利用日光温室生产冬春茬喜温性蔬菜，其主要矛盾是冬季光照强度差、光照时间短和棚内气温低。据此廊坊市农林局设计出“廊坊４０型”高效节能日光温室。据１９９８年对１０栋“廊坊４０型”日光温室，及１９９９年１５０栋和２０００年６３００栋的试验示范棚抽样调查，均表现 The use of sunlight greenhouse production of winter and spring warmth vegetables, the main contradiction is the poor light intensity in winter, the light time is short and the shed temperature is low. Accordingly, Langfang Agriculture and Forestry Bureau designed “Langfang 40” energy-efficient solar greenhouse. According to a sample survey of 10 “Langfang 40” solar greenhouses in 1998 and the pilot demonstration shelters of 150 buildings in 1999 and 6,300 buildings in 2000, both showed