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Simple and low-cost temperature gradient chambers (TGC) have been developed to study the effects of temperature on field crops. Providing a continuous one-way air flow along the long axis of the TGC, ...the air temperature rises gradually with distance from the inlet by sensible heat gain form solar radiation or supplementary heating cables. The chambers described here are 2m high, 3.6m wide and 18m long greenhouses with exhaust fans installed at one end and air inlets at the other end. The monthly mean temperature differences between the air inlet and the outlet resulted in 2 to 3℃ temperature increase during summer-crop seasons. Reducing the ventilation rate led to temperature increase, but did not increase the temperature gradient in the chamber. It became clear that the air flow velocity must be large enough to break an apparent back flow in the TGC induced by convection. Alteration of the air-soil temperature relationship was observed in the chamber in comparison to field conditions. This alteration appears to be inevitable in the TGC, since both longwave rediative heat loss and convective heat exchange are small in enclosures like a TGC.続きを見る
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Mendeley出力
KJ00004506851