黄河源区不同降雪年土壤冻融过程及其水热分布对比分析

发布时间：2018-05-17 04:00

  本文选题：积雪 + 冻融过程　； 参考：《干旱区研究》2017年04期

【摘要】：利用黄河源区鄂陵湖西侧野外观测站一个多雪年和一个少雪年的数据,对多雪年和少雪年土壤冻融过程及水热分布进行了对比分析。结果表明:黄河源区多雪年积雪集中时段1—3月气温明显偏低,分别比少雪年低3.04℃、3.15℃、3.58℃。多雪年1—3月地气间热交换明显弱于少雪年,且多雪年土壤由热源转为热汇的时间晚于少雪年。多雪年1月土壤净输出的热量少于少雪年1月,多雪年2—3月土壤净输出的热量多于少雪年2—3月,导致多雪年1月土壤温度高于少雪年各土层,而2—3月土壤温度明显低于少雪年,且多雪年1—3月土壤升温速度慢于少雪年,使得多雪年5~40 cm各土层土壤消融初日比少雪年分别晚24 d、23 d、11 d和12 d,从而导致多雪年土壤湿度增加晚于少雪年。
[Abstract]:Based on the data of one snow year and one less snow year at the field observation station on the west side of Eling Lake in the source region of the Yellow River, the freezing and thawing process and the distribution of water and heat of the soil in the years of more snow and less snow were compared and analyzed. The results show that the temperature in January and January is obviously lower than that in less snow year in the source region of Yellow River, which is 3.04 鈩，

本文编号：1899793