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以内蒙古标准“三立一坡”型日光温室为研究对象,对距离南侧边际0~350cm,深0~55cm范围内的土壤温度进行实测,绘制了有内拱棚以及无内拱棚测试土壤层温度特性曲线,并分析了土壤温度边际效应随外界环境变化的规律,同时建立一种含有内拱棚的日光温室南侧区域土壤温度计算模型。结果表明:除南侧边际10cm测点外,内拱棚的增加对5cm土壤层温度平均提升1.7℃左右,对25cm处土壤层温度平均提升1℃左右,而对于深度55cm处的土壤温度几乎没有影响。在距南侧边际70cm处增加内拱棚,不仅有效推迟边际界点内移,而且当室外温度降至均值-18℃,含拱棚的日光温室边际界点比不含内拱棚的小于60cm左右。采用Gambit建立模型,运用流体力学CFD(computational fluid dynamics)模拟含内拱棚不同土壤层温度,此模型能够较准确的模拟日光温室南侧边际不同层土壤温度,为种植作物提供有效理论依据。
Taking Inner Mongolia standard “Sanyi-Slope ” type solar greenhouse as the research object, the soil temperature in the range of 0 ~ 350cm and depth 0 ~ 55cm from the southern margin was measured and the soil with inner arch and no arch was plotted Temperature characteristic curves of soil temperature and analyzed the law of the marginal effects of soil temperature with the changes of the external environment. At the same time, a soil temperature calculation model of the south side of greenhouse was established. The results showed that except for the 10 cm measuring point on the southern side, the increase of the inner arch increased about 1.7 ℃ on average for the 5cm soil layer and about 1 ℃ on the soil layer at 25cm depth, but had little effect on the soil temperature at the depth of 55cm . The increase of the inner arch at 70cm from the south margin not only effectively delayed the internal migration of the marginal boundary point, but also decreased the average temperature to -18 ℃. The marginal boundary point of the greenhouse with the arch was less than 60cm without the arch. Using Gambit to establish a model and using CFD (computational fluid dynamics) to simulate the temperature of different soil layers with insoles, this model can simulate soil temperature in different layers at the south of solar greenhouse more accurately and provide an effective theoretical basis for planting crops.