Analysis on the Microclimatic Characteristics of Sunlight Greenhouse Based on Automatic Meteorological Observation Station

Based on the automatic observation data of greenhouse automatic meteorological station and the outdoor meteorological data at the same time,the influencing environmental factors on the microclimate in sunlight greenhouse were analyzed.And the results showed that the temperature in greenhouse was obviously higher than the outdoor temperature and the daily average temperature in the greenhouse showed the single-wave peak changes.The relative humidity in December and in January of the next year was higher.So ventilation was necessary and the diseases and pests of vegetables in greenhouse should be avoided.The maximum value of total radiation irradiance in Jan,Feb and Mar all occurred at 12 o'clock,while that in Dec occurred at 13 o'clock.The ground temperature in 0 and 5 cm shallow layers of greenhouse had greater changes and the ground temperature changes in 5 cm shallow layer were smaller than the surface ground temperature.The ground temperatures in 20 and 40 cm deep layers basically maintained to be stable and they were higher than the ground temperature in the above layers,which indicated that deep-layer soil had certain thermal retention.Under different weather conditions,the change laws of temperature in greenhouse were analyzed.This research provided scientific basis for regulating the microclimate environmental factors in greenhouse and guiding the production of crops in greenhouse.