青海深层地温的变化特征及对气候变化的影响

利用1981～2010年青海8个观测站0.8、1.6、3.2 m地层的逐月平均地温资料,采用气候统计诊断分析方法,对近30年青海年、季平均地温的气候变化趋势及突变特点进行研究。结果表明,近30年青海0.8、1.6、3.2 m地层年平均地温均呈上升趋势,升幅最大值为0.62～0.69℃/10a;各层均以玛多升幅最大;近30年大部分站四季平均深层地温均呈上升趋势,夏季升幅最大,冬季最小;年、季深层地温突变时间绝大部分站点发生在20世纪90年代中后期;各地层年平均升温幅度随着深度的增加而减小;年平均气温与各深层地温均为正相关;降水与深层地温的相关性不明显;冻土深度与各深层地温均为负相关。研究结果对合理利用气候资源、调整农作物种植并合理安排农业生产布局具有参考价值。

The Variation Characteristics of Deep Soil Temperature in Qinghai Province and Its Influence on Climate Change

Based on the monthly mean soil temperature data of 0.8,1.6,3.2 from 8 observation stations of Qinghai Province during 1981-2010,the climate variation trend and mutation characteristics of annual and seasonal mean soil temperature were studied by using climatic statistical diagnosis analysis method.The results showed that the annual average soil temperature of 0.8,1.6,3.2 m reflects an upward trend;the maximum increase was found in Maduo with 0.62-0.69 ℃/10a;the average seasonal deep soil temperature in recent 30 years showed an rising trend;the maximum increase was found in summer while minimum in winter.Annual and seasonal deep soil temperature mutation time mainly occurred in the middle and later 1990s'.The annual average soil temperature of each layer increased with depth decreased;the annual average temperature was positively correlated with deep soil temperature;the correlation between precipitation and deep soil temperature was not obvious;frozen soil depth was negatively correlated with deep soil temperature.The results have reference value on appropriate utilizing climate resource,adjusting agricultural crops planting,arranging agriculture production layout.