内蒙古大兴安岭不同下垫面浅层地温的变化特征及其对气温的响应

Variation Characteristics of Shallow Soil Temperature on Different Underlying Surfaces and Its Response to Air Temperature in the Greater Khingan Mountains of Inner Mongolia of Inner Mongolia

基于鄂温克自治旗站和图里河站2005—2022年的实测地温和气温资料,采用线性倾向估计、Mann-Kendall检验等方法,系统分析该地区地温的时间演变规律及对气温变化的响应。结果表明:草原区和林区的各年平均气温均低于同时期的各层地温。草原区和林区的地温均随土层的加深而降低。林区年浅层地温气候倾向率大于草原区的年浅层地温气候倾向率。草原区春季气温变化对其年气温变化有显著影响;林区春、冬两季的0~20 cm浅层地温变化对年浅层地温变化有较大贡献;春、夏两季,草原区和林区浅层地温变化均与气温变化有较强的相关性。冬季,两站浅层地温变化对气温变化均不敏感,这可能是由于地表受到不同程度积雪覆盖的影响。草原区年平均浅层地温变化与气温变化的相关关系不明显,林区0~20 cm年浅层地温变化与气温变化呈较强的相关性。

Based on the shallow soil temperature and air temperature observation data of Ewenki and Tulihe station from 2005 to 2022,the temporal evolution characteristics of shallow soil temperature and its response to air temperature in these area were systematically analyzed by using linear tendency estimation and Mann-Kendall test.The results showed that the annual average air temperature was lower than the soil temperature of each layer in both grassland and forest areas.The deeper the soil depth in grassland area and forest area,the lower the soil temperature.The climatic tendency rate of annual shallow soil temperature in forest area was greater than that in grassland area.The spring air temperature variation had a significant influence on the annual air temperature variation in the grassland area.In the forest area,the shallow soil temperature variation of 0~20 cm depth in spring and winter had a great contribution to the annual shallow soil temperature variation.In spring and summer,there was a strong correlation between the shallow ground temperature variation and the air temperature variation in grassland area and forest area.In winter,the shallow soil temperatures of two stations were not sensitive to air temperature change,which may be due to the influence of different degrees of snow cover.The correlation between annual mean shallow soil temperature change and air temperature change in grassland was not obvious,and the shallow soil temperature variation of 0~20 cm depth had a strong correlation with air temperature variation in forest region.