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通过对位于唐古拉山北坡的D1 0 5点不同深度土壤温度时间序列的分析 ,表明各层日平均土壤温度的时间变化具有很好的年周期 ,其变化曲线为一正弦曲线。浅层土壤温度的波动比其较深层土壤温度的波动大 ,但对同一层而言 ,其波动程度尽管在夏半年略大于冬半年 ,但差别不大。地表、0 0 5m和0 2m深处 ,土壤日最高温的变化幅度要明显大于最低温的变化幅度 ;同时 ,日最高温与日最低温的变化趋势并不完全一致。积雪可能对土壤日最高温、日最低温和日温差有较大影响。地表 1a中的最大日温差可达 6 0 4℃ ( 1 998年 3月 2 7日 ) ,1a中极端日最高温可达 39 7℃ ,最低温达 -1 6 5℃。夏半年日温差明显大于冬半年 ,且日温差随深度的增加而减小 ,到 80cm深处已基本上看不到明显的日温差。
The time series of soil temperature at different depths at D1 0 5 located on the northern slope of Tanggula Mountain indicate that the temporal variation of daily average soil temperature in each layer has a good annual cycle and the variation curve is a sinusoidal curve. The fluctuation of shallow soil temperature is larger than that of its deeper soil temperature, but the fluctuation degree of shallow soil is slightly different from that of winter in the summer half year though it is slightly greater than that in winter. At the depth of 0 0 5m and 0 2m, the maximum daily temperature change of soil was obviously larger than the minimum temperature. On the other hand, the daily maximum temperature and daily minimum temperature did not change uniformly. Snow cover may have a greater impact on the maximum daily soil temperature, daily minimum temperature and daily temperature difference. The maximum daily temperature difference in surface 1a can reach 600 ℃ (March 27, 1998). The maximum temperature in extreme day 1a can reach 397 ℃ and the lowest temperature can reach -165 ℃. The temperature difference between summer and winter was obviously larger than that of winter, and the daily temperature difference decreased with the increase of depth. At 80cm depth, obvious daily temperature difference was hardly observed.