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多年冻土是一种热现象,地温是判断多年冻土特征的有效指标。通过对祁连山区东北部大通河源区多年冻土分布状况的野外考察与钻探等工作,借助于实测地温数据和地温曲线分析工具,对大通河源区39个钻孔点的多年冻土地温特征进行了对比分析,对影响多年冻土地温的主要因素进行了概括和总结。结果表明,在大通河源区,高程、植被类型、地表覆盖特征、土壤水分条件等是影响多年冻土地温的主要因素。根据尺度性划分的结果,高程是影响区域多年冻土地温变化的一级因素;随着空间尺度的下降,植被类型和地表覆盖特征成为二级影响因素;在沼泽化草甸植被覆盖区,土壤水分条件又成为影响多年冻土地温的三级影响因素。对多年冻土地温特征及影响因素的分析不仅有助于了解区域多年冻土的稳定性、预测全球气候变暖背景下的多年冻土演变和退化,还可以为寒区气候变化、生态、水文等相关领域的发展提供基础,为各项工程设施的实施和维护提供建议和指导。
Permafrost is a kind of hot phenomenon, and the ground temperature is an effective indicator to judge the characteristics of permafrost. Through the field investigation and drilling of the permafrost distribution in the Datong Heyuan area in the northeastern Qilian Mountains, the geothermal characteristics of permafrost at 39 drilling sites in the Datong Heyuan area were studied with the help of the measured geothermal data and the geothermal curve analysis tools Through comparative analysis, the main factors affecting the ground temperature of permafrost are summarized and summarized. The results show that in the Datong Heyuan area, elevation, vegetation types, land cover characteristics and soil moisture conditions are the main factors that affect the ground temperature in permafrost. According to the results of scale division, elevation is the first-order factor that affects the ground temperature change of permafrost. As the spatial scale declines, the vegetation type and surface coverage become the second-order influencing factors. In the marsh meadow vegetation coverage area, Moisture conditions have become the third-order influencing factors of the soil temperature in permafrost. The analysis of geothermal characteristics and influencing factors of permafrost not only helps to understand the stability of permafrost in the region, predict the evolution and degradation of permafrost in the context of global warming, but also contributes to climate change, ecology, hydrology And other related fields to provide the basis for the implementation of various engineering facilities and maintenance advice and guidance.