【摘要】 <正>任何一张冻土图都是冻土研究中大量实际资料的高度概况,也是冻土学研究水平的具体反映。同时,不同比例尺和不同类型的冻土图对生产建设具有不同程度的指导意义。正因为冻土图的编制具有如此重要的理论意义和实用价值,所以长期以来,国内外的冻土工作者都十分重视这项工作。更多还原

【Abstract】 In this paper, the principle of mapping, the method of compilation and the accuracy of the distribution map of frozen ground in China at 1:4,000,000 are discussed. Based on the analysis of formation and conservation conditions of frozen ground, we have given values of annual mean air temperature for dividing the limits of continuous permafrost, discontinuous permafrost and seasonally frozen ground. According to regressive analysis, we have established regressive equations of the annual mean air temperature in response to different latitudes and altitudes so that the horizontal distribution of different types of frozen ground mentioned above can be fixed into the terrian map of 1:1,500,000 by using the values of latitude and altitude. Then, the distribution map of frozen ground in China at 1 : 4,000,000 can be drawn. The calculated errors of the altitude of the lower limit of permafrost,compared with the data of field investigation,are generally in the range of 250-500m and the boundaries of horizontal distribution of permafrost between the results obtained by the calculation discussed above and those by field exploration are nearly the same.更多还原