Abstract
Canopy leaves assimilate CO2 more efficiently than leaves of under canopy. Since the canopy heights of tropical rain forests are high, the knowledge on the rate of photosynthesis in canopy leaves is limited. Thus, we focused on leaves of tropical canopy plants and measured diurnal changes of photosynthesis and stomatal conductance at Pasoh, Peninsula Malaysia. Access to the canopy level was performed by using a canopy walk way. The maximum photosynthetic rates were within the range detected in a number of temperate evergreen species. The maximum diurnal photosynthetic rate and stomatal conductance occurred in the early to mid-morning and then declined. The midday decrease in photosynthesis was caused by stomatal closure and also by biochemical limitations of photosynthesis. No marked differences in maximum rates of photosynthesis were not observed between dry and wet seasons. Furthermore, no seasonal changes of diurnal trends of photosynthesis and stomatal conductance were detected. From these results, we speculate that the annual photosynthetic rates of canopy leaves in tropical rain forests should be higher than the rates of leaves in temperate forests.
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Claims 9
Claim · model-written summary
Maximum photosynthetic rates fell within the range of temperate evergreen species.
Verbatim
e0“The maximum photosynthetic rates were within the range detected in a number of temperate evergreen species.”
t0“rain forest trees”
Claim · model-written summary
Maximum diurnal photosynthetic rate occurred in early to mid-morning and then declined.
Verbatim
e0“The maximum diurnal photosynthetic rate and stomatal conductance occurred in the early to mid-morning and then declined.”
t0“rain forest trees”
Claim · model-written summary
Stomatal conductance peaked in early to mid-morning and then declined.
Verbatim
e0“The maximum diurnal photosynthetic rate and stomatal conductance occurred in the early to mid-morning and then declined.”
t0“rain forest trees”
Claim · model-written summary
Midday photosynthesis decline was attributed to stomatal closure.
Verbatim
e0“The midday decrease in photosynthesis was caused by stomatal closure and also by biochemical limitations of photosynthesis.”
t0“rain forest trees”
Claim · model-written summary
Midday photosynthesis decline was also attributed to biochemical limitations.
Verbatim
e0“The midday decrease in photosynthesis was caused by stomatal closure and also by biochemical limitations of photosynthesis.”
t0“rain forest trees”
Claim · model-written summary
The abstract ambiguously reports no marked dry versus wet seasonal difference in maximum photosynthetic rates.
Not reportedDirection
Verbatim
e0“No marked differences in maximum rates of photosynthesis were not observed between dry and wet seasons.”
t0“rain forest trees”
Claim · model-written summary
No seasonal change in diurnal photosynthesis trend was detected.
Verbatim
e0“no seasonal changes of diurnal trends of photosynthesis and stomatal conductance were detected.”
t0“rain forest trees”
Claim · model-written summary
No seasonal change in diurnal conductance trend was detected.
Verbatim
e0“no seasonal changes of diurnal trends of photosynthesis and stomatal conductance were detected.”
t0“rain forest trees”
Claim · model-written summary
The authors speculated tropical canopy leaves have higher annual photosynthesis than temperate forest leaves.
Verbatim
e0“we speculate that the annual photosynthetic rates of canopy leaves in tropical rain forests should be higher than the rates of leaves in temperate forests.”
t0“rain forest trees”