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利用2003年10月～2004年9月期间高原北部可可西里(QT01)、北麓河(QT02)、开心岭(QT05)、通天河(QT06)等地活动层土壤温度梯度、土壤热通量及土壤水分的观测资料,计算了高原北部活动层土壤的导热率、土壤容积热容量、导温率等土壤热力参数.结果显示,QT02、QT05、QT06三站导热率、导温率夏秋季节较大而冬季较小,容积热容量则相反,表现为秋冬季节大而夏季较小;QT01站导热率表现为春季大,夏季较小;表层土壤粒度较小及较低的土壤湿度是冬季导热率较小的可能原因;冻土的热力特征参量可描述为相应深度的温度、体积含冰量及土壤盐度的函数,土壤含水量是融土热特征参数的主要影响因子;土壤水分含量小于某一临界值时,导温率随土壤水分含量的增大而增大,反之则减小.
The soil temperature gradient, the soil heat flux and the soil temperature of the active layer in the northern plateau such as Hoh Xil (QT01), QT02, QT05 and QT06 were measured from October 2003 to September 2004. The results showed that the thermal conductivity of the three stations QT02, QT05 and QT06 were larger in summer and autumn than in winter, and the thermal conductivity of soil in the active layer in the northern plateau was calculated. The smaller the volumetric heat capacity is, the larger the autumn and winter seasons are and the smaller is the summer. The thermal conductivity of QT01 is larger in spring and smaller in summer. The smaller surface soil size and lower soil moisture are likely to have smaller thermal conductivity in winter The reason is that the thermal characteristic parameters of frozen soil can be described as the function of corresponding depth, ice volume and soil salinity, and the soil water content is the main factor affecting the soil thermal characteristics. When the soil moisture content is less than a certain critical value , The thermal conductivity rate increases with the increase of soil moisture content, otherwise decreases.