A Handy Assimilation Chamber Following Up Fluctuations in Ambient Air Temperature

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An assimilation chamber whose inside temperature could be controlled was made to measure the photo-synthesis, respiration and transpiration of forest trees <I>in</I> situ. The switching power supply system was used in thermomodule circuit, which reduces the weight of the apparatus and make it easier to handle even in a primeval forest on steep mountain.<BR>Deviation from the desired temperature during a 10-hour run was ±0.2°C under a constant thermal load (100 cal/min) . The settling time for the step input of temperature (28°C→23°C) was within 3 minutes and that of the load (100 cal/min→0 cal/min) was within half a minute.<BR>The chamber was used to measure the photo-synthesis of intact sun leaves in a natural beech stand. The inside temperature closely followed the ambient air temperature with only a deviation of ±0.3°C during the day with fluctuating irradiations of sunlight.
日本生物環境工学会の論文