Test Of The South Side Soil Temperature And Humidity In Solar Greenhouse And Optimization Of Cold-proof Measures

Mongolia is cold and drought in winter,as the outdoor temperature gradually decreased,the soil along the span and the air inside can format the obvious temperature gradient in the solar greenhouse,T his phenomena cause indoor plant growth cycle extension and uneven distribution.Agriculture think:because of different environmental factors composition,make marginal farmland and the differences between the central plant.In this sense,the sunlight is very obvious in greenhouse "marginal effect".This article selects the region a typical "three set up a slope" type solar greenhouse was studied,and the first measuring point layout design,a soil sensor-10 ms,air sensor FLEX1000,YJ-SR100 radiation sensor,small stations and other related parameters in test instrument to test were measured.Second is obtained by analysis:the presence of tunnel under the condition of sunlight greenhouse in south marginal point of soil temperature and soil moisture content,soil heat storage and computing,finally soil model is established and simulated.The results showed that the increase in tunnel can effectively improve air and soil temperature in greenhouse,at the same time for the "marginal effect" of the soil has obvious gradually weak.When marginal point not through the tunnel inside,outside of tunnel is greater than the changing rate of moisture content inside the tunnel,when the marginal point through the tunnel after tunnel internal moisture content change rate is greater than the outside of the tunnel.On soil temperature reservoir quantitative analysis results show that the measuring point in the same area,when soil temperature difference value close to store heat and relationship between soil moisture content.For different areas,the effect of soil temperature on heat storage should be considered.The accuracy of the model is verified by comparing the simulation results with the measured results by using CFD.