《Table 2 Analysis of soil temperature differences in different soil depths》

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《西藏那曲地区土壤温度变化特征及其与环境关系研究》

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The trend in different layers of soil temperature was similarly （Figure 1）.The total fluctuation of soil temperature was similar to the periodic change of sine or cosine，it was high in summer，low in winter，and the amplitude was about 11.3°C.The temperature difference in soil layers changed a little and the volatility was low from April to October.However，the fluctuation of all soil layers was severe from October to March of the next year，especially the soil surface，but the fluctuation would decrease with the increase of soil depth.The soil temperature changed suddenly in October，dropping rapidly by about 14°C，becoming the month with the greatest variation.From April，the temperature was above 0°C and the soil began to thaw.