A numerical simulation using FLUENT was used to monitor field temperatures under a film-soil system of potato sowing with white film mulching and soil covering the seed band in the Dingxi district. The results showed that, with an increase in the solar altitude angle, the surface temperatures of the ridge increased gradually from East to West, and the heat transferred from the surface to the deep soil. It was found that soil temperatures within 20 cm of the ridge surface was greatly affected by solar radiation and air temperature changes. With an increase in depth, the lag effect on temperature changes became more prominent. Soil temperatures under mulching film on the seed band were lower than those under mulching film without covering soil, which indicates that covering the seed band with soil in using film mulching can effectively avoid scorching the buds and seedlings due to high temperatures. At 16:46 h, soil temperature at 5 cm below the surface of the East and West seed bands reached their peak temperatures of 312.09 and 311.0 K, respectively. At 19:16 h, soil temperatures at 5, 10, 15, 20 and 25 cm depth in seed bands were 309.28, 304.94, 298.05, 293.64, 290.49 and 308.66, 303.42, 297.70, 292.70, 289.67 K, respectively. Simulated soil temperatures at different depths in seed bands of potato ridge for 5 consecutive sunny days were compared with the measured temperatures. The relative error was less than 5.5%, indicating that the simulation method was reliable. This study is of significance to the growth-promoting techniques of mulched potato sowing, and in constructing a film-soil system which facilitates potato sprouting.

中文翻译：

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白膜覆盖种子带覆盖马铃薯垄播土壤温度场模拟。

利用FLUENT进行的数值模拟监测了定西地区马铃薯播种的膜-土壤系统的田间温度，该系统采用白膜覆盖和土壤覆盖种子带。结果表明，随着太阳高度角的增加，洋脊的表面温度从东向西逐渐升高，热量从地表传递到深层土壤。发现在山脊表面20厘米以内的土壤温度受到太阳辐射和空气温度变化的极大影响。随着深度的增加，对温度变化的滞后效应变得更加突出。种子带覆盖膜下的土壤温度低于不覆盖土壤的覆盖膜下的土壤温度，这表明采用地膜覆盖土壤覆盖种子带可以有效地避免由于高温而使芽和幼苗焦化。在16:46 h，东西种子带下方5 cm处的土壤温度分别达到峰值温度312.09和311.0K。在19:16 h，种子带中5、10、15、20和25 cm处的土壤温度分别为309.28、304.94、298.05、293.64、290.49和308.66、303.42、297.70、292.70、289.67 K. 将连续5个晴天的马铃薯种子带中不同深度的模拟土壤温度与测得的温度进行比较。相对误差小于5.5％，表明仿真方法可靠。这项研究对于地膜覆盖马铃薯播种的生长促进技术具有重要意义，