
TY  - JOUR
A1  - Doley, D 
A1  - Unwin, GL 
A1  - Yates, DJ 
T1  - Spatial and Temporal Distribution of Photosynthesis and Transpiration by Single Leaves in a Rainforest Tree, <I>Argyrodendron peralatum</I>
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 1988
VL  - 15
IS  - 2
SP  - 317
EP  - 326
KW  - 
UR  - https://doi.org/10.1071/PP9880317 
N2  - The light environments and rates of photosynthesis by leaves of Argyrodendron peralatum (F. M. Bailey) I.H. Boas were examined at eight positions within a natural rainforest canopy. Daily integrals of irradiance at leaf surfaces expressed as a percentage of that reaching a horizontal sensor in the open decreased from about 50% in the uppermost leaves to about 20% at a point 2 m below the top of the crown and to 10-15% in the lower crown and understory. Leaves in the upper crown had maximum instantaneous rates of apparent photosynthesis of 11.5 µmol CO2 m-2 s-1, whilst leaves in the lower crown of the same tree, and in understory saplings had maximum photosynthesis rates of 8.2 µmol m-2 s-1. These rates were not significantly different, and are within the range observed in a number of rainforest species characteristic of later successional stages. Under conditions of adequate water supply, photosynthetic rate was light-saturated by 500 µmol quanta m-2 s-1, irrespective of level in the canopy. 
ER  -

