| The facility cultivation as a cultivation structure method is applicated widely during the winter and summer, but different structures cause environmental index difference. Ningxia active storage wall of solar greenhouse (hereinafter referred to as the model) is made by an air-wall heat exchange storage system. In Test 1, based on determination of the new-type greenhouse environmental indicators, plant physiological and morphological index, fruit quality and yield, then contrasted with the normal greenhouse. Finally contrasted and analysised the differences of the two greenhouses using by the SPSS software, with Duncan’s repeated method were tested for very diffirent significance. In Test 2, explored the environmental advantages on large span double arch film structure of new hot galvanized plastic greenhouse, analyzed the environment seasonal difference on different span single and double plastic greenhouse. The test will be divided into two seasons:summer and winter.The 10 m span single membrane covered plastic shed as control, the other five spans are 20 m,16 m,12 m,10 m and 8 m double plastic film greenhouse,To test air temperature, humidity, light intensity,10 cm soil temperature, the carbon dioxide content of the index determination.The results of this study are as follows:1. solar greenhouse by using the air-wall heat exchange storage system increased the average of air temperature in the greenhouse of 1.98℃ than the ordinary greenhouse structure; increased average temperature 2.45℃; effectively increased the rate of intensity 13.4%.; but it is not obvious on humidity. The model greenhouse of wall increased heat nearly 3 times.2. compared with and the control plants growth:the modal greenhouse average height is 185.97cm, which is 46.53cm longer the modal. The modal greenhouse average stem diameter is 0.82cm, which is 0.12cm higher than the control. No matter what period, the modal chlorophyll content is higher than the control greenhouse, which the average is high of 3.30 SPAD. The average leaf area of modal greenhouse is 174.31 cm2; the control is 134.15 cm2, the modal is wider 40.16 cm2 than the control.3. Determination of photosynthetic results showed:the peak assimilation of the model greenhouse is 15.81 mmol/(M2×s), which is biger 5.43 mmol/(M2 ×s) than the control. The average assimilation of the modal greenhouse is 4.16 mmol/(M2×s) bigger than the control. The modal greenhouse stomatal conductance values is 675.60 mmol/(M2×s) greater than the control. The modal greenhouse average transpiration rate is 6.84 mmol/(M2×s), the control is 2.16 mmol/(M2×s), which compared with the modal is small 4.68 mmol/(M2×s). The average plant intercellular CO2 concentration of the control greenhouse is higher; the modal greenhouse is 339.46 mg/kg, the control is 363.67 mg/kg.4. The fruit quality:The content of soluble solid content, vitamin C, and organic acid content of the fruit of the new solar greenhouse was significantly different than that of the control greenhouse at 1% levels. The total soluble sugar of new greenhouse and control greenhouse had significant difference at the 5% level.5. Comparison on yield with the modal and the control greenhouse:average fruit weight of the modal is 0.29 kg bigger than the control greenhouse. Plot yield of the modal greenhouse is 8.00 kg/8.96m2 higher than the control. The modal greenhouse is more 595.54 kg than the control of every 667 m2.6. In summer,8 m,16 m,20 m span plastic greenhouse can reduce air temperature 1.15℃,0.94℃ and 0.59℃ respectively,and reduce Soil temperature 2.98℃,2.32℃,3.08℃ respectively. The light intensity of 10 m,16 m span plastic greenhouse are great.10m,12m,16m double span film greenhouse can maintain a high carbon dioxide concentration. Based on the above five factors,16m span plastic greenhouse has greater advantage, Which in the summer is more generalized.7. In winter, the 20 m span greenhouse air temperature is 5.57℃ higher than the control greenhouse, and soil temperature is the highest through the six greenhouses,for 2.98℃, whicn is more 4.68℃ than the others. In the Air humidity index,20 m span greenhouse of 84.21% of the air humidity is more fit with the needs of plant growth.20 m span greenhouse of monthly light intensity is the highest, which is more 3590.68 Ix than the minimum. But to maintain a higher carbon dioxide content is 16 m,12 m span greenhouse. Based on those 5 environmental factors, the 20 m span plastic greenhouse is more superior to the others in winter. |
PDF Full Text Request