霜冻天气条件下浅层土壤温度变化特征分析

选择江苏海安市为研究对象,研究春、冬季浅层土壤温度的变化规律及在发生霜冻情况下土壤温度的动态变化特征。结果表明,从季节变化来看,近地层土壤温度变化趋势与气温一致,变化幅度没有气温剧烈,土层越深,土壤温度变化趋势越来越平缓;各层土温日内变化均呈现正弦曲线状态,其中地表温度的变幅较大,且出现极值的时间比20 cm土层出现极值的时间早4 h左右;春季地气间热量交换比冬季大,极易发生晚霜冻。

Analysis on Change Characteristics of Shallow Soil Temperature under Frost Weather

Hai’an City was chosen as the research object to study the change law of shallow soil temperature in spring and winter and the dynamic change characteristics of the soil temperature under the occurrence of frost.The results showed that from the perspective of seasonal change,the change trend of soil temperature in the near ground layer was the same as that in the air temperature,the change range was not violent,the deeper the soil layer was,the more gentle the trend of soil temperature change was.The diurnal variation of soil temperature in each layer presented a sine curve state,in which the variation amplitude of surface temperature was large,and the time of extreme value was about 4 hours earlier than that of 20 cm soil layer.The heat exchange between the air and the earth in spring was larger than that in winter,and late frost was very easy to occur in spring.