【摘要】 大棚内主要生态因子变化特点是光照减弱,聚乙烯无滴膜透光率47.46%⁶5.77%,阴天高于晴天;空气相对湿度升高,棚内外湿度差,晴天大于阴天;温度和CO₂浓度日变化幅度增大,天气晴好、光合眭盛时,密闭大棚内CO₂浓度极度降低,可成为光合作用的主要限制因素;棚内不同空间位点各种生态因子存在明显差异。更多还原

【Abstract】 The characteristics and variation of main ecological factors in the plastic greenhouse were studied.Results showed that the light intensity was lower than that in open field because of the shelter film blocking;the sunlight transmittance of PE film was 47.46%⁶5.77%and it was higher in cloudy days than that in sunny days;RH in the plastic greenhouse was higher and the RH difference between inside and outside the greenhouse was bigger in sunny days;the temperature and CO₂ concentration fluctuated in a much wider range during a day;in addition,the ecological factors in the different air space of the greenhouse varied obviously.更多还原