|Title:||Differences in Radiation and Temperature in Row Tunnels of Different Covering Materials||Other Titles:||不同被覆材質隧道式簡易設施內光輻射及溫度之變化||Authors:||Chwen-Ming Yang
|Keywords:||Seasonal difference;Radiation;Temperature;Covering material;Row tunnel;季節變化;光輻射;溫度;被覆材質;隧道式設施||Issue Date:||Feb-2000||Publisher:||中華農學會||Journal Volume:||1||Journal Issue:||1||Start page/Pages:||119-129||Source:||中華農學會報||Abstract:||
The use of row covers/tunnels With polymers has made the controlling Of weather elements possible, yet the actual conditions mainly on spectral properties of covering materials, study adopted three of materials. nonwoven fabric (NWF), ordinary transparent polyethylene (PE), and UV-filtered polyethylene (UV-C), to analyze and monitor variations in radiation and temperature row tunnels of different coverings in the field. Results show that covering materials selected for the study have varied spectral properties but allow than in average. tested in laboratory. Of radiation transmitted through materials. Spectral properly Of CV-C plastic is similar to ordinary PE film, it absorbs rn0re than of ultraviolet (below 415 nm). NWF reflects (12.6%) more radiation than Others (PE 8.5%, UV-C 8.1%) but absorbs the least (0.4%. relative to 2 and for PE and UV-C respectively). Data further indicate that radiant energy and proportions of transmittance in various bandpasses have been changed after through the covering materials in the field. In average. transmittance was reduced 9.1, 18.3, and for PE (895% 10 81.4%), UV-C (SS. to 69.S%L and SWF (83m to respectively. UV region was again greatly filtered by UV-C following its spectral property. Correlation between irradiance and air temperature inside the tunnels was linear for materials, implying existence of greenhouse effect in the tunnels, The relationship of air temperature to soil was also linear and positively correlated, soil temperature was lowered In tunnels than in outdoor at the same air temperature due to the covering of silver plastic over the raised ked.
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