the effect of water deficit on plant respiration and its temperature sensitivity at long time-scales is important for anticipating the shift in ecosystem dynamics that is expected to occur as a result of climate change. 2 We investigated seasonal variations of leaf dark respiration and sensitivity to temperature in the upper and lower canopy of Quercus ilex trees in a forest stand that had been exposed to either 33% throughfall reduction or normal rainfall for the preceding 6 years. 3 For upper and lower canopy leaves, light-saturated photosynthesis and respiration at a reference temperature of 15 °C (R15) had the lowest values in late summer, when both traits were lower in trees subjected to throughfall reduction than in those subject to control conditions. Respiration acclimated to seasonal shifts in temperature, more intensively through summer than winter and in throughfall-exclusion than control trees. Foliar concentration of soluble sugars was positively correlated with R15 across seasons. 4 As leaf respiration decreased with increasing water deficit, and the relationship between water status and respiration did not differ between trees that had been exposed to 7 years of enhanced drought when compared with controls, we suggest that drier conditions projected for the Mediterranean may attenuate the stimulation of leaf respiratory CO2 release by global warming in Q. ilex forests.
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Claims 6
Claim · model-written summary
Photosynthesis and R15 were lowest in late summer.
- Taxon
- Quercus ilex
Quercus ilexe1 - Outcome
- light-saturated photosynthesis and respiration at a reference temperature of 15 °C (R15)e0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light-saturated photosynthesis and respiration at a reference temperature of 15 °C (R15) had the lowest values in late summer”
e1“Quercus ilex trees”
Claim · model-written summary
Throughfall reduction lowered late-summer photosynthesis and respiration.
- Taxon
- Quercus ilexQuercus ilexe1
- Treatment
- throughfall reductione0
- Outcome
- both traitse0
- Direction
- lowere0
- Comparator
- control conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both traits were lower in trees subjected to throughfall reduction than in those subject to control conditions”
e1“Quercus ilex trees”
Claim · model-written summary
Respiration acclimation was stronger in summer and under throughfall exclusion.
- Taxon
- Quercus ilexQuercus ilexe1
- Outcome
- Respiration acclimated to seasonal shifts in temperaturee0
- Direction
- more intensivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Respiration acclimated to seasonal shifts in temperature, more intensively through summer than winter and in throughfall-exclusion than control trees”
e1“Quercus ilex trees”
Claim · model-written summary
Soluble sugars correlated positively with R15.
- Taxon
- Quercus ilexQuercus ilexe1
- Compound
- soluble sugarse0
- Outcome
- R15e0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar concentration of soluble sugars was positively correlated with R15 across seasons”
e1“Quercus ilex trees”
Claim · model-written summary
Leaf respiration decreased with water deficit.
- Taxon
- Quercus ilexQuercus ilexe1
- Treatment
- water deficite0
- Outcome
- leaf respiratione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf respiration decreased with increasing water deficit”
e1“Quercus ilex trees”
Claim · model-written summary
Water status–respiration relationship did not differ after enhanced drought.
- Taxon
- Quercus ilexQuercus ilexe1
- Treatment
- 7 years of enhanced droughte0
- Outcome
- relationship between water status and respiratione0
- Direction
- did not differe0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“relationship between water status and respiration did not differ between trees that had been exposed to 7 years of enhanced drought when compared with controls”
e1“Quercus ilex trees”
The same questions in other papers
drought · physiology: water · Quercus ilex (holly oak)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 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.