两膜一苫拱棚管理方便,投资少,只要能根据当地气候特点和规律,将严冬时最低棚温保持在5℃以上,就可以进行冬季蔬菜生产。1)结构。东西向的拱棚,冬季和早春温度均匀,整体受光弱,蔬菜生长比较整齐,便于一次性采收上市。东西向拱棚,在低温弱光地区,棚距应不低于棚高,一般为3m,如果 As soon as the two membranes are properly controlled by the shed, the investment is small, and as long as the minimum shed temperature can be kept above 5 ° C in winter, the winter vegetable production can be conducted according to the local climate characteristics and laws. 1) Structure. Shed east-west, winter and early spring temperature uniformity, the overall weak light, vegetables grow more tidy, easy one-time harvest market. Shed to the east-west, in the low-temperature low light areas, shed should not be less than shed high, usually 3m, if