Physics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004adspr..34.1466k&link_type=abstract
Advances in Space Research, Volume 34, Issue 7, p. 1466-1469.
Physics
3
Photosynthesis Of Plant Canopies, Elevated Co2 Levels, Air Circulation, Plant Culture System, Tomato
Scientific paper
To obtain basic data for adequate air circulation for promoting plant growth in closed plant production modules in bioregenerative life support systems in space, effects of air velocities ranging from 0.1 to 0.8 m s-1 on photosynthesis in tomato seedlings canopies were investigated under atmospheric CO2 concentrations of 0.4 and 0.8 mmol mol-1. The canopy of tomato seedlings on a plug tray (0.4×0.4 m2) was set in a wind-tunnel-type chamber (0.6×0.4×0.3 m3) installed in a semi-closed-type assimilation chamber (0.9×0.5×0.4 m3). The net photosynthetic rate in the plant canopy was determined with the differences in CO2 concentrations between the inlet and outlet of the assimilation chamber multiplied by the volumetric air exchange rate of the chamber. Photosynthetic photon flux (PPF) on the plant canopy was kept at 0.25 mmol m-2 s-1, air temperature at 23 °C and relative humidity at 55%. The leaf area indices (LAIs) of the plant canopies were 0.6-2.5 and plant heights were 0.05-0.2 m. The net photosynthetic rate of the plant canopy increased with increasing air velocities inside plant canopies and saturated at 0.2 m s-1. The net photosynthetic rate at the air velocity of 0.4 m s-1 was 1.3 times that at 0.1 m s-1 under CO2 concentrations of 0.4 and 0.8 mmol mol-1. The net photosynthetic rate under CO2 concentrations of 0.8 mmol mol-1 was 1.2 times that under 0.4 mmol mol-1 at the air velocity ranging from 0.1 to 0.8 m s-1. The results confirmed the importance of controlling air movement for enhancing the canopy photosynthesis under an elevated CO2 level as well as under a normal CO2 level in the closed plant production modules.
Kitaya Y.
Kiyota M.
Shibuya Tetsuo
Yoshida Makiko
No associations
LandOfFree
Effects of air velocity on photosynthesis of plant canopies under elevated CO2 levels in a plant culture system does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Effects of air velocity on photosynthesis of plant canopies under elevated CO2 levels in a plant culture system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effects of air velocity on photosynthesis of plant canopies under elevated CO2 levels in a plant culture system will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1838729