河套地区不同套膜方式对塑料大棚保温性能的影响

摘要：针对河套地区塑料大棚土地利用率低、冻害频发、一茬有余、两茬不足的问题，选择同一地点结构相同、保温措施各不相同的3栋塑料大棚（大棚D1采用底围裙膜、屋脊状顶膜、地膜覆盖；D2采用底围裙膜、屋脊状顶膜、小拱棚膜、地膜覆盖；D3采用底围裙膜、小拱棚膜、地膜覆盖）作为研究对象，连续监测并分析了大棚内气温变化情况。结果表明：河套地区使用D2套膜方式的塑料大棚保温性能最优，D1次之，推荐选择这2种套膜方式作为大棚保温措施，可实现棚内作物一年两茬两熟、降低冻害发生率；D3做为现大棚保温主流模式，其保温性能显著低于D1和D2，建议改进。

Effect of different film covering methods on thermal insulation performance of plastic greenhouse in Hetao Area

In view of of low land utilization rate, frequent happen of freezing injury, more than one crop and insufficient two crops in the plastic greenhouse in Hetao area, select 3 plastic greenhouses with the same structure and different thermal insulation measures in the same place (D1 is covered with bottom apron film, ridge shaped top film and plastic film; D2 is covered with bottom apron film, ridge shaped top film, small arch shed film and plastic film; D3 is covered with bottom apron film, small arch film and plastic film) as the research object, the temperature change in the greenhouse was continuously monitored and analyzed. The results showed that: In Hetao area, D2 film mulching method is the best, followed by D1. It is recommended to select these two methods as greenhouse insulation measures, which can achieve two crops a year and reduce the incidence of freezing injury; D3, as the mainstream mode of greenhouse insulation, has significantly lower thermal insulation effect than D1 and D2, so it is suggested to improve.