防寒沟的作用地温的高低和变化对作物发芽、生长、越冬等方面有直接的影响。国外有大量试验也说明:作物出叶速度主要受地温的支配与气温关系不大。历年来对采用保护地设施增加气温作过多种研究试验,但对地温的保护尚缺乏研究。1975年以来我们对不同类型的温室作了防寒沟设施的试验即在温室四周用砖砌成深0.8米、宽0.2米的沟(如图1)。主 The role of cold furrow The level of ground temperature and changes in crop germination, growth, winter and so on have a direct impact. A large number of foreign experiments also show that: the main crop temperature is dominated by the temperature and the temperature does not matter. Over the years on the use of protected facilities to increase temperature for a variety of research experiments, but the protection of ground temperature is still lack of research. Since 1975, we have conducted experiments on different types of greenhouses to cold out the ditch facilities, which are made of brick with a depth of 0.8m and a width of 0.2m around the greenhouses (Figure 1). the Lord