Abstract:

The fitting relation among the temperature, external temperature, cloudiness, sunshine hours and radiation have been analysed, utilizing the temperature and external temperature of agricultural science and technology park greenhouse in Ansai in winter from 2007 to 2008 and 2008 to 2009, and the meteorological data in Ansai and Yanan. The results indicate that the maximum temperature was affected by climate background, the temperature increases very easily in fine weather, and maintained at a high level; but it is lower in overcast and fine weather environment. The maximum temperature with the daily global radiation and the sunshine hours showed non-lineal functional relationship, in overcast and fine weather background, the radiation value less than 5.50MJ?m-2, or the sunshine hours less than 4h, or the daily total cloud cover more than 80%, the temperature is below 20℃, then influences the vegetable's normal growth. The fitting equation of the maximum temperature and external radiation is y=9.5259+2.2265x-0.065184x2 in overcast and fine weather background, and it is y=8.7456lnx+10.76 when sky is clear. The relation between the minimum temperature and the ambient temperature is very close, the fitting equation is different in different weather conditions. It’s the best to use linear formula between sunny day and the first shining day after overcast, the fitting equation is y=0.3736x+14.176 in fine day, and it is y=0.61x+12.764 in the first shining day after overcast. It is possible to decrease the temperature below 0℃ when the ambient temperature dropped to below -20℃, and occurred frozen injury. It can be used external temperature fitting the temperature at the same time in continuous cloudy-weather, and the exponential function relations fitting is the best, the fitting equation is y=10.804e0.04x.