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目前,我们上海县普遍推广应用的蔬菜保护地设施是镀锌管结构的中管棚,宽6米,高2.5米,长30米左右,面积0.3亩,呈拱形,占全县中棚设施的80%。蔬菜中管棚因有塑料薄膜覆盖,故有以下四个作用:一是防霜防雪,增温保温性能好。据观测,1月份棚内平均气温6.9℃, 2月份为8℃,3月份为12.2℃,棚内平均气温比露地提高2～3℃,最高可增加8.7～11.4℃。
At present, the facilities for the protection of vegetables in Shanghai, which are widely popularized and applied, are the middle tube shed with a galvanized pipe structure of 6 meters in width and 2.5 meters in height with a length of about 30 meters and an area of 0.3 mu. Of the 80%. Vegetables in the shed due to plastic film coverage, it has the following four roles: First, frost-proof snow, warm insulation performance. According to the observation, the average temperature of greenhouse in January was 6.9 ℃, 8 ℃ in February and 12.2 ℃ in March. The average temperature in the greenhouse increased by 2 ~ 3 ℃ and the highest temperature increased by 8.7 ~ 11.4 ℃.