Effects Research Of Microclimate Antifreeze On Fragrant Pear Trees Covered By Striped Cloth In Winter

The renowned Korla fragrant Pear is one of the characteristics of agricultural leading industries.In recent years, Korla fragrant Pear trees had frequent Freezing injury caused serious influence to the development of Fragrant Pear industry in the winter.In order to discuss the defense freeze injury effective of fragrant pear trees had covered by striped cloth in winter, the orchard located on korla households town o’hara Sue village, using HOBO temperature and humidity loggers、the tree body temperature instruments, the change rules of air temperature, relative humidity, the tree body temperature and ground temperature elements of inside and outside of the pear trees covered by striped cloth comparison between continuous observation in winter, the main results obtained were as follows:1.The results show that the temperature effect: The korla fragrant pear tree had covered by striped cloth in Winter so that the inside shed of a different height between the average daily temperature, maximum temperature, minimum temperature were higher than that outside, and the daily average temperature and daily maximum temperature of warming with altitude increasing the temperature gradually rised, shed daily minimum temperature of warming gradually increasing temperature decreases with height. The inside Shed daily average temperature higher 0.5 to 1.0 ℃ than those outside, extreme maximum temperature was higher 0.5 ℃ to 7.4 ℃, extreme minimum temperature was higher 0.3 to 1.1 ℃. The inside Shed of ≤-20 ℃ appeared a few days, the cumulative duration, maximum duration is significantly less than that outside, and 0.4 m height by most, indicating the pear trees covered by striped heat preservation effect of warming, to reduce or avoid the occurrence of frost injury. The average daily change in temperatures in the inside was " unimodal " type, but the temperature difference between the shed during the day at different heights greater than that outside, the temperature difference between the height of the night differently than outside small. Those sunny, cloudy and clouds conditions temperature difference were relatively large during the day, the difference was small at night; The extreme minimum temperature of cloudy inside at different heights significantly larger than that outside, the cloth covered by striped so cloudy insulation works best. The inside and outside shed highest daily maximum and minimum temperature was significant correlation between, through the meteorological observatory data can predict inside shed temperature.2.The relative humidity results show that the average relative humidity 、the average daily maximum relative humidity, the average daily minimum relative humidity were lower than that outside, the inside and outside relative humidity changes different with the increasing of height. That inside and outside relative humidity diurnal variation showed a "single trough" type, the inside relative humidity difference between different at heights larger than that outside during the day. Those Sunny, cloudy and cloudy days relative humidity with different height between were higher than that outside; Sunny days than the maximum relative humidity of the shed that outside early 0.5 h, the minimum daily time appears substantially simultaneously; cloudy shed relative humidity day appears longer than the maximum hysteresis that outside 1 h, the minimum value that outside hysteresis 0.5 h.3. The tree body temperature results show that the relative average tree, the trunk, tree branches sunny side average temperatures, extreme maximum temperatures were higher than the night side, extreme minimum temperature on the sunny side and night side almost the same. The inside trunk, branches on the sunny side and the average temperature was higher than that outside the night side, the inside shed tree trunk sun side average temperature was higher 1.1 ℃ than outside, the average temperature of shed trunk night side higher 1.0 ℃ than outside. The inside shed tree branches on the sunny side average temperatures higher 1.8 ℃ than that outside, the average temperature of shed branch night side higher 1.6 ℃ than outside, illustrate cloth covered by striped also improved the tree temperature and played a thermal warming effect, reduce or avoid the occurrence of frost injury. The inside and outside average change branches in different directions daily temperature showed a "single peak" type, shed the outer surface temperature is higher than the male branch night side, sunny side and night side temperature difference is small, the night temperature nearly equal.4. Based on 2013-2014 year the inside and outside shed soil temperature analysis shows that the inside shed 5 cm average temperature, extreme maximum ground temperatures were lower than that outside, and the inside shed 10 cm average temperature, extreme minimum ground temperature higher than that outside, the inside and outside shed extreme minimum ground temperature almost equal and 10 cm ground temperature day amplitude was significantly less than that outside.