| 春秋分日保温被顶卷对南北向大棚内光照影响的模拟 |
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| 引用本文： | 范艺然,刘焕,闫征南,李晓野,杨延杰.春秋分日保温被顶卷对南北向大棚内光照影响的模拟[J].中国农业气象,2021,42(8):676. |
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| 作者姓名： | 范艺然 刘焕 闫征南 李晓野 杨延杰 |
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| 作者单位： | 青岛农业大学园艺学院，青岛 266109 |
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| 基金项目： | 山东省重点研发计划项目（2019GNC20208）；山东省2018年度农业重大应用技术创新项目（6682218040）；山东省农业科技园区产业提升工程项目计划（2019YQ018） |
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| 摘 要： | 选取跨度为12m、高4.2m的塑料大棚，研究模拟计算春秋分时一日内不同时间段保温被遮光阴影带在棚内东西向的移动位置和距离，模拟保温被顶卷对大棚内东西向不同位置光合有效辐射日总量（DLI）分布的影响，并对棚内遮光情况进行实测计算，分析棚内东西向DLI分布规律。模拟计算结果表明，大棚内东西向中点位置的DLI最小，为10.91mol·m−2·d−1。自中点处向东西各1m范围内为棚内DLI低值区域，由10.91mol·m−2·d−1变为12.20mol·m−2·d−1，上升了11.8%。向东西两侧距离中点越远DLI值越大，最大值为13.70mol·m−2·d−1，位于棚两侧边缘，距中点6m处。实测结果表明，大棚内DLI值也表现为东西向中点位置最小，为7.31mol·m−2·d−1，自中点处向东西各1m范围内为棚内DLI低值区域，由7.31mol·m−2·d−1变为7.56mol·m−2·d−1，上升了3.4%。向东西两侧距离中点越远DLI值越大，最大值为12.70mol·m−2·d−1，位于大棚两侧边缘，距中点6m处。DLI的实测值与模拟计算值变化规律基本一致，均表现为在大棚内中点位置最小，沿大棚中点向东西两侧各逐渐增加，且在光环境较差的季节，中间区域的DLI值过低会限制喜光作物的正常生长。
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| 关 键 词： | 保温被顶卷 塑料大棚 遮光阴影 光合有效辐射日总量（DLI） 光分区模拟 |
| 收稿时间： | 2020-12-01 |
Simulation of Influences of Thermal Insulation Quilt Top Roll on the Light Environment in the North-South Greenhouse on Equinox Day |
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| FAN Yi-ran,LIU Huan,YAN Zheng-nan,LI Xiao-ye,YANG Yan-jie.Simulation of Influences of Thermal Insulation Quilt Top Roll on the Light Environment in the North-South Greenhouse on Equinox Day[J].Chinese Journal of Agrometeorology,2021,42(8):676. |
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| Authors: | FAN Yi-ran LIU Huan YAN Zheng-nan LI Xiao-ye YANG Yan-jie |
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| Institution: | College of Horticulture, Qingdao Agricultural University, Qingdao 266109, China |
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| Abstract: | In order to figure out the influences of thermal insulation quilt on the light environment in different positions in the greenhouse, the light distributions in different positions (from east to west) in the greenhouse were analyzed. The simulation and actual measurement were conducted in the Spring and Autumn Equinox Day in this study. Shading from direct sunlight in greenhouse was studied through converting the three-dimensional solar altitude angle into two-dimensional angle. Moreover, the movement position and distance of the shading zone from east to west were calculated in the Spring and Autumn Equinox Day. The distribution of daily light integral (DLI) was simulated in the greenhouse in different positions. The simulated greenhouse span was 12m, the ridge height was 4.2m, and the length was 60m The steel arch above the ground was 16m long, the radius was 0.35m, and the diameter was 0.7m after the insulation was rolled up. Ethylene vinyl acetate (EVA) film with actual light transmittance at 65% was used in the greenhouse. The light intensity of different positions in the top roll of insulation quilt in greenhouse was measured and the DLI was calculated. The measured value was compared with the simulated value. The distribution of DLI at different positions in the east-west direction and the light distribution in the greenhouse were analyzed. The results based on the model showed that the DLI at the middle point in east-west direction of greenhouse was the smallest, which was 10.91mol·m−2·d−1. The DLI was lower within 1m from the middle point to east/west, which increased by 11.8% from 10.91mol·m−2·d−1 to 12.20mol·m−2·d−1. DLI increased with the increased distance from the middle to the east/west, and the maximum value was 13.70mol·m−2·d−1, which was 6m away from the middle point (the edge of the greenhouse). The measured results showed that the DLI in the greenhouse was also the smallest at the middle point of the east-west direction, which was 7.31mol·m−2·d−1. The DLI was also lower within 1m from the middle point to east/west, which increased by 3.4% from 7.31mol·m−2·d−1 to 7.56mol·m−2·d−1. Similar trends were observed in the measured results, and the maximum value was 12.70mol·m−2·d−1. The variation law of DLI in measured values was consistent with the simulated values, which were the smallest in the middle point of greenhouse, and DLI increased with the increased distance from the middle to the east/west. The DLI changed slightly in different positions from east to west in the greenhouse. However, this does not affect the accuracy of the simulation trend. The simulation values were consistent with the measured values. In conclusion, DLI in the middle region will restrict the growth of photophilic crops in the season with poor light environment, thus leading to light stress on the growth of vegetables and other light-loving crops in the greenhouse. |
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| Keywords: | Top roll of insulation quilt Plastic greenhouses Shading shadows Daily light integral Light distribution model |
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