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青藏高原上发育着世界上独一无二的沙漠和冻土,然而,沙漠化对冻土地温产生的影响目前仍不清楚.近年来,随着青藏高原沙漠化的发展,这个问题愈加令人担忧.为此,作者在青藏高原红梁河建立观测实验场,利用热敏电阻地温探头,通过野外同步对比观测方法,于2010年5月～2011年4月对不同厚度沙层下的冻土地温进行了1个完整年的观测研究.发现沙层对下伏多年冻土有保护作用,表现为厚沙层下地温在多年冻土上限附近以下深度全年均低于天然地表,降温幅度大约稳定在0.2℃,夏半年5～9月最大处降温分别达3.40,3.72,4.85,3.16和1.88℃;薄沙层下地温在上限附近全年都低于相应的天然地表,最大处降温幅度全年平均达0.71℃.其初步结论不仅对探索青藏高原沙漠与冻土之间的关系具有科学意义,而且为青藏高原工程建设地区的冻土保护提供了一种新思路.
However, the impact of desertification on the ground temperature in frozen soil is still unclear. In recent years, with the development of desertification in the Tibetan Plateau, the issue is even more worrying.Therefore, The author set up an observational experiment field in Honglianghe of the Qinghai-Tibet Plateau. By using thermosensitive geothermal probe, through field synchronous comparison observation, from May 2010 to April 2011, the ground temperature of permafrost under different thickness sand layers was 1 During the whole year of observation and study, we found that the sand layer has a protective effect on the underlying permafrost. The results show that the depth below the upper limit of the permafrost in the thick sand layer is lower than the natural surface all year round, and the temperature drop rate is about 0.2 ℃, The maximum temperature in May-September in summer half year reached 3.40, 3.72, 3.85, 3.16 and 1.88 ℃ respectively. The ground temperature below the upper limit of the thin sand layer was lower than the corresponding natural surface all year, and the maximum temperature drop reached 0.71 ℃ The preliminary conclusions not only have scientific significance for exploring the relationship between desert and frozen soil in the Qinghai - Tibet Plateau, but also provide a new idea for the permafrost protection in the construction area of Qinghai - Tibet Plateau.