TEMPERATURE GRADIENT CHAMBERS FOR RESEARCH ON GLOBAL ENVIRONMENT CHANGE : II. DESIGN FOR PLOT STUDIES

概要

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Temperature gradient chambers (TGC) offer technology to study a large number of plants grown under a range of temperatures. Heating of air flowing through the TGC results in a continuous gradient of increasing temperature. However, the existence of the continuous temperature gradient makes the establishment of specific temperature treatments and the interpretation of the results difficult. A major objective of the TGC design reported in this paper was to establish individual temperature plots (5.5m L×4.3m W) within the TGC. These plots were obtained by installing overhead paddle fans at intervals in the TGC to define the boundaries of the temperature plots. Disruption of the natural convective back flow in the TGC by these fans and the addition of supplemental heat at these points resulted in approximate step changes in temperature at the plot boundaries. The TGC has been used to establish four temperature treatments: +0, +1.5, +3.0, +4.5℃. Approximately a 1℃ step change in temperature occurred at the plot boundaries and a 0.5℃ temperature-gradient increase occured in each plot. A CO_2 release system has also been incorporated into the TGC design. This TGC system has proven to be inexpensive to construct and reliable under long-term operation.
九州大学の論文