北方石榴冷棚内外气温和土壤湿度变化规律研究

Study on Change Laws of Air Temperature and Soil Moisture in Pomegranate Cold Shed in North China

本试验以北方石榴冷棚为研究对象,在1月份对其内外气温及土壤湿度的最高值、最低值、温湿度差、平均值的日变化规律进行比较分析。结果表明,棚外日平均气温均值为0. 79℃,棚内为2. 89℃,棚内为棚外的3. 65倍;9∶00-17∶00,棚内日气温最高值、最低值、平均值均高于棚外,其它时间低于棚外;外界环境温度高时,冷棚升温保温效果显著,外界环境温度低时,冷棚保温效果不明显。棚外日平均土壤湿度均值为2. 81%,棚内为25. 05%,棚内为棚外的8. 91倍;棚外日平均土壤湿度差距为1. 63个百分点,棚内为1. 19个百分点,棚内湿度变幅要小于棚外;冷棚有较好地保持土壤湿度的作用。

In the experiment,the daily change laws of the highest and lowest values of air temperature and soil moisture,the difference and average values of soil humidity and air temperature in and out the pomegranate cold shed in North China were studied in January.The results showed that the mean of daily average air temperature was 0.79℃ out side the shed and 2.89℃ in the shed as 3.65 times of the former.The maximum,minimum and average air temperature in the shed were higher than those of outside temperature from9∶00 to 17∶00,but were lower at the other time.When the ambient environmental temperature was higher,the warming and heat preservation effects of cold shed were significant.When the ambient temperature was lower,the heat preservation of cold shed was not obvious.The mean of average soil moisture was 2.81%out the shed,but was 25.05%in the shed as 8.91 times of the former.The difference of daily average humidity out the shed was 1.63 percentage points and that was 1.19 percentase points in the shed.The variation amplitude of humidity in the shed was smaller than that out the shed.The cold shed had better effect for keeping soil humidity.