高寒地区日光温室地温变化及预报

利用2012年4月至2013年3月青海大通县日光温室内外地温、气温资料和大通县气象站人工观测资料,分析了高寒冷凉地区不同天气类型下日光温室地温变化规律。结果表明;研究区日光温室内日地温呈正弦曲线变化,晴天变化幅度最明显,阴天最小,地温变幅为地表〉5 cm〉10 cm〉15cm〉20 cm;室内地表、10 cm和20 cm平均地温月变化呈波形变化,最大值出现在7月,最小值在12月;随着深度增加,平均地温年较差逐渐减小;晴天、多云天、阴天不同深度地温平均日较差分别为9.6、8.3、6.1℃;地温日垂直变化仅在14时随着深度增加逐渐下降;除晴天室内最高温度外,其余温度要素与地温之间存在极显著正相关关系;建立的日光温室内10 cm最低温度预报方程和地表最低温度预报模型,可以在业务服务中应用。

Ground Temperature Variation and Its Forecast in the Daylight Greenhouse in Datong of Qinghai

Based on the temperature data inside and outside the daylight greenhouse and meteorological observation data from April 2012 to March 2013 in Datong County of Qinghai Province,the variation of the ground temperature in the daylight greenhouse under different weather conditions in high and cold region was analyzed.The results show that the average ground temperature in the daylight greenhouse presented sinusoidal change,the changing magnitude was obvious on sunny days and smallest on cloudy days.Average monthly variation of ground temperature of 0 cm,10 cm and 20 cm inside the daylight greenhouse showed waveform change,the maximum in July and minimum in December,and as the depth increased,the average annual range of ground temperature decreased.Average daily range of ground temperature at different depths on sunny,cloudy,overcast days was 9.6,8.3 and 6.1 ℃,respectively.The vertical variation of ground temperature declined at 14：00 with depth increase.In additional,the forecast equations of 0 cm and 10 cm minimum temperature inside the daylight greenhouse established could be applied in meteorological services.