Studies on the Soil Freezing and Thawing in Hingan Ling : 1. The existing circumstance of permafrost in Hingan Ling

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  • 中国東北部興安嶺地域における凍土研究(1) : 興安嶺地域における永久凍土の分布概況
  • チュウゴク トウホクブ コウアンレイ チイキ ニ オケル トウド ケンキュウ

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Abstract

In this paper, the existing circumstances of permafrost and seasonally frozen ground in Hingan Ling is reported. 1. Hingan Ling belongs to the transition zone between the circumpolar permafrost area and the seasonally frozen ground area. It is well known that in this kind of transition zone the soil freezing and thawing penetrates extremly under the ground. 2. In winter, it is terribly cold in Hingan Ling where a very influential and cold Siberian air mass covers over. But it becomes comparatively hot because Hingan Ling is situated in relatively low latitude and sent a warm seasonal wind from a Pacific high. So, Hingan Ling shows the from 1, 000 to 1, 500℃･Day larger freezing index than another same latitudes and the greater depths of soil freezing and thawing penetration than another parts of the trasition zone. 3. According to the distribution of permafrost Hingan Ling is classified the four divisions of continuous permafrost, uncontinuous permafrost, scattered permafrost and seasonally frozen ground. It is the chief distinction in Hingan Ling that scattered permafrost ranges very wide.

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