温室和管棚等蔬菜保护地设施加置二道膜,是由上海温室设备制造厂试制成功的。为测定其保温效果,我们于1988年1月23日至2月20日,各选择2次冷空气过程,分别对上海市长征乡的温室二道膜和中日设施园艺试验场的管棚二道膜进行对比测试,以鉴定二道膜的冬季保温效应。 Greenhouses and pipe sheds and other vegetable protection facilities plus two membrane, by the Shanghai greenhouse equipment factory trial success. In order to determine the effect of heat preservation, we chose two cold air processes from January 23 to February 20, 1988, respectively, to control the greenhouse two membrane of Changzheng Township and the pipe shed of Sino-Japanese facility horticultural test site Membrane comparison test to identify the two membranes in winter insulation effect.