The Temperature Characteristics Of Double Span Plastic Greenhouse

This experiment based on different regional environment factor in duplex plastic greenhouse was double, in order to understand crop growth environment, management and control. Test in plastic canopy temperature was based on double marginal effect the determination of boundary and the boundary changes over time, for double plastic canopy management and provide some theoretical basis for practical production, thus to improve the land utilization ratio and double plastic greenhouses provide a scientific basis for structure optimization. The main results are as follows:1. The compare of different ways of covering in duplex plastic canopy temperature change on the mainland was comparedThe meadow change of ground temperature in duplex plastic greenhouse was consistent, gradually rise, the low temperature in early February. In different period,the ground temperature of Point A, B, C, D, E, F were higher than A ’, B ’, C ’, D’, E’, F ’;the ground temperature of Point A, B, C, D, E, F were higher than A ’, B ’, C ’, D’, E’, F ’;the ground temperature of Point G ’, H’, ’I’,J’, K’, L ’ were higher than G, H, ’I,J, K, L;I ’point and I points, compared to other points of ground temperature difference is the largest.In Sunny and cloudy conditions, Point A, B, C, D, E, F, G, H, I, J, K, L, and point A ’, B ’, C’, D’, E ’, F, G’, H’, ’I, J’, K, L ’ground temperature variation rule are basically identical,Cloudy day temperature range is not big. In Sunny condition, at 2:00-6 hours, point A, B, D point of ground temperature is lower than A ’points,’ point B, D, the rest of the time point A, B, D points of ground temperature is higher than A ’, B ’, D;at 6 PM- 10:00 hours, C points of ground temperature is lower than C ’, the rest of the time, C point of ground temperature is higher than C ’;In different period of time, E, F, K, L ’points of ground temperature were higher than E’, F’, K’, L ’;At 2:00-10:00 hours, H ’point, I point, G’ and ’J’ points of ground temperature is lower than the H, I, G, J. The rest of the time points, I ’, G ’H’ and J ’points of ground temperature is higher than H, I, G, J. In cloudy condition, different period of point A, C, D, E, F, G ’, H’, ’I, J’, K’, L ’points of ground temperature were higher than A’, C’, D ’, E’, F ’, G, H, I, J, K, L;at 2:00-6 hours, B points of ground temperature is lower than ’B, the rest of the time point of ground temperature is higher than B’ point B.2. The compare of different ways of covering in duplex plastic air temperature change on the mainland was comparedThe meadow change of air temperature in duplex plastic greenhouse was consistent, gradually rise, the low temperature in early February. The ground temperature of Point A, B, C, D’, E’, F ’ were higher than A ’, B ’, C ’, D, E, F;E ’point and E temperatures in different periods were higher than the temperature of other points.In Sunny and cloudy conditions, Plastic canopy top temperatures generally higher than the middle, the middle of the generally higher than that of the lower temperatures, different vertical height of measuring point temperature variation rule, peaked at 14:00.In Sunny condition, at the time of 8:00, B(on) point temperature is higher than B’(on), at the time of 8:00, B(down) point temperature is equal to B’(down), at the time of 2:00, E(on) point temperature is higher than E’(on), at the time of 8:00;in other period of time, close to shed overlapping part of the temperature on the vertical height is higher than the corresponding part of the vertical height of the temperature.In cloudy condition, C(on) and C ’(on) point temperatures of the basic difference is small,D(on) and D ’(on) point temperatures of the basic difference is small,F(on) and F ’(on) point temperatures of the basic difference is small;in other period of time, close to shed overlapping part of the temperature on the vertical height is higher than the corresponding part of the vertical height of the temperature.3. The compare of different ways of covering in duplex plastic Soil temperature point change on the mainland was comparedThe change meadow of ground temperature points are different 。 In early observation,A point is greater than A ’, B ’point is greater than B, D point is greater than D ’, E point is greater than E ’; C point is Equal to C ’,F point is Equal to F ’. Ground temperature point presents the overall downward trend, In late march, Ground temperature point is 1. Ground temperature point is different at a day,A and A ’farthest point are at 2:00 – 6:00, 6 and 7 respectively;B and B’ farthest point are at 2:00 – 6:00, 8;C and C’ farthest point are at 8:00 – 10:00, 8;the longest boundary point of D is 7,at 08:00-10:00, the longest boundary points of D’ is 5 at16:00- 18:00 and 20:00- 22:00; the longest boundary point of E is 6,at 02:00-06:00 and 20:00-22:00, the longest boundary points of E’ is 7,at 02:00-06:00、16:00- 18:00 and 20:00- 22:00; the longest boundary point of F is 8,at 16:00-18:00, the longest boundary points of F’ is 7, at 2:00- 6:00.