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地温偏低经常是制约日光温室冬季蔬菜正常生产的一个重要环境因素,尤其是遇到连阴天后,提高温室地温的难度更大。土壤由于热惰性大,提高地温需要的热量也相应较多,直接从空气中获得热量,并将热量保存在土壤中传热的效率很低,需要的时间也很长。所以,实际生产中,很少主动采用加热室内空气的方法来提高地温,而更多的方法是直接将散热器铺设到地面或土壤中,增温的效率更高。提高温室地温的方法有很多种,如电热线加温、生物反应堆增温、地中热交
Low ground temperature is often an important environmental factor restricting the normal production of winter vegetables in solar greenhouse, especially in the face of cloudy days, to increase the temperature of the greenhouse more difficult. Due to the large thermal inertia of soils, the heat needed to increase the ground temperature is correspondingly higher. It is very inefficient and time-consuming to obtain heat directly from the air and keep the heat in the soil. Therefore, in actual production, seldom take the initiative to use the method of heating the room air to increase the ground temperature, and more methods are more directly to the radiator laying on the ground or soil, warming more efficient. There are many ways to improve the greenhouse floor temperature, such as electric heating, bio-reactor warming,