中文摘要：

为研究季节性冻土区在积雪覆盖条件下,土壤温度变化趋势及气象因素对土壤热状况的影响,以野外实测试验数据（2013年11月8日—2014年4月28日）为基础,分析裸地、自然降雪、积雪压实和积雪加厚覆盖条件下5、10、20、40、60、100、140 cm深度土壤温度变化特征,采用灰色关联度分析的方法筛选出影响土壤热状况的主要气象因素,进而统计土壤温度与气象因素之间的相关关系。结果表明：积雪的存在阻碍了环境与土壤之间的能量交换,引起土壤温度和土壤冻融过程的差异;随着积雪覆盖深度的增加,土壤的冻融日期会出现延迟现象,土壤温度相对稳定在较高水平,并且地、气之间温差增大;冻融过程中土壤温度变化的主要影响因素为环境温度,积雪覆盖使得气象因素与土壤温度的关联度减弱。

英文摘要：

This paper discovers the soil temperature and meteorological factors＇ impact on soil thermal status in seasonal frozen under the condition of snow cover. We measured the soil temperature in the depth of 5,10,20,40,60,100,140 cm under the condition of bare land,nature snow cover,snow compressed and snow thickened. Based on field experimental data,grey correlation analysis was used to select the main meteorological factors affecting the soil thermal conditions and then we calculated the correlation between soil temperature and meteorological factors. Results shows that the existence of snow hampers the energy exchange between soil and environment,causes the difference between the soil temperature and freezed-thawing process,and with the increase of depth of the snow cover,soil freezing and thawing date will be delayed, the soil temperature will be relatively stable at a high level.Meanwhile,the difference of temperature between soil and atmosphere will enlarge. In the process of freezing and thawing,environment temperature is the main controlling factor of soil temperature; snow cover makes the correlation between meteorological factors and soil temperature weaker.