《Table 3 Correlation coefficients of meteorological factors and soil temperature》

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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 results showed that soil temperature in alpine and high-altitude areas had a similar periodic trend of sine and cosine，with a maximum amplitude of 15.7oC，which is consistent with the results on soil temperature variation trends in other regions of China[15-18]，but slightly different in oscillation period and amplitude.Qi et al.[19]monitored 22stations on the Changtang Plateau，and compared with this paper，the difference in diurnal and monthly changes was 1.2-1.6oC.The differences may be caused by different time scales of data monitoring，differences in latitude and longitude or surface vegetation[20].In January，April，July and October，the soil temperature showed a law of large difference in winter and small difference in summer，the main reason is that the sunshine duration is longer in summer than in winter in Nagqu region，and the energy received by the soil is different.In addition，the soil type is alpine meadow，with more gravel under the soil，and the specific heat capacity of the soil is small，leading to a large change in the day-night temperature.On the spatial scale，the mean temperature of each layer in soil showed a tendency of increasing first and then decreasing with increasing soil depth.In four special months，the temperature amplitude of different soil layers decreased with the increase of depth，and the lag time of peak-valley variation become longer with the increase of depth，the lag time increased by about 1 h for every 10 cm increase of depth.