日光温室内南侧土壤温湿度试验及防寒措施的优化

发布时间：2018-04-24 07:41

本文选题：日光温室 + 边际土壤　；参考：《内蒙古农业大学》2017年硕士论文

【摘要】：内蒙古冬季寒冷干旱,随着室外温度逐步降低,日光温室内的空气及土壤沿跨度会形成明显的温度梯度,导致室内植物出现生长周期延长以及分布不均匀现象。农业上认为:·因为环境因子成分不同,使得农田边际与中央植株之间存在差异。从这个意义上讲,日光温室内存在非常明显的"边际效应"。本文选取该地区典型的"三立一坡"型日光温室进行研究,首先进行测点布置设计,采用土壤传感器ms-10、空气传感器FLEX1000、辐射传感器YJ-SR100、小型气象站等试验仪器对试验中相关参数进行了实测。其次通过分析得到:有无拱棚的条件下日光温室内南侧土壤温度边际界点及土壤含水率变化,并进行土壤储热量计算,最后建立土壤模型并模拟。试验结果表明:增加内拱棚能够有效的提升温室内空气以及土壤的温度,同时对于土壤的"边际效应"具有明显的渐弱作用。当边际界点没有穿过内拱棚时,含水率变化速率为拱棚外大于拱棚内部,当边际界点穿透内拱棚后,含水率变化速率拱棚内部大于拱棚外部。对土壤温度进行储热量化分析结果表明:处在同一区域的测点,当土壤温度差值比较接近时,储热量与土壤含水率存在关系。而对于不同区域,应该考虑土壤温度对于储热的影响。最终利用CFD方法将模拟结果与实测结果对比验证了模型的准确性。
[Abstract]:With the decrease of outdoor temperature in winter in Inner Mongolia, the temperature gradient of air and soil along the span of greenhouse will be obvious, resulting in the growth cycle of indoor plants prolonged and uneven distribution phenomenon. In agriculture, because of the difference of environmental factors, there are differences between marginal farmland and central plants. In this sense, there is a very obvious "marginal effect" in solar greenhouses. In this paper, the typical "Sanli one Slope" type solar greenhouse in this area is selected for research. First, the design of measuring point layout is carried out. Soil sensor ms-10, air sensor FLEX1000, radiation sensor YJ-SR100 and small meteorological station were used to measure the relevant parameters. Secondly, with or without arched greenhouse, the variation of soil temperature marginal boundary point and soil moisture content in solar greenhouse was obtained, and the soil heat storage was calculated. Finally, the soil model was established and simulated. The experimental results show that increasing the inner arch shed can effectively raise the temperature of the air and soil in the greenhouse, and at the same time, the "marginal effect" of the soil is obviously weakened. When the marginal boundary point does not pass through the inner arch shed, the change rate of moisture content in the arch shed is greater than that in the arch shed, and when the marginal boundary point penetrates the inner arch shed, the water content change rate inside the arch shed is greater than that outside the arch shed. The results of heat storage quantitative analysis of soil temperature showed that when the difference of soil temperature was close, there was a relationship between heat storage and soil moisture content. For different regions, the effect of soil temperature on heat storage should be considered. Finally, the accuracy of the model is verified by comparing the simulation results with the measured results by CFD method.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S152.8

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