| Taking open -air tea garden, greenhouse tea garden covered with ordinary agricultural film as control,
studied physiological and ecological effects of greenhouse tea garden covered with light conversion film and supplement of
CO2 gas during low temperature period in winter and spring. The results showed that the effect of maintaining temperature
and increasing humidity of light conversion film was slightly better than ordinary film. From January to March, compared
with open-air tea garden, average temperature of greenhouse increased by 2.8-3.4益,3.1-3.9益,1.3-1.9益, average humidity
was higher than open-air tea garden by 5.0-10.4 percent. Compared with open-air tea garden, light intensity of greenhouse
decreased by 7.9%-30.2%, the transmittance of light conversion film was slightly lower than ordinary film, but the net
photosynthetic rate, stomatal conductance, transpiration rate of tea tree in greenhouse covered with light conversion film
were significantly higher than those in ordinary film greenhouse, slightly lower than those in open-air tea garden. Light
conversion film combined with CO2 supplement could significantly increase photosynthesis of tea tree and tea production. In
light conversion film greenhouse, tea shoots sprout stage, spring tea start picking period were earlier than ordinary film
greenhouse tea garden by 6-7 days, earlier than the open-air tea garden by 23-27 days; compared with open-air tea
garden, yield of Mingqian tea (means tea produced before Ching Ming Festival) increased by 51.2%-56.2%, spring tea
yield increased by 33.3%, it overcome the defects of covering film solely resulted spring tea production declined in past.
Greenhouse tea garden covered with film during cold period in winter and spring had no adversely effect on annual tea
production. Tea garden covered with light conversion film
was conducive to carbon assimilation, water extract,
polyphenols, soluble sugar content of tea increasing, so
promoted strength and sweetness of tea soup. After covering
light conversion film, climate change could inhibit
reproduction of tea leafhopper (Empoasca vitis Gothe) and
tea aphid (Toxoptera aurantii Boyer). |
